WO2018033965A1 - Lower leg behavior analysis system and analysis method, and lower leg behavior evaluation system and evaluation method - Google Patents

Abstract

The present invention provides: a lower leg behavior analysis system and analysis method for analyzing the behavior of the lower leg, including the crus and foot, during the stance phase on the basis of relative angle information indicating the inward/outward cant of the heel with respect to the crus during the stance phase, and inclination angle information indicating the inward/outward cant of the heel with respect to the ground; a lower leg behavior evaluation system using said analysis system; and a lower leg behavior evaluation method using said analysis method.

Description

Lower leg behavior analysis system and analysis method, lower leg behavior evaluation system and evaluation method

The present invention relates to an analysis system and analysis method for the behavior of the lower leg, an evaluation system and an evaluation method for the behavior of the lower leg.

In recent years, a service has been provided that analyzes the behavior of the lower leg including the lower leg and legs during the stance phase while running or walking and provides customers with products such as shoes suitable for the behavior of the lower leg.

When such a service is performed, for example, a shoe selection system (hereinafter referred to as a selection system) that evaluates the result of analyzing the behavior of the lower leg of the customer and selects shoes suitable for the evaluation is used. (For example, refer to Patent Document 1).

Such a selection system derives the angle formed by the centerline of the calf and the centerline of the heel as an inclination angle of the ankle from an image obtained by photographing a customer during traveling, and evaluates the behavior of the ankle based on the inclination angle. And a shoe selection means for selecting a shoe suitable for the evaluation of the inclination angle determination means.

According to the selection system, since a shoe suitable for the evaluation of the inclination angle of the ankle, which is the analysis result of the behavior of the lower leg, is selected, it is possible to provide the customer with a shoe suitable for the behavior of the ankle. It is supposed to be possible.

Japanese Patent No. 4856427

By the way, since there are many joints in the lower leg of the human body (especially the foot), the actual behavior of the lower leg during running and walking is complicated. The behavior of the lower leg is analyzed based only on the angle formed by the centerline of the leg.

In other words, since the above selection system analyzes only the behavior related to the inclination angle among the behavior of the lower leg, the accuracy of the analysis result is lacking, and accordingly, the accuracy of the evaluation based on the analysis result is also low. It has become.

Therefore, in view of such circumstances, the present invention provides an analysis system and analysis method for the lower leg behavior that can accurately analyze the lower leg behavior, an evaluation system for the lower leg behavior and an evaluation method that can accurately evaluate the lower leg behavior. It is an object to provide a method.

The analysis system for the behavior of the lower leg of the present invention is as follows.
With an analyzer that analyzes the behavior of the lower leg, including the lower leg and legs during the stance phase,
The analyzer has a processing unit for deriving analysis information quantitatively representing the behavior of the lower leg portion,
The processing unit derives relative angle information representing the inclination of the heel relative to the lower leg and inclination angle information representing the inclination of the heel relative to the ground of the foot based on the behavior of the lower leg, and the relative angle information And the analysis information based on the tilt angle information.

In the analysis system of the behavior of the lower leg of the present invention,
The processor is
The analysis information may be derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as components.

In this case, the processing unit
The analysis information may be derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components.

In the analysis system of the behavior of the lower leg of the present invention,
The processor is
Deriving twist angle information representing the twist degree of the lower leg with respect to the heel from the behavior of the lower leg,
Tilt information which is information derived based on the relative angle information and the tilt angle information, and twist which is information derived based on the relative angle information, the tilt angle information and the twist angle information. Information and
The analysis information may be derived based on the tilt information and the twist information.

In this case, the processing unit
Deriving the tilt information on an orthogonal coordinate system having the relative angle information and the tilt angle information as components,
The twist information may be derived on an orthogonal coordinate system having the relative angle information, the tilt angle information, and the twist angle information as components.

Furthermore, the processing unit includes:
Deriving the tilt information on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components,
The twist information may be derived on an orthogonal coordinate system having the relative angle information, the tilt angle information, and the twist angle information as vector components.

In the analysis system of the behavior of the lower leg of the present invention,
The processor is
Determine the type of how to put the foot on the ground during the running of the subject to be analyzed for the behavior of the lower leg,
The relative angle information and the tilt angle information may be derived based on information in a section set in the stance phase according to a determination result of the type of how to put on the foot.

In this case, the processing unit
The manner in which the subject reaches his / her feet during running is either a heel-contact where the heel first touches the ground in the stance phase, or a flat-ground where the entire back side of the foot lands on the ground substantially simultaneously in the stance phase. When it is determined that there is, the start time of the subject's stance phase is set as the start time of the interval, and the time when 55 to 65% of the entire stance phase has elapsed is set as the end position of the interval. It may be configured as follows.

In addition, the processing unit
How to get the feet while the subject is running,
In the stance phase, when it is first determined that the toes are grounded on the ground,
The time when 3 to 10% of the entire stance phase has elapsed is set as the start time of the section, and the time when 55 to 65% of the entire stance phase has elapsed is set as the end position of the section. It may be configured to.

In the analysis system of the behavior of the lower leg of the present invention,
The processor is
The type of how to put on the foot may be determined based on the angle of the heel in the sagittal plane with respect to the ground when the subject is standing still.

The analysis system for the behavior of the lower leg of the present invention is as follows.
A mat for aligning the direction of the lower leg when the subject takes a standing posture;
On the mat, two reference lines that are straight lines parallel to each other, and two reference lines that serve as a reference for aligning the direction of the foot when the subject is standing still are drawn,
The processor is
The type of how to put on the foot may be determined based on the angle of the eyelid in the sagittal plane with respect to the ground of the subject who has taken a stationary posture with the feet aligned with the reference line. .

The method for analyzing the behavior of the lower leg of the present invention is as follows.
An analysis process for analyzing the behavior of the lower leg including the lower leg and legs during the stance phase,
In the analysis process,
Based on the behavior of the lower leg, derive relative angle information indicating the degree of inversion of the heel with respect to the lower leg, and tilt angle information indicating the degree of inclination of the heel with respect to the ground of the foot,
Based on the relative angle information and the tilt angle information, analysis information that is information that quantitatively represents the behavior of the lower leg portion is derived.

In the method for analyzing the behavior of the lower leg of the present invention,
In the analysis step,
The analysis information may be derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as components.

In this case, in the analysis step,
The analysis information may be derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components.

In the method for analyzing the behavior of the lower leg of the present invention,
In the analysis step,
Deriving twist angle information representing the twist degree of the lower leg with respect to the heel from the behavior of the lower leg,
Tilt information which is information derived based on the relative angle information and the tilt angle information, and twist which is information derived based on the relative angle information, the tilt angle information and the twist angle information. Information and
The analysis information may be derived based on the tilt information and the twist information.

The evaluation system for the behavior of the lower leg of the present invention is as follows.
Observing the lower leg including the lower leg and leg in the stance phase and obtaining observation information that is information on the posture of the lower leg, and analyzing information analyzing the behavior of the lower leg based on the observation information And a processing device that executes a process of evaluating the behavior of the lower leg based on the analysis information,
The processor is
Based on the observation information, relative angle information indicating the degree of inversion of the heel with respect to the lower leg, tilt angle information indicating the degree of inversion of the heel with respect to the ground of the foot, and the angle of the lower leg with respect to the heel A pre-processing unit for deriving behavior information including twist angle information representing a degree of twist;
Tilt information, which is quantitative information derived based on the relative angle information and the tilt angle information, or quantitative information derived based on the relative angle information, the tilt angle information, and the twist angle information. An analysis unit for deriving the analysis information composed of any of the twist information;
An evaluation unit that evaluates the behavior of the lower leg based on the analysis information.

In the evaluation system for the behavior of the lower leg of the present invention,
In the processing device, an evaluation reference value that is a reference value for comparison with the tilt information is stored in advance.
The analysis unit is configured to execute a process of determining which information of the tilt information and the twist information is used as the analysis information based on a comparison result between the tilt information and the evaluation reference value. May be.

The method for evaluating the behavior of the lower leg of the present invention is as follows.
A preparatory step of observing the lower leg including the lower leg and the leg in the stance phase, and obtaining observation information that is information on the posture of the lower leg;
Based on the observation information, relative angle information indicating the degree of inversion of the heel with respect to the lower leg, tilt angle information indicating the degree of inversion of the heel with respect to the ground of the foot, and the angle of the lower leg with respect to the heel A pre-processing step for deriving behavior information including twist angle information representing a degree of twist;
Tilt information, which is quantitative information derived based on the relative angle information and the tilt angle information, or quantitative information derived based on the relative angle information, the tilt angle information, and the twist angle information. An analysis process for deriving analysis information consisting of any of the twist information;
An evaluation step for evaluating the behavior of the lower leg based on the analysis information.

FIG. 1 is a schematic diagram of a system for evaluating the behavior of a lower leg according to an embodiment of the present invention. FIG. 2 is a block diagram of the leg lowering behavior evaluation system according to the embodiment. FIG. 3 is an explanatory diagram of the measuring instrument of the lower leg behavior evaluation system according to the embodiment, and is a view of the measuring instrument viewed from the back side of the subject. FIG. 4 is a plan view of a mat that is an auxiliary instrument of the lower leg behavior evaluation system according to the embodiment. FIG. 5 is an explanatory diagram of a ground contact angle that is an angle of the foot with respect to the ground. FIG. 6A is an explanatory diagram of a reference for measuring the contact angle. FIG. 6B is an explanatory diagram of a method for deriving contact angle information according to the embodiment. FIG. 7A is a schematic diagram illustrating a type of foot attachment according to the embodiment, and is a schematic diagram illustrating heel contact. FIG. 7B is a schematic diagram illustrating a type of foot attachment according to the embodiment, and is a schematic diagram illustrating flat grounding. FIG. 7C is a schematic diagram showing types of how to put on the foot according to the embodiment, and is a schematic diagram showing toe grounding. FIG. 8 is an explanatory diagram of analysis information of the leg lowering behavior evaluation system according to the embodiment. FIG. 9 is an explanatory diagram of a state in which the evaluation result of the evaluation system for the behavior of the lower leg according to the embodiment is output. FIG. 10 is a flowchart of the pronation analysis method and the evaluation method of the pronation analysis result by the leg lower leg behavior evaluation system according to the embodiment. FIG. 11 is a sub-flowchart showing a specific process for deriving behavior information in the analysis section shown in FIG. 10, and is a flowchart of a process for deriving behavior information. FIG. 12 is a sub-flowchart showing specific processing of the pronation analysis shown in FIG. FIG. 13 is a sub-flowchart showing a specific process for evaluating the analysis result of the pronation shown in FIG. FIG. 14 is an explanatory diagram of relative angle information and tilt angle information of the lower leg behavior evaluation system according to the embodiment. FIG. 15 is an explanatory diagram of twist angle information of the lower leg behavior evaluation system according to the embodiment. FIG. 16 is a diagram showing experimental results of Experimental Example 2 of the present invention.

Hereinafter, an evaluation system (hereinafter referred to as an evaluation system) for behavior of a lower leg according to an embodiment of the present invention will be described with reference to the accompanying drawings. The evaluation system according to the present embodiment is a system that analyzes the combined behavior of the heel and the lower leg of the supporting leg in the stance phase during running or walking and evaluates the analysis result of the combined behavior.

The lower leg portion is a portion including the lower leg and the foot in the entire lower limb. In this embodiment, as shown in FIG. 14 and FIG. 15, “L” is attached to the lower leg, “F _u ” is attached to the lower leg, and “F _f ” is attached to the foot. , “F _n ” is attached to the ankle, “F _h ” is attached to the heel of the foot F _f , and “F _t ” is attached to the toe. Further, in this embodiment, inward fall against lower leg F _u of inward falling and heel F _h of the heel F _h of the support leg in the stance phase or walking running (in the subtalar times), the lower leg F _{u (tibia} it complex behavior of internal rotation (heel including torsion) to the inside of the shin F _h and lower leg F _u for heel F _h is called a pronation of) the following description. In the following description, the behavior of the lower leg L during traveling (running state) will be described, but these explanations also apply during walking (walking state).

As shown in FIG. 1, the evaluation system includes an observation device 2 that acquires observation information obtained by observing the posture of the lower leg L in a stationary standing state or a running state of a subject who analyzes and evaluates a pronation, and the observation A processing device 3 for analyzing the pronation based on the information and evaluating the analysis result of the pronation, and a display device 4 for displaying the evaluation result of the pronation by the processing device 3 are provided. In the present embodiment, the processing device 3 and the display device 4 are integrated.

The observation device 2 includes a photographing device 20 that captures a subject in a stationary standing state or a traveling state, and a measuring instrument that measures information representing the posture (orientation) of the lower leg L of the subject in a stationary standing state or the traveling state. 21 and an auxiliary instrument 22 that assists the observation of the subject.

The photographing device 20 is configured to output a still image obtained by photographing a subject in a still standing state from the back side to the processing device 3. In addition, the photographing device 20 is configured to be able to output to the processing device 3 a moving image in which a subject in a running state is photographed from the back side at a predetermined frame rate. The frame rate is set to 60 frames / second or more, for example. Each frame of the moving image shot by the shooting device 20 visually represents the posture of the lower leg L of the subject at each point in the shooting period. The imaging device 20 is, for example, a video camera, and can perform wired communication or wireless communication with the processing device 3.

Measurement instrument 21 is configured to be attached to the lower leg L of the subject, the orientation in the three-dimensional heel F _h and lower leg F _u configured to obtain quantifiable information quantitatively represents Yes.

The observation device 2 according to the present embodiment is configured to obtain quantification information at the time of photographing by outputting observation information obtained by photographing the measuring instrument 21 with the photographing device 20 to the processing device 3. Has been.

Therefore, the quantification information at the time of shooting is associated with the still image of the subject photographed by the photographing device 20, and the moving image of the subject photographed by the photographing device 20 corresponds to each frame. Quantification information at the point of time is associated.

As shown in FIG. 3, the measuring instrument 21 according to the present embodiment includes a plurality of (four in FIG. 3) markers 210 attached to the lower leg L of the subject. The plurality of markers 210, a pair of markers attached to the heel F _h of the right and left of the subject (hereinafter, the lower as a marker) and 210, a pair of markers attached to the upper ankle F _n of the left and right of the subject (hereinafter, 210) (referred to as an upper marker).

Therefore, in the present embodiment, the observation information obtained by photographing the upper marker 210 and the lower marker 210 by the photographing device 20 is output to the processing device 3, thereby acquiring the three-dimensional orientation as quantification information. Can do.

The marker 210 is, for example, an AR (Augmented Reality) marker. Then, in the still image or moving image obtained by photographing the marker 210 with the photographing device 20, virtual three-direction axes are projected on the marker 210. The three-dimensional orientation is represented by, for example, three axes: a vertical axis corresponding to the vertical direction, a depth axis corresponding to the subject's running direction or walking direction, a vertical axis and a left-right axis orthogonal to the depth axis. Direction.

In the present embodiment, the marker 210 is attached in a state where the subject is barefoot (see FIG. 3), and the photographing by the photographing apparatus 20 is also performed in a barefoot state. Further, in order to attach the upper marker 210 and the lower marker 210 to the lower leg L of the subject, for example, the upper marker 210 and the lower marker 210 are directly attached to the lower leg L of the subject with an adhesive or the like, It may be attached to the lower leg L of the subject using a band or the like.

As shown in FIG. 4, the auxiliary device 22 includes a mat 220 for aligning the direction of the lower leg L when the subject takes a standing posture, and the subject runs at a predetermined position. A treadmill 221 (see FIG. 1) for continuing.

The mat 220 is an instrument used when acquiring offset information described later from the lower leg L of the subject in a stationary standing state.

On the surface of the mat 220, a foot placement area 220a indicating a position where the foot F _f is placed and a reference line 220b which is a straight line passing through the foot placement area 220a are drawn.

In the foot placement area 220a, a foot placement area (hereinafter referred to as a left foot placement area) 220a on which the subject's left foot F _f is placed and a foot placement area (hereinafter referred to as a right foot placement area) on which the subject's right foot F _f is placed. 220a, which are drawn so as to be arranged at predetermined intervals in the lateral direction (width direction) of the mat 220, respectively. The distance between the left foot depositing area 220a and the right foot depositing area 220a, the spacing of the feet F _f is set to be about shoulder width when the subject is placed both feet F _f foot depositing area 220a .

In the present embodiment, a plurality of left footrest areas 220a having different sizes are drawn on the surface of the mat 220 so as to be a group, and a plurality of right footrest areas 220a having different sizes are a group. Are drawn on the surface of the mat 220.

Two reference lines 220b are drawn on the surface of the mat 220 according to the present embodiment. One reference line 220b is as connecting the vertex of the vertex and the heel F _h side of the toe F _t side of the left foot depositing area 220a are drawn in a straight line, the other reference line 220b is right foot location depicted in a linear shape so as to connecting the vertex of the vertex and the heel F _h side of the toe F _t-side region 220a.

The pair of reference lines 220b extend straight along the longitudinal direction of the mat 220 (vertical direction in FIG. 4) so as to be substantially parallel to each other. The reference line 220b is subject is a straight line used as a reference for aligning the orientation of the foot F _f topped foot depositing area 220a.

The mat 220 is disposed in front of the photographing apparatus 20 in a state where the vertical direction (direction in which the reference line 220b extends) corresponds to the optical axis direction of the photographing apparatus 20. Therefore, when the subject puts the foot F _f in the footrest region 220a and further gets on the mat 220 so that the direction of the foot F _f is aligned with the direction along the reference line 220b, the subject's heel F _h , a state in which the calf (behind the lower leg F _u) is directed straight to photographing apparatus 20.

The treadmill 221 is disposed in front of the photographing apparatus 20. Further, the treadmill 221 is arranged so that the subject turns his back to the photographing apparatus 20 and can perform a traveling operation while being peeled in a direction corresponding to the optical axis direction of the photographing apparatus 20.

The processing device 3 analyzes the pronation and evaluates the analysis result of the pronation. That is, the processing device 3 is an analysis device that analyzes a pronation, and is also an evaluation device that evaluates the analysis result of the pronation.

As illustrated in FIG. 2, the processing device 3 includes a processing unit 30 that analyzes the pronation and evaluates the result of the pronation based on the observation information transmitted from the observation device 2.

The processing unit 30 derives behavior information that quantitatively represents the behavior of each part of the lower leg L based on the observation information transmitted from the observation device 2, and the preprocessing unit 31 The analysis unit 32 analyzes the pronation based on the derived behavior information, and the evaluation unit 33 evaluates the analysis result of the pronation by the analysis unit 32.

The pre-processing unit 31 determines a section (hereinafter referred to as a designated section) to be used for analyzing a pronation with respect to a moving image (moving image associated with quantification information) transmitted from the observation device 2; A section suitable for analyzing the pronation for the designated section based on how the foot F _f reaches the ground of the subject at the time of traveling, that is, a section used for deriving the behavior information for the designated section. And an analysis interval setting unit 311 for setting (hereinafter referred to as an evaluation interval).

The section specifying unit 310 is used when a section corresponding to the stance phase is specified for a moving image associated with quantification information. The stance period is a period from the time when the foot F _f of the subject in the running state reaches the ground until the foot F _f completely leaves the ground.

The section specifying unit 310 according to the present embodiment is configured to set the start time and end time of the specified section for the moving image. Specifically, the section specifying unit 310 sets the time when the foot F _f first touches the ground in the stance period as the start time of the specified section, and the time when the foot F _f completely leaves the ground in the same stance period. Is set as the end point of the specified section.

The section specifying unit 310 may be configured to manually set the start time and end time of the specified section for the video, or automatically start and end the specified section for the video. You may be comprised so that a time may be set.

The analysis section setting unit 311 is based on the information in the specified section, and determines a way of wearing the foot F _f when the subject is traveling, and the contact type determination unit 311a and the foot F _f by the contact type determination unit 311a. A setting unit 311b for setting the evaluation interval according to a determination result of how to arrive, and a behavior information deriving unit 311c for deriving the behavior information based on information in the evaluation interval.

Grounding type discrimination section 311a is grounded angle to derive the ground angle HC heel F _h of the subject relative to the ground based on information in said designated section information representative of the (see FIG. 5) (hereinafter, referred to as a ground angle information) a deriving unit 311Aa, an angle for correcting the ground angle information derived in angle based on the ground angle deriving section 311Aa in the sagittal plane of the heel F _h of the subject P (see FIG. 1) with respect to the ground at the time of still standing The information correction unit 311ab and a classification determination unit 311ac that determines how to wear the foot F _f when the subject is running.

The contact angle deriving unit 311aa is configured to derive contact angle information based on quantification information at a time corresponding to the start time of the designated section.

Here, the ground angle HC contained in the ground angle information, as shown in FIG. 1, and FIG. 5 is that the angle between the reference line BL and the ground through the heel F _h in the sagittal plane P . Reference line BL through the heel F _h is, for example, a straight line connecting the heel bone ridge and the second趾先end in a stationary standing state. The sagittal plane P is a plane composed of a traveling direction Ah and a vertical direction Av as shown in FIG.

As will be described later, how the foot F _f arrives during traveling is determined based on the contact angle information, but the angle information obtained from the lower marker 210 does not necessarily match the contact angle HC. This due to the influence of displacement of the position for attaching the lower marker 210, there are cases where information of an angle about the resulting heel F _h is varied. That is, if the original ground angle HC and misalignment when used as the angle information of the heel F _h obtained from the lower marker 210 when the determination arrived how foot F _f occurs.

Therefore, in this embodiment, the angle information correcting unit 311Ab, so that applying a correction to the angle information obtained heel F _h from the lower marker 210.

The angle information correction unit 311ab receives offset information indicating the angle of the subject's heel F _h (angle HCs of the heel F _h with respect to the ground) of the subject taking the stationary posture based on the quantification information at the time of the stationary standing. To derive. The angle HCs of the subject's heel F _h taking a stationary posture is the angle of 踵 F _h obtained by observing the lower marker 210 in a state of being placed on the mat 220 as described above, and more specifically. 6A is an angle HCs formed by the depth axis (the orientation Am of the lower marker 210) indicated by the lower marker 210 and the ground (see FIGS. 1 and 6A).

Then, as shown in FIG. 6B, the angle information correction unit 311ab includes the offset information including the angle HCs and the contact angle information including the angle HCt of the heel F _h obtained from the lower marker 210 at the moment when the foot F _f contacts the ground. based, derives a relative angle of heel F _h at the time of running for the angle of the heel F _h during static standing, reset the information representing the relative angle as a ground angle information.

The contact angle HC is derived from the following equation (1).

For example, the angle of heel F _h obtained from the lower marker 210 at the instant that the angle i.e. HCs heel F _h obtained from the bottom marker 210 of a subject who is taking static standing posture -12 °, foot F _f is grounded When HCt is −2 °, the contact angle HC is a value obtained by subtracting the offset information HCs obtained from the lower marker 210 in the static standing posture from the angle HCt at the moment of contact, HC = (− 2 °) − (−12 °) = 10 °.

As a result, the angle information correction unit 311ab can remove an error that may occur when the marker 210 is attached, and more accurately determine how the foot F _f is to be attached.

The classification determination unit 311ac determines the type of how the foot F _f is to be worn when the subject is running. Classification determination section 311ac according to the present embodiment, first heel contact to heel F _h arrives on the ground at the beginning of the stance (see FIG. 7A), substantially simultaneously the entire back side of the foot F _f at the start of the stance ground flat ground (see FIG. 7B) to get to, or any on whether the corresponding first toe ground toe F _t arrives on the ground at the beginning of the stance (see FIG. 7C) is determined.

More specifically, the classification discriminating unit 311ac determines that the foot F _f should be worn if the contact angle HC represented by the new contact angle information is, for example, 0 ° or more (HC ≧ 0 °). Alternatively, it is determined that the contact is flat, and if the contact angle HC represented by the new contact angle information is less than 0 ° (HC <0 °), for example, it is determined that the foot F _f is attached to the toes. To do. For toe grounding, the ground where the toes first touch the ground at the start of the stance phase (how to put the foot), the ground where the forefoot, middle foot, etc. other than the buttocks first touch the ground Is also included.

Thus, classification determination section 311ac is foot F _f in stance phase is initially according to the direction of the toe F _t in the time of arrival on the ground (the direction of the vertical direction of the toes F _t relative to the ground) legs F _f It is configured to determine how to arrive.

The setting unit 311b sets the time point corresponding to the start time point of the designated section as the start time point of the evaluation section when the classification determination unit 311ac determines how to reach the subject's foot F _f as heel contact or flat contact, Furthermore, the time point of 55% to 65% of the entire specified section (from the start time to the end time of the entire specified section) is set as the end time of the evaluation section. Note that the end point of the evaluation section in this embodiment is set to a point in time when 65% of time has elapsed from the point corresponding to the start point of the designated section.

In addition, when the classification determination unit 311ac determines that the subject's foot F _f is toe-grounded when the classification determination unit 311ac determines that the time of 3% to 10% has elapsed from the start time of the designated section. The evaluation section is set as the start time point, and further, the time point when 55% to 65% of the entire specified section has elapsed is set as the end position of the evaluation section. In the present embodiment, when it is determined that the toe is in contact with the ground, a range of 8% to 65% of the entire designated section is set as the evaluation section.

In this way, by changing the start time of the evaluation section according to the difference in the contact angle, information not related to the behavior of the lower leg L during running or walking is taken into account when analyzing the pronation. That can be suppressed.

Those which, in the case of toe ground that the mechanism of the talocrural joint, prone to varus position heel F _h is (i.e., heel F _h collapse easily outward) due to the fact that there is an anatomical feature that It is. When evaluating pronation, it is desirable to evaluate the angle variation of the inner inclination of the heel F _h from there based on the natural upright position and orientation, the case where the toe ground than the natural state since the heel F _h tends to easily fall outwardly and obtains the angle variation of the inner inclination of the heel F _h therefrom, an amount corresponding extra amount of change in angle lying outwardly from being calculated.

So, for the subjects of the toe ground, remove the time zone from the arriving toe F _t is in the ground up to the vicinity of the heel F _h arrives from the evaluation period, a predetermined period of time of up to the vicinity of the heel F _h arrives on the ground by the elapsed time between the beginning of the evaluation section, so that it can be the same evaluation as when evaluating the angle variation of the inner inclination of the heel F _h relative to the angle of natural upright position Become.

Behavior information deriving unit 311c, as the behavior information, and the tilt angle information indicating the relative angle information indicating the degree falling into and out of the heel F _h for lower leg F _u, the degree falling into and out of the heel F _h relative to the ground, the heel Torsion angle information representing the twist degree of the lower leg F _u with respect to F _h is derived. In the present embodiment, the relative angle information is denoted by a symbol “β”, the tilt angle information is denoted by a symbol “β _g ”, and the twist angle information is denoted by a symbol “γ”. The following explanation will be given.

The relative angle information β is information that represents the angle of inward / outward inclination of the heel F _h with respect to the lower leg F _u in the evaluation section, and for example, indicates the direction of the heel F _h on the front face value as shown in FIG. variation in the evaluation in a section of an angle βt of the virtual line VL _f1 indicating the direction of the virtual line VL _h1 and lower leg F _u corresponds to this.

Further, the tilt angle information βg is information representing the angle βgt of the heel F _{h to} the inside and outside of the ground in the evaluation section. For example, the virtual line VL _h1 indicating the direction of the heel F _{h on} the front face and the ground This corresponds to the amount of change in the evaluation interval of the angle βgt formed by.

The twist angle information γ is information indicating the degree of twist of the lower leg F _u with respect to the heel F _h , for example, as shown in FIG. 15, a virtual line VL indicating the direction of the foot F _{f on} the horizontal plane of the heel F _{h. h2} and the amount of change in the angle gamma _t and the virtual line _{VL f2} indicating the direction of the lower leg _{F u} corresponds to this. The angles βt, βgt, and γt are not limited to the illustrated angles, and the angles of the portions that are equivalent to the angles may be observed.

As shown in FIGS. 2 and 8, the analysis unit 32 includes an analysis processing unit 320 for deriving analysis information P that quantitatively represents information obtained by analyzing the pronation based on behavior information, and the analysis processing unit 320. And an analysis result determination unit 321 that determines the analysis result of the pronation based on the derived analysis information P.

The analysis processing unit 320 derives analysis information P based on the relative angle information β, the tilt angle information β _g , and the twist angle information γ.

Analysis processing unit 320 according to the present embodiment, a tilt analyzing unit 320a to derive a tilt information P ₁ based on the relative angle information beta and tilt angle information beta _g of the evaluation interval, the relative angle information beta and tilt angle information based on the beta _g and twisting angle information gamma, and a twisting analyzer 320b for deriving the twisting information P ₂ in the evaluation interval.

Tilt analysis section 320a (in the present embodiment, vector components) relative angle information beta and tilt angle information beta _g and the component is configured to derive the tilt information P ₁ on an orthogonal coordinate system with.

Twisting analyzer 320b (in the present embodiment, vector components) relative angle information beta and tilt angle information beta _g and twisting angle information γ and the component deriving information P ₂ twisting on an orthogonal coordinate system with It is configured as follows.

Here, the tilt information _{P 1,} the twist information _{P 2,} the following equation (2), is calculated by the equation (3).

In equations (2) and (3), a, b, and c are values for weighting relative angle information β, tilt angle information β _g , and twist angle information γ, respectively. In this embodiment, the value of b is set larger than the values of a and c. In other words, the relative angle information β is most weighted. By the evaluation of pronation thus weighting based on the tilt information P ₁ and twisting information P ₂ were made, it is possible to accurately evaluate the closer to evaluate a more professional.

In the analysis result determination unit 321, a comparison reference value S ₁ is set as a determination reference for the size of the pronation (the size of the behavior of the lower leg L), and the comparison reference value S ₁ and the tilt information P _{1 are set.} by comparing the door, and is configured to determine the magnitude of pronation represented tilt information P _1.

Comparison reference values S _1, for example, the tilt information P ₁ in advance a plurality of subjects by using the evaluation system 1 of the present embodiment in advance by obtaining a population information can be obtained therefrom. For example, it is possible to set the value at the corresponding counted from the smaller when arranged tilted information P ₁ of a plurality of subjects in ascending order in a predetermined percentage of the total number of subjects as a comparison reference value S _1. The predetermined ratio is determined based on, for example, an evaluation result of a professional pronation with respect to the population information.

Analysis result judgment unit 321, when the tilt information P ₁ has a value greater than the comparison reference value S _1, is configured to tilt information P ₁ and analysis information P.

The analysis result of the determination unit 321, when the tilt information _{P 1} is equal to or less than the reference values _{S 1,} calls the twisted analyzer 320b, the twist information _{P 2} derived in該捻times analyzer 320b The analysis information P is configured.

As shown in FIG. 2, the evaluation unit 33 evaluates the analysis result of the pronation based on the analysis information P, and the evaluation that outputs the evaluation of the analysis result of the pronation by the behavior evaluation unit 330 And an output unit 331.

In the behavior evaluation unit 330, an evaluation reference value for classifying the pronation for each type is set. The behavior evaluation unit 330 according to the present embodiment is configured to be able to classify pronations into three types, and a small behavior reference value S _2a and a large behavior reference value S _2b are set as evaluation reference values. ing.

Then, the behavior evaluation unit 330, when the value of the analysis information P is equal to or less than the small behavior reference value S _2a is classified as pronation of the subject is under pronation and (Evaluation), the value of the analysis information P is When it is larger than the small behavior reference value S _{2a and} less than or equal to the large behavior reference value S _2b , the pronation of the subject is classified as neutral, and the value of the analysis information P is larger than the large behavior reference value S _2b In the case, the pronation of the target person is classified as overpronation.

Similarly the comparison reference values S ₁ small behavior reference value S _2a and atmospheric behavior reference value S _2b, leave the analysis information P in advance a plurality of subjects by using the evaluation system 1 of the present embodiment obtained as population information For example, the analysis information P of a plurality of subjects is classified into “under-pronation”, “neutral”, and “over-pronation” based on expert evaluation, and the classified analysis information P Can be set based on the average value and the standard deviation.

For example, for the small behavior reference value S _2a that is the boundary value between “under pronation” and “neutral”, the average of the analysis information P of the population classified as “under pronation” by the expert + the value of the standard deviation And the value of “neutral” (average of analysis information P−standard deviation) can be set as the small behavior reference value S _2a . For the large behavior reference value _S2b, which is the boundary value between “neutral” and “overpronation”, the average and standard deviation of the analysis information P of the population classified as “neutral” by the expert are added And an intermediate value of the mean-standard deviation of the analysis information P of the population classified as “overpronation” by the expert can be set as the large behavior reference value _S2b .

In the present embodiment, overpronation is a pronation in which the amount of change in relative angle information β, tilt angle information βg, and twist angle information γ tends to be large, and the amount of change tends to be small. Some pronations are under-pronation, and the pronations with medium change are neutral.

The evaluation output unit 331 is configured so that the classification result (evaluation result) can be visually confirmed and output to the screen of the display device 4.

As shown in FIG. 9, the evaluation result displays a type display unit 332 that displays the type of pronation and a type instruction unit 333 that indicates the type to which the subject's pronation corresponds.

The type display section 332 includes type areas 332a, 332b, and 332c that indicate a plurality of different types of pronations. In the present embodiment, the pronation of the subject is classified into three types, underpronation, neutral, and overpronation. Therefore, the type display portion 332 includes a type area 332a indicating underpronation and a neutral state. A type area 332b indicating the existence and a type area 332c indicating overpronation are included.

The three type areas 332a, 332b, and 332c are color-coded, and the colors assigned to the type areas 332a, 332b, and 332c gradually change as they become adjacent to the other type areas 332a, 332b, and 332c. is doing.

The type instruction unit 333 includes a right foot instruction unit 333a indicating the type of pronation of the right lower leg L and a left foot instruction unit 333b indicating the type of pronation of the lower left leg L. Yes. The right foot instruction unit 333a and the left foot instruction unit 333b are configured to be displayed at positions according to the pronation tendency represented by the analysis information P.

The evaluation system 1 according to the present embodiment has the above configuration. Subsequently, the analysis and evaluation method of the behavior of the lower leg L by the evaluation system 1 will be described.

As shown in FIG. 10, the evaluation method of the behavior of the lower leg L by the evaluation system 1 is based on the preparation process (S1) for acquiring the subject information and the analysis based on the subject information obtained in the preparation process. A pre-processing step (S2) for deriving information to be used, an analysis step (S3) for analyzing the pronation in the stance phase based on the information of the subject acquired in the preparation step, and an analysis of the pronation in the analysis step An evaluation step (S4) for evaluating the result and a confirmation step (S5) for checking the evaluation result of the pronation in the evaluation step are provided. In the present embodiment, after the confirmation step (S5), a post-step (S6) for explaining the evaluation result of the pronation and removing the measuring instrument 21 (upper marker 210, lower marker 210) is performed.

That is, the method for evaluating the behavior of the lower leg L according to the present embodiment is an analysis by the analysis method of the behavior of the lower leg L including the preparation step (S1), the pretreatment step (S2), and the analysis step (S3). It is comprised so that a result may be evaluated at an evaluation process (S4).

In the preparation step (S1), information on the subject (height, weight, etc.) is input to the processing device 3 (S10). And the measuring instrument 21 is attached to a subject (S11). In this embodiment, mounting the lower marker 210 in the heel _{F h,} attaching the upper marker 210 above the ankle _{F n.}

Then, a still image of the subject taking a still standing posture is taken from the back (S12). At this time, the subject rides on the mat 220, places the foot F _f in accordance with the foot placement region 220a, and further sets the direction of the foot F _f (the direction in which the heel F _h and the toe F _t are arranged) as a reference line. Align with the longitudinal direction of 220b.

Subsequently, a moving image of the subject running on the treadmill 221 is photographed from the back so that the upper marker 210 and the lower marker 210 can be seen (S13). Then, a still image and a moving image associated with the quantification information are output to the processing device 3 as the observation information.

In the preprocessing step (S2), the specified section is determined for the moving image by the section specifying unit 310 (S20). In the present embodiment, as described above, the time when the foot F _f first reaches the ground in the stance phase is set as the start time of the designated section, and the time when the foot F _f is completely separated from the ground in the same stance period is set as the specified section. The end point of.

Then, the analysis interval setting unit 311 sets the evaluation interval for the specified interval, and the behavior information deriving unit 311c derives behavior information based on the information in the evaluation interval (S21).

More specifically, as shown in FIG. 11, first, the ground contact type determination unit 311a determines how the foot F _f is to be worn when the subject is running. In the present embodiment, after the ground contact angle deriving unit 311aa derives the ground contact angle information, the angle information correcting unit 311ab uses the ground contact angle information and the information derived based on the start time information of the evaluation section as the ground contact angle information. Re-set as information (S210).

Then, it is determined arrive way of the subject's foot _{F f} classification determination section 311ac is based on a new ground angle information (S211). When the classification determination unit 311ac determines that the subject's foot F _f is to be worn by heel contact or flat contact, the setting unit 311b sets the time point corresponding to the start time of the specified section as the start time of the evaluation section. Further, a point in time when the predetermined time of the entire designated section, for example, 65% has elapsed, is set as the end point of the evaluation section (S212).

On the other hand, when the classification determination unit 311ac determines that the subject's foot F _f is toe-grounded, the setting unit 311b determines the point in time when a predetermined time has elapsed from the start point of the specified interval. Is set as the start time of the evaluation section, and further, a time when a predetermined time, for example, 65% of the entire specified section has elapsed, is set as the end time of the evaluation section (S213).

Then, the behavior information deriving unit 311c derives the relative angle information β, the tilt angle information β _g, and the twist angle information γ that are the behavior information based on the information in the evaluation section (S214).

In analysis step (S3), as shown in FIG. 12, the tilt analyzing unit 320a, based on the relative angle information beta tilt angle information beta _g to derive the tilt information _{P 1} as analysis information P (S30).

The analysis result determination unit 321, by comparing the comparison reference values S ₁ and tilt information P _1, to determine the magnitude of pronation (S31).

If the analysis result determination unit 321 determines that the value of the tilt information P ₁ is larger than the comparison reference value S _1, the tilting information P ₁ is the analysis information P (S32).

Then, the analysis result when the determination unit 321 determines that the value of the tilt information P ₁ is smaller than the comparison reference value S _1, the analysis results twisting the determination unit 321 analyzer 320b is called (executed),該捻times twisting information _{P 2} is derived by the analysis unit 320b (S33). Then, twist information _{P 2} is an analysis information P (S34).

In evaluating step (S4), as shown in FIG. 13, the behavior evaluation unit 330 and compares the analysis information P and the small behavior reference value _{S 2a} and atmospheric behavior reference value _{S 2b} (S40).

If the value of the analysis information P is equal to or less than the small behavior criterion S _2a is classified as pronation of the subject is under pronation (Evaluation) and (S41), the value of the analysis information P is small behavior criterion S greater than _2a, when it is lower than the atmospheric behavior reference value S _2b is pronation subjects are classified as neutral (S42), if the analysis information P is greater than atmospheric behavior reference value _S2b is subject Is classified as overpronation (S43). Then, the type of the pronation is determined (S44), and the evaluation of the analysis result of the pronation is displayed on the display device 4.

In the confirmation step (S5), the evaluation of the analysis result of the pronation displayed on the display device 4 is confirmed. In this embodiment, since the type display unit 332 is displayed on the display device 4 as an evaluation of the analysis result of the pronation, the type regions 332a, 332b, and 332c pointed to by the right foot instruction unit 333a and the left foot instruction unit 333b, respectively. By confirming, the type of pronation can be confirmed.

In the post-process (S6), as described above, the explanation of the pronation evaluation result and the removal of the measuring instrument 21 (upper marker 210, lower marker 210) are performed.

As described above, according to the evaluation system 1 and the evaluation method of pronation by the evaluation system 1 according to the present embodiment, the relative representing a degree falling from the behavior of Ashikabu L into and out of the heel F _h for lower leg F _u In addition to the angle information β, the behavior of the lower leg L can be analyzed based on the tilt angle information β _g indicating the degree of inward and outward tilt of the heel F _h with respect to the ground. Therefore, since the evaluation system 1 and the pronation evaluation method using the evaluation system 1 perform the evaluation based on a more detailed analysis result of the plurality of behaviors constituting the pronation, the evaluation accuracy of the behavior of the lower leg L is increased. be able to.

Here, the evaluation system 1 according to the present embodiment and the pronation evaluation method using the evaluation system 1 are based on an experiment example to be described later, and professionals related to the pronation (for example, human motion analysis such as biomechanics and physical therapy) Those who have knowledge of anatomical structures, those who have experience in teaching running forms (running movements), and engineers who are engaged in the design and functional evaluation of running shoes, etc. However, when analyzing the behavior of the lower leg L, the amount of fall of the heel F _h with respect to the lower leg F _u of the subject and the amount of fall of the heel F _h with respect to the ground are given priority. Is based on the evaluation.

That, of the amount of inclination of the inner and outer heel F _h for lower leg F _u of the Target, and the amount of inclination of the inner and outer heel F _h relative to the ground, and each type of pronation (trend behavior Ashikabu L) high correlation, for example, the amount of inclination and from the behavior of Ashikabu L into and out of the heel F _h for lower leg F _u, is large amount falling into and out of the heel F _h relative to the ground is possible that over-pronation If the inclination is high and the inclination amount is small, there is a high possibility of underpronation.

Therefore, the evaluation method of pronation by evaluation system 1 and the evaluation system 1 according to this embodiment, specialists in and out of the heel F _h for lower leg F _u is high correlation with preferentially the focused and pronation Analysis and evaluation of the pronation based on the inclination of the foot (angle represented by the relative angle information β) and the inclination of the foot F _f inside and outside the heel F _h (the angle represented by the inclination angle information β _g ) Thus, an analysis result and an evaluation result (that is, an accurate analysis result and an evaluation result) close to an analysis result and an evaluation result of pronation by an expert can be obtained.

Further, the processing unit 30 includes a relative angle information beta and tilt angle information tilt information P ₁ and beta _g which is information derived based on, and the relative angle information beta tilt angle information beta _g and twisting angle information γ may be configured to perform analysis of the behavior of the lower leg L with a twisting information P ₂ is derived information based on.

This configuration, in the experimental example described later, experts variation in falling into and out of the lower leg L of the subject (the amount of inclination and into and out of the heel F _h for lower leg F _u, and out of the heel F _h relative to the ground When the amount of heel F) is small, it is based on the analysis and evaluation of stepwise pronation that takes into account the degree of twist of the lower leg F _u relative to the heel F _h . only the degree twisting of the lower leg F _u for _h can be determined over pronation larger.

If the evaluation system 1 and the evaluation method of pronation by the evaluation system 1 according to the present embodiment, the tilt information P ₁ is determined to be smaller than the comparison reference value S _1, the relative angle information beta and tilt angle information beta _g based on the twisting angle information γ and, in order to analyze the information P to derive twisting information P _2, as described above, while the slope of the inner Ashikabu L is small, the lower leg F _u inner Can be classified as overpronation, which allows analysis and evaluation of pronation in the same procedure as an expert, thus improving the accuracy of evaluation results .

In the evaluation system 1 according to the present embodiment, the behavior of the lower leg L is analyzed on an orthogonal coordinate system using the relative angle information β and the tilt angle information β _g as vector components, so the relative angle information β and the tilt angle information and beta _g is in line with the actual behavior of the lower leg L used for analysis in the state shown quantitatively, thereby, increases the accuracy of the analysis of the behavior of Ashikabu L.

Further, in the evaluation result, the type of the pronation for each of the left and right lower leg L of the subject is indicated by the type instruction unit 333, so that the pronation of the subject can be known in detail.

Furthermore, since the colors assigned to the type areas 332a, 332b, and 332c are displayed so as to gradually change toward the other type areas 332a, 332b, and 332c adjacent to each other, the tendency of the subject's pronation Can know in detail.

It should be noted that the evaluation system of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes are made without departing from the gist of the present invention.

The evaluation system 1 according to the above embodiment is configured to perform the analysis of the pronation and the evaluation of the analysis result of the pronation in one system. The evaluation system may be divided into an evaluation system that evaluates the pronation based on the analysis result of the pronation by the analysis system.

Although not particularly mentioned in the above embodiment, the imaging device 20 and the measuring instrument 21 can acquire information indicating the posture (orientation) of the lower leg L of the subject in the stationary standing state, the running state, or the walking state. There is no particular limitation, and for example, an optical three-dimensional motion analysis apparatus may be used, or a sensing device such as an acceleration sensor or a gyro sensor may be used. Note that when a sensing device is used, posture information obtained by the sensing device may be transmitted to the processing device 3 by wireless communication or the like.

In the above embodiment, the processing device 3 and the display device 4 are integrated, but the present invention is not limited to this configuration. For example, the processing device 3 and the display device 4 may have different configurations. For example, a configuration in which the photographing device 20, the processing device 3, and the display device 4 are integrated, such as a PC with a camera.

In the above embodiment, the relative angle information β, the tilt angle information β _g , and the twist angle information γ are used as vector components, but the present invention is not limited to this configuration. For example, the relative angle information β, the tilt angle information β _g , and the twist angle information γ may be components each having only a numerical value. Further, the tilt information P ₁ and the twist information P ₂ may be components each having only a numerical value.

In the above embodiment, the tilting information P ₁ is the relative angle information beta, had been calculated by the vector calculating the tilt angle information beta _g, for example, to store a plurality of information that are candidates for tilt information P ₁ and tables prepares the database, and the relative angle information beta, may be based on the tilt angle information βg be configured to select the tilt information P ₁ stored in the table or database .

In the above embodiment, the twist information P ₂ is calculated by performing a vector operation on the relative angle information β, the tilt angle information β _g, and the twist angle information γ. For example, the twist information P ₂ A table or database storing a plurality of pieces of candidate information is prepared and stored in the table or database based on the relative angle information β, the tilt angle information β _g, and the twist angle information γ. the twisting information P ₂ to which may be configured to select.

In the above embodiment, the analysis unit 32 (analysis processing unit 320) derives the analysis information P based on the relative angle information β, the tilt angle information β _g , and the twist angle information γ, but this configuration is limited. Sarezu, for example, the relative angle information beta, may be configured to derive analytical information P based on the tilt angle information beta _g.

The analysis processing unit 320 in the above embodiment, was configured to the tilt information P ₁ or twisting information P ₂ and analysis information P in accordance with the magnitude of the tilt information P _1, it is not limited to this configuration. For example, the analysis processing unit 320 uses the information obtained by calculating the tilt information P ₁ and the twist information P ₂ as the analysis information P, derives the analysis information P based on the tilt information P ₁ , times information P ₂ may be or to derive the analysis information P based on.

In the above embodiment, the evaluation unit 33 outputs the type of the pronation as an evaluation of the analysis result of the pronation, but is not limited to this configuration. For example, the evaluation unit 33 may output shoes suitable for the analysis result of pronation, taping, and the like as the evaluation of the analysis result.

In the above embodiment, the behavior evaluation unit 330 is configured to be able to classify pronations into three types, but is not limited to this configuration. For example, the behavior evaluation unit 330 may be able to classify the pronation into two types, or may be classified into four or more types. In this case, depending on the number of types of classification may be changed comparative reference value S ₁ and the behavior reference value S _2.

In the above embodiment, although the measuring instrument 21 is attached to such heel F _h in a state in which the subject has become barefoot, even subject is to attach to such heel F _h on the shoe in a state of shoes Good. In this case, each reference value S ₁ , S _2a , S _2b may be changed according to the type of shoe.
In the above embodiment, the treadmill 221 is used as the auxiliary instrument 22, but the treadmill 221 is not necessarily used, and the subject actually runs or walks without using the treadmill 221 and observes it. You may make it observe with the apparatus 2. FIG.

[Experimental Example 1]
In Experiment Example 1, when an expert analyzes and evaluates a pronation, an experiment is performed to confirm a site to which attention is given preferentially, and an experiment to confirm at which timing in the stance phase the evaluation is performed. It was.

In Experimental Example 1, 10 general adult men and women were subjects. The test subject was allowed to perform treadmill running with bare feet running at a constant speed (8 km / h), and the lower limbs of the test subject were photographed with a video camera (photographing device) from the back (back of the treadmill).

Then, a video was prepared by cutting out a section corresponding to one stance phase from each video shot of each subject, and the video was presented to 15 experts.

Experts are allowed to observe each subject's video (video during one stance phase), and then the pronation type of each subject is “overpronation”, “pronation”, “neutral”, “under” Evaluation was made in five stages: "Pronation" and "I don't know". The behavior of the lower leg L indicated by “overpronation”, “neutral”, and “underpronation” is as described in the above embodiment, and the “pronation” here is the behavior of the lower leg L. This is a notation as a type that is intermediate between “overpronation” and “neutral”, and is distinguished from “pronation” which is the definition of the behavior itself. “I don't know” indicates that the type of pronation of the subject could not be determined.

Also, the experts were asked to answer the reasons for the evaluation along with the evaluation of each subject's pronation type. The items answered as the reason for the evaluation are the parts used as judgment criteria (most important in the evaluation of pronation) and the contents of the movement of the parts.

In addition, the expert is allowed to select a region based on the judgment criteria from the heel F _h , the medial midfoot, the lower leg F _u , and others, and the selected region is subjected to the maximum angle, angle change, change speed, and lateral direction. Based on the amount of movement, twist, orientation, etc., the feature of the movement of the part as a criterion was selected.

As a result of collecting the above answer items, the expert first evaluates the pronation based on the behavior of 踵 F _h (that is, information corresponding to the relative angle information β and the tilt angle information β _g ). Furthermore, if the behavior of the heel F _h is small, internal rotation of the lower leg (i.e., information corresponding to the twist angle information gamma) were also found to evaluated pronation including.

Therefore, as in the evaluation method by the evaluation system 1 and the evaluation system 1 according to the embodiment, firstly, it derives the tilt information P ₁ based on the relative angle information beta and tilt angle information beta _g, tilting information When the twist information P ₂ is derived based on the relative angle information β, the tilt angle information β _g, and the twist angle information γ when the value of P ₁ is small, if the behavior of 踵 F _h is large, the relative angle The pronation is evaluated by the information β and the tilt angle information β _{g. When} the behavior of 踵 F _h is small, the pronation including the twist angle information γ is added to the relative angle information β and the tilt angle information β _g. Therefore, the pronation can be evaluated by a process that matches the pronation evaluation process by an expert.

In Experiment 1, at the same time, it was confirmed at which timing the expert was evaluating during the stance phase. Specifically, a video clipped from a section corresponding to one stance period shown to an expert consists of a predetermined number of frames, and the number of frames is displayed in the movie in order, and the evaluation is performed at which frame number. I made them answer.

As a result of summing up the responses, all experts evaluated between the start of the stance phase and around 60% of the total stance phase, and evaluated the section after 65% of the stance phase. There was no expert going on.

From this, it is sufficient to evaluate the behavior of the lower leg L from the start of the stance phase to the time when 55% to 65% of the entire stance phase has elapsed, and the subsequent sections are excluded from the evaluation. Accurately reproduce expert evaluations. In addition, by shortening the evaluation section in this way, there is an advantage that the amount of information processing can be reduced and the time required for the analysis can be reduced as compared to the case where the entire stance phase is set as the evaluation section.

[Experimental example 2]
In Experimental Example 2, an experiment was conducted to examine the correlation between the subject's pronation score (the value of the analysis information P in the above embodiment) and the expert's evaluation.

In Experimental Example 2, 30 adult males and females were subjects. The test subject was subjected to treadmill running under the same conditions as in Experimental Example 1, and the analysis in the evaluation method of the above embodiment was performed based on the relative angle information β, tilt angle information β _g , and twist angle information γ in the stance phase. Pronation was evaluated along the steps (S3) and (S4).

As a result of evaluating the pronation, 25 out of 30 people are determined to have a large behavior of 踵 F _h (P ₁ > S ₁ ), and the other 5 people have a small behavior of 踵 F _h (P ₁ <S ₁ ). It was determined. That is, the evaluation system 1, the 25 persons among the 30 people evaluated the pronation by tilting information P _1, 5 persons others were evaluated pronation by twisting information P _2.

In addition, after allowing the expert to observe the same video as that used for the evaluation, the pronation type of each subject was evaluated in the same manner as in Experimental Example 1. As a result, as shown in the graph of FIG. 16 in which the vertical axis represents the pronation score evaluated by the method according to the embodiment and the horizontal axis represents the evaluation of the pronation type by the expert, both have high correlation. Show. In other words, subjects with a high pronation score are classified as overpronation in the expert's evaluation, and subjects with a low pronation score are classified as underpronation. It can be seen that the house evaluation can be accurately reproduced.

Therefore, the tilt information P ₁ and the twisting as in the evaluation method based on the part, section, and criteria that the expert emphasizes in the pronation evaluation, that is, the evaluation system 1 according to the above embodiment and the evaluation method by the evaluation system 1 information P ₂ and by so stepwise derive, appropriately quantify the behavior of pronation, it can be reproduced by accurately and automatically evaluated by specialists.

DESCRIPTION OF SYMBOLS 1 ... Evaluation system, 2 ... Observation apparatus, 3 ... Processing apparatus, 4 ... Display apparatus, 20 ... Imaging apparatus, 21 ... Measuring instrument, 22 ... Auxiliary instrument, 30 ... Processing part, 31 ... Pre-processing part, 32 ... Analysis part 33 ... evaluation part 210 ... marker (upper marker, lower marker) 220 ... mat 220a ... foot placement region (left foot placement region, right foot placement region) 220b ... reference line 221 ... treadmill 310 ... Section designation unit, 311 ... analysis section setting unit, 311a ... grounding type determination unit, 311aa ... grounding angle derivation unit, 311ab ... angle information correction unit, 311ac ... classification determination unit, 311b ... setting unit, 311c ... behavior information derivation unit, 320 ... Analysis processing unit, 320a ... Tilt analysis unit, 320b ... Torsion analysis unit, 321 ... Analysis result judgment unit, 330 ... Behavior evaluation unit, 331 ... Evaluation output unit, 332 ... Type display unit, 33 a, 332b, 332c ... type region, 333 ... type instruction unit, 333a ... right instruction field, 333b ... instructing unit for the left foot, Ah ... running direction, Av ... vertically, BL ... reference line, F f _... right foot, F _f ... left foot, F _f ... foot, F _f ... both feet, F _h ... heel, F _n ... ankle, F _t ... tip, F _u ... lower leg, HC ... ground contact angle, HCs ... offset information, L ... lower leg, P ... analysis information, P ... sagittal plane, P ₁ ... tilt information, P ₂ ... twisting information, S ₁ ... comparison reference value, S ₂ ... behavior reference value, S _2a ... small behavior reference value, S _2b ... large behavior Reference value, VL _f1 ... virtual line, VL _f2 ... virtual line, VL _h1 ... virtual line, VL _h2 ... virtual line, β ... relative angle information, βg ... tilt angle information, γ ... twist angle information,

Claims (18)

1. With an analyzer that analyzes the behavior of the lower leg, including the lower leg and legs during the stance phase,
   The analyzer has a processing unit for deriving analysis information quantitatively representing the behavior of the lower leg portion,
   The processing unit, based on the behavior of the lower leg, relative angle information indicating the degree of inversion of the heel with respect to the lower leg, and tilt angle information indicating the degree of inversion of the heel with respect to the ground of the foot; And analyzing the behavior of the lower leg, which is configured to derive the analysis information based on the relative angle information and the tilt angle information.
2. The processor is
   The leg lowering behavior analysis system according to claim 1, wherein the analysis information is derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as components.
3. The processor is
   The leg lowering behavior analysis system according to claim 2, wherein the analysis information is derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components.
4. The processor is
   Deriving twist angle information representing the twist degree of the lower leg with respect to the heel from the behavior of the lower leg,
   Tilt information which is information derived based on the relative angle information and the tilt angle information, and twist which is information derived based on the relative angle information, the tilt angle information and the twist angle information. Information and
   The leg lowering behavior analysis system according to claim 1, wherein the analysis information is derived based on the tilt information and the twist information.
5. The processor is
   Deriving the tilt information on an orthogonal coordinate system having the relative angle information and the tilt angle information as components,
   The leg lowering behavior analysis system according to claim 4, wherein the twisting information is derived on an orthogonal coordinate system having the relative angle information, the tilt angle information, and the twist angle information as components. .
6. The processor is
   Deriving the tilt information on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components,
   The analysis of the behavior of the lower leg portion according to claim 5, wherein the twist information is derived on an orthogonal coordinate system having the relative angle information, the tilt angle information, and the twist angle information as vector components. system.
7. The processor is
   Determine the type of how to put the foot on the ground during the running of the subject to be analyzed for the behavior of the lower leg,
   The relative angle information and the tilt angle information are derived based on information in a section set in a stance phase according to a determination result of the type of how to put on the foot. An analysis system for the behavior of the lower leg.
8. The processor is
   The manner in which the subject reaches his / her feet during running is either a heel-contact where the heel first touches the ground in the stance phase, or a flat-ground where the entire back side of the foot lands on the ground substantially simultaneously in the stance phase. If it is determined that there is, the start time of the subject's stance phase is set as the start time of the interval, and the time when 55 to 65% of the entire stance phase has elapsed is set as the end time of the interval. The analysis system of the behavior of the lower leg part according to claim 7 constituted as follows.
9. The processor is
   How to get the feet while the subject is running,
   In the stance phase, when it is first determined that the toes are grounded on the ground,
   The time when 3 to 10% of the entire stance phase has elapsed is set as the start time of the section, and the time when 55 to 65% of the time in the stance phase has elapsed is set as the end time of the section. The system for analyzing the behavior of the lower leg portion according to claim 7 or 8, wherein the behavior analyzing system is configured to perform the above-described operation.
10. The processor is
    10. The lower leg portion according to claim 8, wherein the type of how to put on the foot is determined based on an angle of a heel in a sagittal plane with respect to the ground when the subject is standing still. Behavior analysis system.
11. A mat for aligning the direction of the lower leg when the subject takes a standing posture;
    On the mat, two reference lines that are straight lines parallel to each other, and two reference lines that serve as a reference for aligning the direction of the foot when the subject is standing still are drawn,
    The processor is
    The type of how to put on the foot is determined based on an angle of a heel in a sagittal plane with respect to the ground of a subject who has taken a stationary posture with the feet aligned with the reference line. 10. The analysis system of the behavior of the lower leg according to 10.
12. An analysis process for analyzing the behavior of the lower leg including the lower leg and legs during the stance phase,
    In the analysis process,
    Based on the behavior of the lower leg, derive relative angle information indicating the degree of inversion of the heel with respect to the lower leg, and tilt angle information indicating the degree of inclination of the heel with respect to the ground of the foot,
    A method for analyzing the behavior of the lower leg, which derives analysis information, which is information that quantitatively represents the behavior of the lower leg, based on the relative angle information and the tilt angle information.
13. In the analysis step,
    The analysis method of the behavior of the lower leg part according to claim 12, wherein the analysis information is derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as components.
14. In the analysis step,
    The method for analyzing the behavior of a lower leg according to claim 13, wherein the analysis information is derived on an orthogonal coordinate system having the relative angle information and the tilt angle information as vector components.
15. In the analysis step,
    Deriving twist angle information representing the twist degree of the lower leg with respect to the heel from the behavior of the lower leg,
    Tilt information which is information derived based on the relative angle information and the tilt angle information, and twist which is information derived based on the relative angle information, the tilt angle information and the twist angle information. Information and
    The analysis method of the behavior of the lower leg part according to claim 12, wherein the analysis information is derived based on the tilt information and the twist information.
16. Observing the lower leg including the lower leg and leg in the stance phase and obtaining observation information that is information on the posture of the lower leg, and analyzing information analyzing the behavior of the lower leg based on the observation information And a processing device that executes a process of evaluating the behavior of the lower leg based on the analysis information,
    The processor is
    Based on the observation information, relative angle information indicating the degree of inversion of the heel with respect to the lower leg, tilt angle information indicating the degree of inversion of the heel with respect to the ground of the foot, and the angle of the lower leg with respect to the heel A pre-processing unit for deriving behavior information including twist angle information representing a degree of twist;
    Tilt information, which is quantitative information derived based on the relative angle information and the tilt angle information, or quantitative information derived based on the relative angle information, the tilt angle information, and the twist angle information. An analysis unit for deriving the analysis information composed of any of the twist information;
    An evaluation unit that evaluates the behavior of the lower leg based on the analysis information,
    Evaluation system for the behavior of the lower leg.
17. In the processing device, an evaluation reference value that is a reference value for comparison with the tilt information is stored in advance.
    The said analysis part performs the process which judges which information of the said tilt information and the said twist information is used as said analysis information based on the comparison result of the said tilt information and the said evaluation reference value. The evaluation system for the behavior of the lower leg.
18. A preparatory step of observing the lower leg including the lower leg and the leg in the stance phase, and obtaining observation information that is information on the posture of the lower leg;
    Based on the observation information, relative angle information indicating the degree of inversion of the heel with respect to the lower leg, tilt angle information indicating the degree of inversion of the heel with respect to the ground of the foot, and the angle of the lower leg with respect to the heel A pre-processing step for deriving behavior information including twist angle information representing a degree of twist;
    Tilt information, which is quantitative information derived based on the relative angle information and the tilt angle information, or quantitative information derived based on the relative angle information, the tilt angle information, and the twist angle information. An analysis process for deriving analysis information consisting of any of the twist information;
    An evaluation step of evaluating the behavior of the lower leg based on the analysis information,
    Evaluation method of the behavior of the lower leg.

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