JP4933365B2 - Ankle joint dynamic alignment evaluation system and ankle joint dynamic alignment evaluation method - Google Patents

Description

  The present invention particularly relates to an ankle joint dynamic alignment evaluation system and an ankle joint dynamic alignment evaluation method.

  Ankle joint alignment abnormalities (overpronation, underpronation, etc.) are a major cause of sports impairment, and the dynamic alignment of ankle joints is measured to correct alignment abnormalities (overpronation, underpronation, etc.). Properly prescribing equipment (shoes, insoles, etc.) is important in preventing sports problems.

  Conventionally, when determining suitable shoes for a user for jogging (running), walking, etc., the dynamic alignment of the user's ankle joint is, for example, overpronation (in pronation), neutral, under A method of classifying into three types of pronation (excessive overshooting) and selecting shoes according to each classification is adopted. Here, “over-pronation” means a state in which the portion around the heel is excessively tilted inward as shown in FIG. 7, and “under-pronation” means 踵A state where the part around is excessively inclined outward. “Neutral” means a state in which the portion around the heel is not excessively inclined as shown in FIG.

  As a method for measuring and evaluating the dynamic alignment of the ankle joint of the user of the shoe, for example, the user's foot during running walking is photographed from behind and the image is displayed on a monitor such as a personal computer. As shown in FIG. 9, the angle formed by the center line K1 drawn on the heel portion and the center line K2 drawn on the calf portion is measured, and according to the magnitude of this angle, overpronation, neutral, In general, evaluation is performed by classifying into three underpronations.

  As in the past, when the center line K1, K2 is drawn on the user's foot to shoot the image during running and walking to classify the dynamic alignment of the ankle joint, or the user's foot image is taken, When the centerline K1, K2 is drawn on the foot image displayed on the monitor to classify the dynamic alignment of the ankle joint, the operator who takes pictures of the foot and operates the personal computer for this classification has experience. Based on this, the center lines K1 and K2 are subjectively drawn. For this reason, an error (human error) may occur when the center line is drawn. Moreover, the operator who performs this operation needs specialized knowledge regarding the evaluation of dynamic alignment, and there is a possibility that an error may occur in the evaluation when a person who does not have the specialized knowledge performs this evaluation. In addition, in the procedure as described above (foot photography, data import, etc.), it took time to obtain an evaluation result (classification result).

  The present invention has been made in view of such circumstances, and it is difficult to cause human error due to an operator's subjective operation, and an ankle joint dynamic alignment capable of producing an evaluation result in a short time. It is an object to provide an evaluation system.

  It is another object of the present invention to provide an ankle joint dynamic alignment evaluation method that makes it difficult for human error due to an operator's subjective operation to occur, and that can provide an evaluation result in a short time. .

An evaluation system for dynamic alignment of ankle joints according to the present invention is for solving the above-described problem, and performs a running / walking motion performed in such a manner that the soles of the feet are sequentially grounded from the heel to the toes. calculating a measuring device for measuring the pressure distribution behind the該被measurement's foot at each predetermined measuring time when done by, the measured position of the pressure center of the pressure distribution for each measurement time, is computed Based on the position of the pressure center, the trajectory of the pressure center in a series of running and walking motions is determined, and the deviation amount of the trajectory of the pressure center with respect to the linear reference line set from the heel side to the toe side is calculated. And an arithmetic unit.

  According to this configuration, the pressure distribution on the sole of the measurement subject's foot is measured by the measurement device, the locus of the pressure center in the measured pressure distribution is calculated, and the deviation amount of the pressure center from the reference line is calculated by the calculation device. In addition, by using this deviation amount as an evaluation index (classification index) of the dynamic alignment of the ankle joint, there is no element determined by the operator's operation, and errors due to the operator's subjective operation are less likely to occur, Evaluation results can be obtained in a short time.

  In the ankle joint dynamic alignment evaluation system, the deviation amount is preferably calculated as an area of a region formed by a reference line and a pressure center locus.

  As described above, by using the area of the region formed by the reference line and the locus of the pressure center as the deviation amount as the classification index for the dynamic alignment of the ankle joint, an error due to the subjective operation of the operator is less likely to occur. Evaluation results can be obtained in a short time.

  The ankle joint dynamic alignment evaluation system may classify the ankle joint dynamic alignment based on a value obtained by dividing the area as the deviation amount by an amount corresponding to the size of the foot of the person to be measured. desirable.

  According to such a configuration, there is an individual difference in the size of the measurement subject's foot, but by dividing the area as the deviation amount by an amount corresponding to the size of the measurement subject's foot, The deviation amount as an evaluation index for dynamic alignment can be normalized (normalized), and the dynamic alignment of the ankle joint of the subject can be evaluated (classified) regardless of the size of the subject's foot.

  In the ankle joint dynamic alignment evaluation system, it is preferable that the deviation amount is calculated as a maximum value of an interval between a reference line and a pressure center locus.

  According to such a configuration, the maximum value of the interval between the reference line and the locus of the pressure center is used as the deviation amount as the classification index for the dynamic alignment of the ankle joint, so that an error due to the subjective operation of the operator is less likely to occur. In addition, it is possible to obtain an evaluation result in a short time.

  Further, it is desirable to classify the dynamic alignment of the ankle joint based on a value obtained by dividing the maximum value of the distance between the reference line and the center of pressure as the deviation amount by an amount corresponding to the size of the foot of the person to be measured. .

  According to such a configuration, there is an individual difference in the size of the measurement subject's foot, but the maximum value of the distance between the reference line as the deviation amount and the locus of the pressure center depends on the size of the measurement subject's foot. The amount of deviation as an evaluation index for the dynamic alignment of the ankle joint can be normalized, and the dynamic alignment of the ankle joint of the subject can be evaluated regardless of the size of the subject's foot ( Classification).

  The ankle joint dynamic alignment evaluation system may employ a configuration including a display device capable of displaying the locus of the pressure center and a reference line.

  According to this configuration, by displaying the pressure center locus and the reference line on the display device, the operator can visually grasp the tendency of the deviation of the pressure center locus from the reference line.

  Further, the ankle joint dynamic alignment evaluation system is based on a preset reference value obtained by dividing the area as the deviation amount by an amount corresponding to the size of the measurement subject's foot. Therefore, it is possible to adopt a configuration in which one of overpronation, neutral and underpronation is classified.

  According to this configuration, by classifying the standardized area into one of overpronation, neutral, and underpronation based on a preset reference (threshold value), the ankle joint of the measurement subject It is possible to determine shoes suitable for dynamic alignment.

  Further, in the ankle joint dynamic alignment evaluation system, the arithmetic device is a value obtained by dividing the maximum value of the distance between the reference line as the deviation amount and the center of pressure by an amount corresponding to the size of the foot of the person being measured. Can be classified into any one of overpronation, neutral, and underpronation based on a preset criterion.

  According to such a configuration, by classifying the standardized maximum value into one of overpronation, neutral, and underpronation based on a preset reference (threshold value), A shoe suitable for dynamic joint alignment can be determined.

In addition, the method for evaluating dynamic alignment of an ankle joint according to the present invention includes the subject 's foot when the subject performs a running / walking motion performed in such a manner that the sole of the foot is sequentially grounded from the heel to the toe. of the pressure distribution on the back were measured by the measuring device at every predetermined measurement time, the measured position of the pressure center of the pressure distribution was computed by the computing unit for each measurement time, based on the position of the computed pressure center , characterized in that the calculated determining the trajectory of the pressure center in a series of run walking in computing device, a deviation amount of the trajectory of the center of pressure for the straight reference line is set from the heel side to the toe side in the arithmetic unit And

  According to this method, the pressure distribution on the sole of the person to be measured is measured by the measuring device, the locus of the pressure center in the measured pressure distribution is calculated by the calculation device, and the deviation amount of the pressure center from the reference line is calculated. And using this deviation amount as an evaluation index (classification index) of ankle joint dynamic alignment eliminates elements determined by the operator's operation, and errors due to the operator's subjective operation are less likely to occur. In addition, the evaluation result can be output in a short time.

The ankle joint dynamic alignment evaluation system according to the present invention includes the subject 's foot when the subject performs a running / walking motion performed in such a manner that the sole of the foot is sequentially grounded from the heel to the toe. the calculated and measuring apparatus for measuring the load distribution for each predetermined measurement period of the back, the measured position of the load center of the load distribution for each measurement time, based on the position of the computed load center, a series of A load center trajectory in a running / walking motion is determined, and an arithmetic unit that calculates a deviation amount of the load center trajectory with respect to a linear reference line set from the heel side to the toe side is provided.

  According to this configuration, the load distribution on the sole of the person to be measured is measured with the measuring device, the locus of the load center in the measured load distribution is calculated, and the deviation amount of the load center with respect to the reference line is calculated with the calculation device. In addition, by using this deviation amount as an evaluation index (classification index) of the dynamic alignment of the ankle joint, there is no element determined by the operator's operation, and errors due to the operator's subjective operation are less likely to occur, Evaluation results can be obtained in a short time.

  According to the present invention, human error due to the subjective operation of the operator is less likely to occur, and the dynamic alignment of the ankle joint can be evaluated in a short time.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out an ankle joint dynamic alignment evaluation system and ankle joint dynamic alignment evaluation method according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, an ankle joint dynamic alignment evaluation system (hereinafter simply referred to as an “evaluation system”) includes a measuring device 1 that measures the pressure distribution on the sole (plantar) when the foot is placed on the , A calculation device 2 that performs a predetermined calculation based on the pressure distribution data measured by the measurement device 1, a display device 3 that displays the measured pressure distribution and the calculation result of the calculation device 2, and the dynamic alignment of the ankle joint A storage device 4 is provided for storing data such as criteria necessary for the evaluation.

  As shown in FIG. 2, the measuring device 1 includes a sensor sheet 1 a placed on a floor or the like. When the foot is placed on the upper surface of the sensor sheet 1a, the pressure of each part of the sole can be measured by a plurality of sensors (measurement points) provided in a grid pattern in the plan view. The measuring device 1 is connected to the arithmetic device 2 via a connection cord or wireless communication.

  The measuring device 1 performs a running / walking motion performed in such a manner that the person to be measured sequentially touches the soles of the feet from the heel to the toes and puts the feet on the sensor sheet 1a for a certain measurement time (for example, about It can be measured every 17 msec). The pressure distribution data measured by the measuring device 1 is transmitted to the arithmetic device 2, and the arithmetic device 2 displays the pressure distribution data on the display device 3 as image data. Hereinafter, each piece of pressure distribution data measured at each measurement time is collectively referred to as a “frame”. The measuring device 1 can measure pressure distribution data for about 30 frames, for example, when measuring a single running / walking motion.

  For example, a computer such as a so-called personal computer is used as the arithmetic device 2. The arithmetic device 2 is installed with software for displaying a pressure distribution on the display device 3 as image data and performing a predetermined calculation necessary for evaluating the dynamic alignment of the ankle joint. The arithmetic device 2 includes a central processing unit (CPU) 2a that performs various arithmetic operations, a memory 2b that stores measurement results of pressure data of the soles measured by the measuring device 1, and a pressure measured by the measuring device 1. A pressure distribution calculation unit 2c for calculating a pressure distribution based on the data, a pressure center calculation unit (COP calculation unit) 2d for calculating a pressure center (Center Of Pressure (COP)) based on the pressure data, and a step based on the pressure data. An index calculation unit (ankle joint behavior index calculation unit) 2e that calculates an index for determining the dynamic alignment of the joint is provided.

  A monitor such as a liquid crystal display is used for the display device 3. The display device 3 is connected to the arithmetic device 2, and displays an image for each frame or displays a maximum pressure distribution at each measurement point (sensor) of a plurality of frames via the arithmetic device 2. be able to.

  FIG. 3 shows image data F (hereinafter, this image data is referred to as “pressure distribution diagram”) F when the maximum pressure distribution at each measurement point (sensor) in a plurality of frames is displayed on the display device 3. In the present embodiment, for example, the pressure distribution diagram F is drawn using frames from the first frame to the third frame before the last frame.

  In the pressure distribution diagram F, the shape of the sole of the person to be measured is projected on the display device 3, and the pressure level of the sole is displayed. In this pressure distribution diagram F, the high pressure portion and the low pressure portion are displayed in different colors (for example, the lower the pressure, the blue, the amber color is displayed, and the higher the pressure, the yellow, the red, etc. The pressure level can be visually discriminated.

  As shown in FIG. 3, in the pressure distribution diagram F displayed on the display device 3, a linear reference line M is drawn from the heel side to the toe side of the sole. In the present embodiment, the reference line M displayed on the display device 3 is drawn so as to overlap with the pressure distribution diagram F, and the end portion Fb of the heel portion is extended from the end portion Fa of the second heel of the sole. It is drawn in a straight line to connect. Further, the evaluation system can set the reference line virtually by the arithmetic device 2 without displaying it on the display device 3.

  Further, the computing device 2 can obtain a point (hereinafter referred to as “pressure center”) where the pressure is balanced among the pressure distribution in each frame. Specifically, the center of pressure has an X axis and a Y axis orthogonal to the center sheet, and the pressures of sensors provided in a grid pattern at equal intervals in the X axis direction and the Y axis direction, and each sensor Is calculated using the coordinates on the X axis and the Y axis. The position of the pressure center calculated by the calculation device 2 is obtained in both the X-axis direction and the Y-axis direction. For example, the coordinates of the pressure center in the X-axis direction are determined by calculating the product of the pressure measured by each sensor and the coordinate position of each sensor in the X-axis direction, and this value becomes equal on the X-axis. The Also, the coordinates of the pressure center in the Y-axis direction are specified by calculating the product of the pressure measured by each sensor in the Y-axis direction and the coordinate position of each sensor, and this value becomes equal on the Y-axis. . In general, the Y axis is set so as to substantially match the traveling direction when the measurement subject performs a running / walking motion.

The position (coordinates) of the pressure center on the X axis and the Y axis can be obtained by the following equation.

  This equation takes the X and Y axes perpendicular to each other on the sensor sheet, and the X axis is based on the pressure measured by a sensor (measurement point) provided in a grid pattern on the sensor sheet at predetermined coordinates. This is for obtaining the position (coordinates) of the pressure center in each of the Y-axis.

  In this equation, “Xcop” is the position (coordinates) of the pressure center on the X axis, and “Ycop” is the position (coordinates) of the pressure center on the Y axis. “Xn” and “Yn” are sensor numbers on the X axis and Y axis, respectively, and “Pij” is the sensor pressure at each coordinate. Further, “i” indicates a coordinate number (coordinate position) on each sensor X axis, and “j” indicates a coordinate number (coordinate position) on the Y axis of each sensor.

  The computing device 2 determines (calculates) a pressure center locus N (see FIG. 3) in a series of running / walking motions of the measurement subject based on the pressure center computed in each frame, and displays it on the display device 3. be able to.

  As shown in FIGS. 3 and 4, the trajectory N of the pressure center intersects the reference line M at one location (this intersection is indicated by a symbol Z), and a part of the trajectory N sandwiches the reference line M. It is located on one side in the left-right direction (left side of the reference line M in FIG. 4), and the other part is located on the other side of the reference line M (right side of the reference line M in FIG. 4). The trajectory N of the pressure center may intersect the reference line M at two places or may not intersect the reference line M depending on the shape of the trajectory, the setting of the position of the reference line M, and the like.

  One end of the pressure center (corresponding to the pressure center calculated in the first frame, hereinafter referred to as “first end”) 5 is one side (reference line M) across the reference line M. The other end of the pressure center (corresponding to the pressure center calculated in the third frame before the last frame, hereinafter referred to as “second end”) 6 is a reference line It is located on the other side in the left-right direction (right side of the reference line M) across M.

  As shown in FIG. 4, the first end portion 5 of the pressure center locus N is in contact with a linear auxiliary line (hereinafter referred to as a “first auxiliary line”) 7 drawn perpendicular to the reference line M. Yes. The second end 6 of the pressure center locus N is in contact with an auxiliary line 8 (hereinafter referred to as a “second auxiliary line”) drawn perpendicular to the reference line M.

  As shown in FIG. 4, on one side in the left-right direction across the reference line M, an area surrounded by the pressure center locus N, the reference line M, and the first auxiliary line 7 (hereinafter referred to as “first area”). 9 is displayed. An area (hereinafter referred to as “second area”) 10 surrounded by the pressure center locus N, the reference line M, and the second auxiliary line 8 is displayed on the other side in the left-right direction across the reference line M. Yes.

  The calculation device 2 can calculate how much the locus N of the pressure center deviates from the reference line M (how much it deviates) and the deviation amount. This deviation amount is calculated as, for example, the area of a region surrounded by the reference line M and the locus N of the pressure center. In the present embodiment, a value (A1-A2) obtained by subtracting the area (A2) of the second region 10 from the area (A1) of the first region 9 is the deviation amount.

  The arithmetic device 2 calculates the area of the area surrounded by the pressure center locus N of the reference line M, and then performs an operation of dividing the area value by an amount corresponding to the size of the foot of the person to be measured. It has become. Here, the “amount according to the size of the foot” means the length of the subject's foot, the width of the foot, the area of the sole, the size of the shoe, and other amounts. For example, when the calculation device 2 calculates the area of the region surrounded by the reference line M and the pressure center locus N, the value of the area (A) is divided by the length (α) of the person to be measured. A value (X = (A / α) × 100 (%)) is obtained. Hereinafter, this value X is referred to as “area ratio”. The area ratio is calculated because there is an individual difference in the size of the foot for each person to be measured, so the area is normalized so that this individual difference does not affect the evaluation of the dynamic alignment of the ankle joint. This is for (normalization).

  The computing device 2 can evaluate the dynamic alignment of the ankle joint according to the area ratio value. The dynamic alignment of the ankle joint is classified into three types, for example, overpronation, neutral, and underpronation based on the area ratio value.

  In the storage device 4, based on the measurement result of the measuring device 1, the calculation device 2 can be classified into overpronation, neutral, and underpronation, so that the corresponding reference (ankle joint behavior classification table 4 a ) Is stored. That is, in the storage device 4, a table of area ratio threshold values necessary for classifying the area ratio obtained by the calculation of the calculation apparatus 2 into overpronation, neutral, and underpronation is preset and stored. Has been. With respect to this threshold value, in this embodiment, the area ratio (X) is less than 25% (X <25), and the area ratio (X) is 25% or more and less than 50% (25 ≦ X <50). ) Is neutral, and the area ratio (X) is 50% or more (X ≧ 50).

  The evaluation system is not limited to the case where the area of the region formed by the reference line M and the locus N of the pressure center is used as a classification index for the dynamic alignment of the ankle joint. Evaluation can be made.

  That is, the arithmetic unit 2 can also use the maximum value L of the interval between the reference line M and the pressure center locus N as the deviation amount of the pressure center locus N with respect to the reference line M. Here, the “maximum value of the distance between the reference line M and the center of pressure” L is the reference in the portion of the locus located on one side (left side) in the left-right direction across the reference line M, as shown in FIG. The distance L1 from the reference line M at the position B1 of the pressure center locus N farthest from the line M and the portion of the pressure center locus N located on the other side (right side) of the reference line M are farthest from the reference line M. The sum (L1 + L2) of the distance L2 from the reference line M at the position B2. Further, the “maximum value of the distance between the reference line M and the pressure center locus N” when the pressure center locus N does not intersect the reference line M is the pressure center locus at the position farthest from the reference line M. The distance between N and the reference line M.

  The arithmetic device 2 obtains a value Y obtained by dividing the maximum value L of the interval between the reference line M and the pressure center locus N by an amount (for example, foot length α) corresponding to the size of the foot of the person being measured. (Y = (L / α) × 100 (%)) is classified into any one of overpronation, neutral and underpronation based on a preset reference (threshold). The threshold value as a reference is stored in the storage device 4 as a classification table 4a. As for this threshold value, for example, when this value Y is less than 4% (Y <4), overpronation is performed, and when this value Y is 4% or more and less than 8% (4 ≦ Y <8), this is neutral. The case where the value Y is 8% or more (Y ≧ 8) is set in advance as underpronation.

  Hereinafter, an evaluation method of ankle joint dynamic alignment using an evaluation system will be described with reference to FIG. In order to evaluate the dynamic alignment of the ankle joint using the evaluation system, first, the person to be measured performs a running / walking motion and places one leg on the sensor sheet 1a of the measuring apparatus 1. Then, the measuring device 1 measures the pressure distribution of the foot placed on the sensor sheet 1 a and transmits the result to the computing device 2. As shown in FIG. 5, the computing device 2 computes the pressure distribution based on the data for each frame of the pressure distribution transmitted from the measuring device 1 (S1).

  The computing device 2 computes the pressure center from the data of each frame of the pressure distribution (S2), and computes and determines the pressure center locus N based on the position of the pressure center computed for each frame. Then, the computing device 2 causes the display device 3 to display the pressure distribution diagram F, the reference line M, and the pressure center locus N (S3). And the arithmetic unit 2 determines (sets) the reference line M with respect to the pressure distribution map F (S4).

  Further, the computing device 2 obtains a deviation amount of the locus N of the pressure center with respect to the reference line M by computation (S5). When the deviation amount is the area of the region formed by the reference line M and the locus N of the pressure center, the calculation device 2 determines the amount corresponding to the area and the size of the foot of the person to be measured (for example, the length of the foot). ) And the area ratio is calculated (calculated) (S5). Note that the length of the foot of the person to be measured may be obtained by inputting the length of the foot measured in advance as data to the computing device 2, or the toe of the foot displayed in the pressure distribution diagram F The length of the reference line M from the (second heel end portion Fa) to the heel end portion Fb may be calculated by the calculation device 2 and this value may be used as the “foot length”.

  In addition, the arithmetic unit 2 sets (determines) the first auxiliary line 7 and the second auxiliary line 8 as appropriate according to the positional relationship between the reference line M and the locus N of the pressure center, and draws it on the pressure distribution diagram F. . Further, in this evaluation system, the first auxiliary line 7 and the second auxiliary line 8 are drawn by the calculation of the arithmetic device 2, but in addition, the first auxiliary line 7 can be generated by the operation of the operator (for example, the operation of the mouse or the like). The second auxiliary line 8 can be displayed in the pressure distribution diagram F.

  The computing device 2 collates the values such as the area ratio obtained by the above computation with the classification table 4a stored in the storage device 4 (S6), and based on the threshold value of the classification table 4a, Classify as Nation, Neutral, or Under Pronation. When the classification of the dynamic alignment of the ankle joint is completed, the arithmetic device 2 displays the evaluation result on the display device 3 (S7).

  As shown in FIG. 6, the evaluation result is displayed in one image (window) together with the area of the region formed by the reference line M and the pressure center locus N and the length of the foot. The operator of the evaluation system selects shoes, insoles, etc. suitable for the measurement subject according to the evaluation result.

  According to the evaluation system and the evaluation method according to the present embodiment described above, the measurement device 1 measures the pressure distribution on the sole of the person to be measured, and based on the pressure distribution data, the calculation device 2 uses the reference line. By determining M and the pressure center locus N and calculating the deviation amount of the pressure center locus N with respect to the reference line M, errors due to the subjective operation of the operator are less likely to occur. It is possible to calculate up to the evaluation result of the dynamic alignment of the ankle joint in time. In addition, this evaluation system does not require specialized knowledge and can be easily operated, so that it does not easily cause errors as in the prior art.

  Further, the evaluation system can calculate the evaluation result in a shorter time by calculating the deviation amount as the area of the region formed by the reference line M and the pressure center locus N.

  The evaluation system classifies the evaluation system based on the value obtained by dividing the area as the deviation amount by the length of the foot of the person being measured, thereby standardizing the deviation amount (area) as the evaluation index of the evaluation system. The dynamic alignment of the subject's ankle joint can be evaluated (classified) regardless of the size of the subject's foot.

  Further, the evaluation system adopts the maximum value of the interval between the reference line M and the pressure center locus N as the deviation amount of the pressure center locus N with respect to the reference line M, and calculates this by the arithmetic unit 2. Errors due to the subjective operation of the operator are unlikely to occur, and an evaluation result can be output in a short time. Then, by dividing the maximum value of the distance between the reference line M and the pressure center by the length of the measurement subject's foot, the ankle joint of the measurement subject regardless of the size of the measurement subject's foot. The surrounding dynamic alignment can be evaluated (classified).

  Further, since the evaluation system includes the display device 3 capable of displaying the pressure center locus N and the reference line M, the operator visually grasps the tendency of the deviation of the pressure center locus N with respect to the reference line M. become able to.

  In addition, the evaluation system is such that the arithmetic device 2 calculates a value (area ratio) obtained by dividing the area as the deviation amount by the length of the foot of the person to be measured based on a preset criterion, overpronation, neutral, By classifying underpronation, the dynamic alignment of the ankle joint can be evaluated regardless of the size of the subject's foot.

  In the evaluation system, the arithmetic unit 2 calculates the value obtained by dividing the maximum value L of the interval between the reference line M as the deviation amount and the locus N of the pressure center by the length of the foot of the person to be measured. By using this as an evaluation index of the target alignment and calculating it by the calculation device 2, an error due to the subjective operation of the operator is unlikely to occur, and the evaluation result can be obtained in a short time.

  Further, by dividing the maximum value L of the distance between the reference line M as the deviation amount and the trajectory N of the pressure center by an amount corresponding to the size of the foot of the person to be measured, Regardless of the size of the foot, the dynamic alignment of the subject's ankle joint can be evaluated (classified).

  In addition, this invention is not restricted to said embodiment, A various change and deformation | transformation are possible.

  For example, in the above-described embodiment, an example in which the evaluation system is classified into three types of overpronation, neutral, and underpronation has been described. ”And“ overpronation ”, or“ neutral ”and“ underpronation ”, or“ overpronation ”and“ underpronation ”), or 4 It is also possible to classify into two or more (for example, “overpronation”, “overproration or neutral”, “neutral”, “underpronation or neutral”, “underpronation”) .

  When the area ratio is used as a classification index for ankle joint dynamic alignment and the ankle joint dynamic alignment is classified into five, for example, as the threshold value, the area ratio (X) is less than 15% (X <15). ) Is “overpronation”, the area ratio (X) is 15% or more and 25% or less (15 ≦ X ≦ 25), and the area ratio (X) exceeds 25% When the ratio is less than 40% (25 <X <40), the area ratio (X) is 40% or more and 50% or less (40 ≦ X ≦ 50). A case where X) exceeds 50% (X> 50) may be set as “under-pronation”.

  Further, a value (Y) obtained by dividing the maximum value L of the distance between the reference line M and the center of pressure by an amount corresponding to the size of the foot of the person to be measured is used as a classification index for dynamic alignment of the ankle joint. Is classified into five as the threshold value, for example, when this value (Y) is less than 3% (Y <3), this value (Y) The case of 3% or more and 5% or less is “overpronation or neutral”, and this value (Y) is over 5% and less than 8% (5 <Y <8). 8% or more and 10% or less (8 ≦ Y ≦ 10) is set as “neutral or underpronation”, and when this value (Y) exceeds 10% (Y> 10), “underpronation” is set. It may be.

  In the above-described embodiment, the evaluation system includes the display device 3 that can display the reference line M and the locus N of the pressure center. However, the calculation result (evaluation result) can be used without using the display device 3. The calculation device 2 may be configured to be notified by various methods such as sound and lighting of an indicator lamp.

  In the above-described embodiment, an example in which the reference line M is set so as to overlap the pressure distribution diagram F by the arithmetic device 2 has been described. However, the reference line M does not overlap the pressure distribution diagram F, but at a predetermined distance. It may be set at a position away from the pressure distribution diagram F. In the above embodiment, the reference line M is set so as to pass through the second heel end portion Fa and the heel end portion Fb of the foot shown in the pressure distribution diagram F. It may be set at an arbitrary inclination angle.

  In the above embodiment, the area ratio (X) is less than 25% (X <25) as the area ratio threshold for classification of the evaluation system, and the area ratio (X) is 25% or more. An example is shown in which the case of less than 50% (25 ≦ X <50) is neutral, and the case where the area ratio (X) is 50% or more (X ≧ 50) is under-pronation, but is not limited to these values. .

  Further, in the above embodiment, as an index for classification of the evaluation system, the maximum value L of the interval between the reference line M and the pressure center locus N is an amount corresponding to the size of the measurement subject's foot ( For example, the value Y (Y = (L / α) × 100 (%)) divided by the foot length α) is shown, and the value Y is less than 4% (Y <4). An example is shown in which pronation is classified as neutral when this value Y is 4% or more and less than 8% (4 ≦ Y <8), and under pronation when this value Y is 8% or more (Y ≧ 8). However, it is not limited to these values.

  In the above-described embodiment, the evaluation system in which the measurement device 1, the calculation device 2, and the display device 3 are separated is illustrated. However, the evaluation system is not limited to this, and the calculation device 2 is incorporated in the measurement device 1. The measurement device 1 may be integrated with the arithmetic device 2 and the display device 3. Further, the storage device 4 may be integrated into the arithmetic device 2.

  Further, the evaluation system can classify the dynamic alignment of the ankle joint based on the radius of curvature of the locus N of the pressure center. That is, the calculation device 2 can calculate the curvature radius when the pressure center locus N is indicated by a curve. The calculation device 2 can obtain the curvature radius by calculation, and classify the result into one of overpronation, neutral, and underpronation based on a preset threshold (reference).

Further, the length of the trajectory of the pressure center (trajectory length) is calculated by the calculation device 2, and the classification of the dynamic alignment of the ankle joint (overpronation, neutral, Classification of underpronation) may be performed.
In the above embodiment, the measuring apparatus 1 measures one frame at a predetermined time (17 msec) and measures a predetermined number of frames (about 30 frames). The measurement time and the number of frames can be changed and adjusted as appropriate.

  Further, in the above embodiment, the pressure distribution of the sole when the measurement subject performs a running / walking motion is measured by the measurement device 1, and the pressure center and the locus N of the pressure center are measured based on the pressure distribution data. However, the present invention is not limited to this, and the load distribution of the sole when the subject performs a running / walking motion is measured by the measurement device, and the load center is calculated based on the data of the load distribution. (Center Of Force (COF)) and the locus of the load center are calculated by the calculation device, and the deviation amount between the load center and the reference line M is dynamically aligned based on a predetermined reference (for example, a threshold value). You may make it evaluate. In this case, the position of the load center can be calculated by the calculation device 2 by applying the calculation formula of the pressure center shown in the above embodiment.

  In the above embodiment, when the area of the region formed by the reference line and the locus of the pressure center is obtained, a value obtained by subtracting the area (A2) of the second region 10 from the area (A1) of the first region 9 ( Although A1-A2) was used as the deviation amount (area), the sum (A1 + A2) of the area (A1) of the first region 9 and the area (A2) of the second region 10 was determined according to the size of the measurement subject's foot. The value divided by the amount may be used as the area ratio. Alternatively, the area ratio is a value obtained by dividing the area (A1) of the first region 9 and the area (A2) of the second region 10 and dividing the larger one by the amount corresponding to the size of the foot of the person being measured. It may be used.

  In the above embodiment, the maximum value L of the distance between the reference line M and the pressure center is the largest from the reference line M in the portion of the locus located on one side (left side) in the left-right direction across the reference line M. The distance L1 from the reference line M in the position B1 of the separated pressure center locus N and the position B2 farthest from the reference line M in the portion of the pressure center locus N located on the other side (right side) of the reference line M. Although it was the sum (L1 + L2) with the distance L2 from the reference line M, the present invention is not limited to this, and the larger value is obtained by comparing the distance L1 and the distance L2, and the maximum value of the distance between the reference line M and the pressure center. It is good also as L. Further, the difference (L1−L2) between the distance L1 and the distance L2 can be used as the maximum value L of the distance between the reference line M and the pressure center.

It is the schematic of the evaluation system of the dynamic alignment of the ankle joint based on this invention. It is a perspective view which shows the measuring apparatus in the evaluation system of the dynamic alignment of an ankle joint. It is the pressure distribution map displayed on the display apparatus in the evaluation system of the dynamic alignment of an ankle joint. It is a figure which shows the locus | trajectory of a reference line and a pressure center. It is a flowchart which concerns on evaluation of the dynamic alignment of an ankle joint by the evaluation system of the dynamic alignment of an ankle joint. It is an example of the calculation result of the dynamic alignment of the ankle joint displayed on a display device. It is a rear view around the joint of the foot for explaining overpronation. It is a rear view around the joint of the leg for explaining neutral. It is a rear view around the joint of the foot for explaining underpronation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus, 2 ... Arithmetic apparatus, 3 ... Display apparatus, 4 ... Memory | storage device, M ... Reference line, N ... Trajectory of pressure center

Claims (10)

A measuring device that measures the pressure distribution on the sole of the subject at a predetermined measurement time when the subject performs a running / walking motion performed in a mode in which the sole of the foot is sequentially grounded from the heel to the toe; calculates the measured position of the pressure center of the pressure distribution for each measurement time, based on the position of the computed pressure center, together to determine the trajectory of the pressure center in a series of run walking, toe heel An ankle joint dynamic alignment evaluation system comprising: an arithmetic unit that calculates a deviation amount of a locus of the pressure center with respect to a linear reference line set toward the side.   The ankle joint dynamic alignment evaluation system according to claim 1, wherein the deviation amount is calculated as an area of a region formed by a reference line and a pressure center locus.   The ankle joint dynamic alignment evaluation according to claim 2, wherein the ankle joint dynamic alignment is classified based on a value obtained by dividing the area as the deviation amount by an amount corresponding to a size of the foot of the measurement subject. system.   The ankle joint dynamic alignment evaluation system according to claim 1, wherein the deviation amount is calculated as a maximum value of an interval between a reference line and a pressure center locus.   5. The ankle joint dynamic alignment is classified based on a value obtained by dividing the maximum value of the distance between the reference line and the pressure center as the deviation amount by an amount corresponding to the size of the foot of the person to be measured. Evaluation system for dynamic alignment of ankle joints.   The ankle joint dynamic alignment evaluation system according to claim 1, further comprising a display device capable of displaying a locus of the pressure center and a reference line.   The arithmetic unit is a value obtained by dividing the area as the deviation amount by an amount corresponding to the size of the foot of the person to be measured, and is any one of overpronation, neutral and underpronation based on a preset criterion. The ankle joint dynamic alignment evaluation system according to claim 3, which is classified into one.   The arithmetic unit calculates a value obtained by dividing the maximum value of the distance between the reference line as the deviation amount and the center of pressure by an amount corresponding to the size of the foot of the person to be measured, based on a preset criterion. The ankle joint dynamic alignment evaluation system according to claim 5, wherein the system is classified into any one of, neutral and underpronation. Measure the pressure distribution on the sole of the subject 's foot when the subject performs a running / walking motion performed in a manner in which the sole of the foot is sequentially grounded from the heel to the toe with a measuring device at predetermined time intervals, It calculates the position of the center of pressure measured the pressure distribution in each time arithmetic unit, based on the position of the computed pressure center, to determine the trajectory of the pressure center in a series of run walking by the arithmetic unit, the heel A method for evaluating an ankle joint dynamic alignment, comprising: calculating a deviation amount of the locus of the pressure center with respect to a linear reference line set from a side to a toe side by a computing device. A measuring device for measuring the load distribution on the sole of the subject at a predetermined measurement time when the subject performs a running / walking motion performed in a manner in which the sole of the foot is sequentially grounded from the heel to the toe; calculates the position of the load center of the measured the load distribution for each measurement time, based on the position of the computed load center, as well as determine the trajectory of the load center in a series of run walking, toe heel An ankle joint dynamic alignment evaluation system comprising: an arithmetic unit that calculates a deviation amount of the locus of the load center with respect to a linear reference line set toward the side.

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