JP4599944B2 - Shoulder joint rotation angle measuring instrument - Google Patents

Description

  The present invention relates to a rotation angle measuring method for measuring the angle of internal / external rotation of a shoulder joint and a measuring instrument therefor.

Measurement of the internal and external rotation angles of the shoulder joint is required to ascertain the degree of disease or injury related to the shoulder joint and their recovery state.
According to the conventional shoulder joint rotation angle measuring device or measurement method, the arm is maintained with the elbow (joint) bent forward at a right angle, and the upper arm is twisted so that the forearm rotates to the trunk side in this state ( (Inner rotation), and the upper arm is twisted (external rotation) so that the forearm moves away from the trunk, and the rotation angle at that time is measured by a scale portion (see Patent Document 1 described later).

According to the knowledge of the inventors, when measuring the angle of internal rotation / external rotation, it is possible to twist the arm as described above with the elbow extended along the side of the trunk and measure the rotation angle. Necessary for accurate measurement. Because, when the elbow is bent, even if the shoulder joint is rotated inward, the forearm hits the trunk and cannot perform internal rotation until the end. It is because it is not possible.
That is, in the conventional measuring instrument or measurement method, the elbow is bent at a right angle during measurement, so that the elbow is positioned in front of the trunk side to avoid the forearm hitting the trunk during internal rotation measurement. Therefore, the upper arm is inclined with respect to the trunk (or the trunk is inclined with respect to the upper arm), so that the internal rotation angle cannot be measured accurately.
JP-T 9-501575

  The problems to be solved by the present invention are a method for measuring a rotation angle of a shoulder joint that can accurately measure both internal and external rotation, and the measurement method can be smoothly and reliably carried out. It is to provide a simpler shoulder angle measuring device.

The shoulder joint rotation angle measuring method and the rotation angle measuring device according to the present invention are configured as follows in order to solve the above-described problems.
That is, the rotation angle measuring method according to the present invention is characterized in that the internal / external rotation angles are measured in a state where the elbow b is extended along the trunk side portion of the measurement subject a.

  The rotation angle measuring instrument according to the present invention is used by being positioned substantially orthogonal to the front part of the elbow b extending along the trunk side of the person to be measured during internal rotation measurement. A measuring plate 1 having a scale display unit 10 having a planar shape that does not interfere with the trunk of the person a and a center indicating piece 11 that brings the front center of the front part of the elbow b of the person to be measured a into contact with the tip during measurement. The measurement plate 1 has a notch-shaped guide portion 12 for guiding at least a part of the elbow b of the measurement subject a to the side portion of the center indicating piece 11 at the time of internal rotation measurement. The most important feature is that an angle scale 10a centered on the base point 11a at the tip of the center indicating piece 11 is displayed.

According to the method for measuring the rotation angle of the shoulder joint according to the present invention, the rotation angle is measured in a state where the elbow b is extended along the trunk side portion of the person to be measured a, so that the internal rotation is measured more accurately. be able to.
Similarly, the external rotation can be measured in the elbow extension position.

  According to the shoulder joint rotation angle measuring device according to the present invention, an appropriate angle indicating bar (a rod-shaped object such as a pencil or a mechanical pencil) is used so as to be orthogonal to the front portion of the elbow b using an elastic band or the like in the elbow extension position. The elbow b of the person to be measured a is bent once at a right angle from the extended position (at this time, it is preferable to bend it flexibly to maintain the stability of the angle indicating bar with respect to the elbow b). The forearm is positioned forward so that it is perpendicular to the trunk, and the shoulder joint is in the middle / outer rotation position (inner / outer rotation 0 °). From this state, the elbow b is extended, the measuring plate 1 is arranged so as to be orthogonal to the front part of the elbow b, and the tip of the center indicating piece 11 is brought into contact with the center of the front part of the elbow b. Can be smoothly carried out without causing the forearm to interfere with the trunk, by reading the scale on the scale display unit indicated by the angle indicator bar, The internal rotation angle can also be measured accurately.

First Embodiment FIG. 1 shows a first embodiment (for a right shoulder joint) of a rotation angle measuring device according to the present invention. FIG. 2 is a plan view for explaining the point of internal rotation measurement by the measuring device, and FIG. It is a top view for demonstrating the point of external rotation measurement with the rotation angle measuring device of one Embodiment.
The measuring plate 1 is composed of a scale display unit 10 and a central indicating piece 11 which are integrally formed of a cardboard, a plastic, a metal, a wood plate, or other hard material to some extent. It is used while being kept substantially orthogonal to the front part of the elbow b extended along the side of the trunk.
In this embodiment, a measurement person (not shown) holds the measurement plate 1 in the above-mentioned state, but the measurement plate 1 is attached to the stable support (not shown) so that it can be removed horizontally and is in the above state. Can be kept in. In this case, the column is composed of a large-diameter pipe and a small-diameter pipe that is partially inserted into the pipe and slides, and the small-diameter pipe is slid and fixed to the large-diameter pipe with screws or the like. It is preferable that the length (height) of the column can be adjusted as appropriate.

The scale display unit 10 is formed in a planar shape that does not interfere with the trunk of the person to be measured a when measuring the internal rotation in the above state, and the center indicating piece 11 has an extended shape of the tip of the person a at the time of measurement. It protrudes so as to extend in the direction of the elbow b. In this embodiment, the notch-like portion 13 is formed by notching the portion of the scale display unit 10 so that the portion facing the front of the trunk of the person to be measured a does not hit the trunk when measuring the internal rotation. is doing.
A notch-shaped guide portion 12 is formed on the measurement plate 1 so that a part of the elbow b extended by the person to be measured a is guided to the side portion of the center indicating piece 11 during the internal rotation measurement.
In this embodiment, the planar shape of the measuring plate 1 is almost square as a whole, and a square plate having an appropriate size is prepared, and a corner portion facing the front of the trunk when measuring internal rotation is cut out by a press or the like. At the same time as forming the notch 13, the notch guide 12 is formed on the side of the center indicating piece 11.
In the state at the time of internal rotation measurement (reference time) shown in the drawing, the end portion 10b on the right side of the scale display unit 10 is located right next to the front end portion of the center indicating piece 11 when viewed from the measurement subject a side. It is configured.

The scale display unit 10 displays an angle scale 10a centered on the base point 11a at the tip of the center indicating piece 11, and the end 10b located on the right side of the base point 11a of the center indicating piece 11 is measured during internal rotation. As a reference of 0 degrees, scale numbers 10c for measuring internal rotation are displayed in the left-turning direction for each predetermined angle scale.
At a position closer to the base point 11a than the scale number 10c for measuring the internal rotation, an appropriate position of the angular scale (in this embodiment, a position of 100 degrees of the internal scale for measuring the internal rotation) is measured at the time of external rotation measurement. A scale number 10d for measuring the external rotation is displayed in the clockwise direction for each predetermined angle scale as 0 degree as a reference.

  An angle indicating bar 2 that rotates in the horizontal direction around the base point 11a is attached to the distal end portion of the center indicating piece 11 so that it can be brought into contact with the front part of the elbow b of the measurement subject at the time of measurement. ing. The angle indicating bar 2 is preferably attached in a state where it is braked to some extent and does not rotate freely.

Hereinafter, the method for measuring the rotation angle of the right shoulder joint by the rotation angle measuring instrument of the first embodiment will be described together with the embodiment of the rotation angle measuring method.
First, the procedure for measuring internal rotation will be described.
The measurer, for example, does not stand up or bends the elbow b of the person to be measured hung on the chair at a right angle from the extended position, and the forearm is horizontally positioned forward (this operation accurately moves the front of the elbow b forward The rear arm is hung down, and the elbow b is extended along the side of the trunk as shown in the figure. At this time, the elbow b is positioned so that its front part faces straight forward.
Next, the measurer holds the scale display portion 10 of the measuring plate 1, aligns the tip of the angle indicating bar 2 with “0” of the scale number 10 c for measuring the internal rotation, and the tip of the center indicating piece 11 is measured. The measuring plate 1 is set in a state where it contacts the center of the front of the elbow b of the person a and the center indicating piece 11 is orthogonal to the front of the elbow b. In this state, the to-be-measured person a twists the elbow b inward (in the trunk direction) to the limit (for example, the position of the two-dot chain line) and reads the angle scale indicated by the tip of the angle indicating bar 2.

Next, the outline of external rotation measurement will be described.
After the measurement person prepares the preparation posture of the person to be measured as in the case of the internal rotation measurement, the measurement plate 1 is held in his hand, and the angle indicating bar 2 has its tip at the time of external rotation measurement as shown in FIG. The angle indicating bar 2 is orthogonal to the front part of the elbow b of the person to be measured a, and the tip of the center indicating piece 11 contacts the front center of the elbow b in accordance with “0” which is the reference of the scale number 10d for use. Set the measuring plate 1 in the state. In this state, the to-be-measured person a twists the elbow b outward to the limit, and the angle scale indicated by the tip of the angle indicating bar 2 is read.

According to the rotation angle measuring method and the rotation angle measuring instrument of the above embodiment, the internal rotation can be measured in a state where the elbow b of the person to be measured a is extended along the trunk side part. The turning angle can be measured accurately.
The measuring instrument is simple in configuration, can be manufactured at a lower cost, and is easy to operate.

Second Embodiment FIG. 3 shows a second embodiment (for the left shoulder joint) of a rotation angle measuring device according to the present invention, and is a plan view for explaining the point of internal rotation measurement by the measuring device.
In the rotation angle measuring device of this embodiment, the measurement plate 1 displays the angle scale 10a and the scale numbers 10c and 10d on the back surface of the measurement plate 1 of the rotation angle measurement device of the first embodiment (first). The measurement plate 1 is only symmetrical with respect to the measurement plate 1 of the measuring instrument according to the first embodiment. Description is omitted and only different points are described.
In this embodiment, an angle indicating bar 2 is provided that is attached so as to go straight to the front of the elbow b of the person to be measured a during measurement. The angle indicating bar 2 is preferably attached to the front portion of the elbow b by, for example, a rubber band, a rubber band, a rubber string or other string 20.
In this embodiment, the outline or measurement method of internal rotation measurement and external rotation measurement using the same, and the operation effects thereof are the same as those in the case of the first embodiment, so that the description thereof is omitted.

Other Embodiments For example, as shown by a two-dot chain line to the end portion 10b of the measurement plate 1 in FIG. 1, the end portion 10b of the scale display portion 10 extending to the side of the elbow b is passed rearward through the side of the trunk. Furthermore, it can comprise so that it may extend, and the angle scale 10a can be displayed on this extended part.
When the scale display unit 10 of the measurement plate 1 is configured in this way, the size of the scale display unit 10 increases accordingly, but the measurement preparation state of the person to be measured a and the measurement plate 1 can be set to the inside / outside. The same posture can be used for both rotation measurements.

The angle indicating bar 2 shown in each figure is processed exclusively for the measuring instrument, but the angle indicating bar in FIG. 3 can be replaced with, for example, a pencil, a mechanical pencil, or a bar-shaped object existing in daily life space. The angle indicating bar 2 is not an essential component in the rotation angle measuring device according to the present invention.
As described above, it is preferable to use the measurement plate 1 having a square shape as a whole as described above, but the measurement plate 1 can be implemented even if it is not such a shape. In addition, the notch 13 for avoiding interference between the scale display unit 10 of the measurement plate 1 and the trunk of the person to be measured a at the time of measurement is not inclined (triangular) as described above, but with the trunk. Other planar shapes may be used as long as interference can be avoided.

  In the above embodiment, the measurement plate 1 of the rotation angle measuring device for the left shoulder joint uses the back surface of the measurement plate 1 of the rotation angle measurement device for the right shoulder joint, but the rotation angle for the left and right shoulder joints. As the measuring plate 1 of the measuring device, a separately processed plate can be used.

It is a top view which shows the reference | standard state at the time of the internal rotation measurement which uses the rotation angle measuring device (for right shoulder joint) of 1st Embodiment which concerns on this invention. It is a top view which shows the reference | standard state at the time of external rotation measurement using the rotation angle measuring device (for right shoulder joint) of 1st Embodiment which concerns on this invention. It is a top view which shows the reference | standard state at the time of internal rotation measurement using the rotation angle measuring device (for left shoulder joint) of 2nd Embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement board 10 Scale display part 10a Angle scale 10b End part 10c, 10d Scale number 11 Center indication piece 11a Base point 12 Notch-shaped guide part 13 Notch-shaped part 2 Angle indication bar a Measured person b Elbow

Claims (5)

It is used by being positioned substantially orthogonal to the front part of the elbow (b) extending along the trunk side of the person to be measured (a) when measuring the internal rotation, and the body of the person (a) being measured when measuring the internal rotation A scale display section (10) having a planar shape that does not interfere with the trunk, and a center indicating piece (11) for bringing the front center of the front part of the elbow (b) of the measurement subject (a) into contact with the tip during measurement. A measuring plate (1) is provided, and at least a part of the elbow (b) of the person to be measured (a) is guided to the side of the center indicating piece (11) at the time of measuring the internal rotation. It has a notch-shaped guide part (12), and the scale display part (10) displays an angle scale (10a) centered on the base point (11a) of the tip of the center indicating piece (11). A shoulder joint rotation angle measuring device. The rotation angle measuring device according to claim 1 , further comprising an angle indicating bar (2) attached so as to be orthogonal to the front portion of the elbow (b) of the person (a) to be measured. An angle indicating bar (11) is placed on the center indicating piece (11) so as to be orthogonal to the front part of the elbow (b) of the person being measured (a) and rotating in the horizontal direction around the base point (11a) at the time of measurement. 2) is mounted, torsion angle measuring device of the shoulder joint of claim 1. The planar shape of the measuring plate (1) is a square as a whole, and the portion located in front of the trunk of the person to be measured (a) at the time of measuring the internal rotation forms an inclined portion from the tip of the central indicating piece (11). The rotation angle measuring device for a shoulder joint according to any one of claims 1 to 3 , wherein a notch (13) is formed. The said angle scale (10a) is the rotation angle measuring device of the shoulder joint in any one of Claims 1-4 currently displayed on both surfaces of the said scale display part (10).

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