JP5750289B2 - Evaluation system and evaluation method for dynamic characteristics of foot - Google Patents

Description

  The present invention relates to an evaluation system and an evaluation method for evaluating a dynamic characteristic of a human foot.

  Conventionally, various methods have been researched and developed in order to evaluate the characteristics of a runner's foot while walking or running. In general, the characteristics of a foot are roughly classified into a static property and a dynamic property of the foot.

  In particular, when evaluating the dynamic characteristics of the foot, for example, evaluation criteria such as “landing impact degree”, “buttock valgus angle”, and “crut internal rotation angle” are employed.

  For these evaluation criteria, for example, in order to evaluate the landing impact level, a method of measuring the load on the body of the running runner with an accelerometer attached to the shin is adopted.

  In addition, in order to evaluate the heel valgus angle, a method of continuously photographing and evaluating the position of the marker attached to the buttock or the shoe in the landing state of the runner's foot during running with a video camera or the like Is adopted. In addition, there is a method for measuring the load distribution acting on the sole of the foot while walking (or running) and evaluating the heel valgus angle by performing a predetermined calculation based on the load distribution data. It is adopted (see, for example, Patent Document 1).

  In addition, in order to evaluate the internal rotation angle of the lower leg, a method is used in which a runner is photographed with a three-dimensional analysis device or a plurality of video cameras, and a three-dimensional motion analysis is performed on the behavior of the foot. Yes.

JP 2009-11527 A

  In the conventional evaluation methods as described above, instruments and equipment necessary for measurement are complicated, and many of them are large. For this reason, measurement preparation and measurement itself take time, and the measurement locations are limited.

  This invention is made | formed in view of said situation, and makes it a subject to provide the system and method which can evaluate the dynamic characteristic of a leg simply and easily.

  The system for evaluating dynamic characteristics of a foot according to the present invention includes a load measuring means capable of measuring a foot load in the sitting position of the measured person and a foot load in the standing position of the measured person, and the sitting position of the measured person. Imaging means for acquiring an image of a side part of the foot in the position and an image of a side part of the foot in the standing position of the subject, and a side part of the foot in the sitting position and the standing position obtained by the imaging means Calculation means for calculating a scaphoid vertical change amount A of a subject's foot and a load change amount B between a seating load and a standing load in the subject. The means is characterized in that the value of B / A is calculated as the arch stiffness and the landing impact degree of the measurement subject's foot is evaluated based on the arch stiffness value.

  According to this configuration, the scaphoid vertical change amount A and the load change amount B are calculated by the calculation unit based on the foot image acquired by the imaging unit, and the value of B / A (arch stiffness) is calculated. The degree of landing impact of the foot can be evaluated. As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

In addition, the evaluation system for the dynamic characteristics of the foot according to the present invention includes an image of the buttocks of the foot from the back in the sitting position of the subject, and an image of the toes of the foot from the back in the standing position of the subject. Imaging means for obtaining the position of the subject's foot from the image of the back of the buttocks in the sitting and standing positions obtained by the imaging means, The calculating means includes a correlation between a pre-acquired change in the heel angle of each foot of the plurality of subjects and a pre-acquired buttock valgus angle of each of the plurality of subjects, and a calculated measurement target. The degree of heel valgus angulation of the person being measured is evaluated based on the amount of change in the heel angle of the person's foot.

  According to this configuration, by calculating the buttocks angle change amount by the calculation means based on the foot image acquired by the imaging means, it is possible to evaluate the toe valgus angle of the measurement subject's legs. . As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

Further, the dynamic characteristic evaluation system for a foot according to the present invention acquires an image of a side part of the foot in the sitting position of the subject and an image of a side part of the foot in the standing position of the subject. Imaging means for calculating, and calculating means for calculating the amount of vertical change in the scaphoid bone of the foot of the person to be measured from the images of the lateral sides of the foot in the sitting position and the standing position obtained by the imaging means, The means calculates the ratio of the scaphoid vertical variation of the subject's foot to the foot scaphoid vertical height in the sitting position, and the foot scaphoid vertical height in each sitting position of a plurality of subjects obtained in advance. The relationship between the ratio of the vertical change in the scaphoid bone to the height and the pre-obtained degree of rotation of the crus of each leg of the plurality of subjects, and the calculated vertical change in the scaphoid bone of the subject's foot the ratio of, based on, for evaluating the lower leg in旋角degree foot of the subject And wherein the door.

  According to such a configuration, based on the foot image acquired by the imaging unit, the scaphoid vertical change amount and the scaphoid shape of the foot of the person to be measured with respect to the scaphoid vertical height in the sitting position are calculated by the calculation unit. By obtaining the ratio of the amount of vertical bone change, it is possible to evaluate the internal rotation angle of the leg of the measurement subject. As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

  Further, the method for evaluating the dynamic characteristics of the foot according to the present invention measures the foot load in the sitting position of the measured person and the foot load in the standing position of the measured person by the load measuring means, The image of the inner side of the foot in the sitting position and the image of the inner side of the foot in the standing position of the measurement subject are acquired by the imaging unit, and the inner side of the foot in the sitting position and the standing position obtained by the imaging unit The scaphoid vertical change amount A of the measurement subject's foot and the load change amount B between the sitting load and the standing load of the measurement subject are calculated by the calculation means, and further, the calculation means , Calculating the value of B / A and evaluating the landing impact level of the foot of the person to be measured based on the value of B / A.

  According to this method, the scaphoid vertical change amount A and the load change amount B are calculated by the image processing of the foot image acquired by the imaging unit, and the value of B / A (arch stiffness) is calculated. Thus, the landing impact degree of the foot can be evaluated. As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

In addition, the method for evaluating the dynamic characteristics of the foot according to the present invention includes an image of the heel of the foot from the rear in the sitting position of the measured person, and an image of the heel of the foot from the rear in the standing position of the measured person. Is obtained by the imaging means, and from the image of the heel of the foot from the rear in the sitting position and the standing position obtained by the imaging means, the heel angle change amount of the to-be-measured person is calculated by the calculating means, and the calculating means Thus, the correlation between the heel angle change amount of each of the plurality of subjects acquired in advance and the heel valgus angle of each of the plurality of subjects acquired in advance, and the calculated foot of the subject to be measured Based on the amount of change in the buttock angle, the heel valgus angle of the measurement subject's foot is evaluated.

  According to this method, by calculating the buttocks angle change amount by the calculation means based on the foot image acquired by the imaging means, it is possible to evaluate the toe valgus valgus angle of the measurement subject's legs. . As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

Further, the method for evaluating the dynamic characteristics of the foot according to the present invention is to take an image of a side part of the foot in the sitting position of the measured person and an image of a side part of the foot in the standing position of the measured person. From the image of the inner side of the foot in the sitting position and standing position obtained by the imaging means, the scaphoid vertical change amount of the subject's foot is calculated by the calculating means, and the calculating means in the sitting position The ratio of the vertical change amount of the scaphoid bone of the measurement subject to the vertical height of the scaphoid bone of the foot is calculated, and the foot boat for the vertical height of the scaphoid bone of each of the subjects obtained in advance is calculated. The relationship between the ratio of the vertical change of the scaphoid and the pre-obtained degree of rotation of the lower leg of each of the plurality of subjects and the ratio of the calculated vertical change of the scaphoid of the foot of the measured person Based on the subject's foot leg internal rotation angle To.

  According to this method, based on the foot image acquired by the imaging means, the scaphoid vertical change amount and the scaphoid shape of the foot of the person to be measured with respect to the scaphoid vertical height in the sitting position are calculated by the calculation means. By obtaining the ratio of the amount of vertical bone change, it is possible to evaluate the internal rotation angle of the leg of the measurement subject. As described above, according to the present invention, by newly adopting an evaluation index that can be easily measured, the dynamic characteristics of the measurement subject's foot can be easily and easily evaluated.

  According to the present invention, the dynamic characteristics of the foot can be evaluated easily and easily.

1 is a block diagram schematically showing a foot dynamic characteristic evaluation system according to the present invention. FIG. It is the schematic which shows the aspect of imaging | photography of the leg by an imaging means. It is a figure which shows the image processing of the side part inside a leg | foot. It is a figure which shows the image processing of the buttocks of the foot from back. It is a figure for confirming the effect of the present invention. It is a figure for confirming the effect of the present invention. It is a figure for confirming the effect of the present invention. It is a figure for confirming the validity of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of an evaluation system and an evaluation method (hereinafter simply referred to as “evaluation system” and “evaluation method”) for foot dynamic characteristics according to the present invention.

  As shown in FIG. 1, the evaluation system 1 acquires an image pickup device (image pickup means) 2 for picking up a predetermined image of the foot, image data picked up by the image pickup device 2, and predetermined image processing or the like. An arithmetic device (arithmetic unit) 3 that performs the above calculation, an input device 4 that can input predetermined data to the arithmetic device 3, and a predetermined data that can be displayed when the arithmetic device 3 performs an operation and an input by the input device 4 Display device 5 and a load measuring device (load measuring means) 6 for measuring a load acting on the foot of the person to be measured.

  For example, a device such as a digital camera or a digital video camera is employed as the imaging device 2. Image data captured by the imaging device 2 is transmitted to the arithmetic device 3 or read. As shown in FIG. 2, the imaging device 2 has an image of a side surface on the inner side of the foot from the side (an image captured from the position of Y in FIG. 2) and an image of the heel of the foot from the rear (FIG. 2). The image is taken from the position of the symbol X in FIG. This image data is stored in a storage medium such as a memory of the imaging apparatus 2.

  As the arithmetic unit 3, for example, a device such as a personal computer is employed. The computing device 3 includes a computing unit 11 that performs a predetermined computation, a storage unit 12 that stores predetermined data, and a reading unit 13 that can read data from an external storage medium.

  The calculation unit 11 (CPU) can calculate and evaluate the dynamic characteristics of the foot using data and programs stored in the storage unit 12.

  The storage unit 12 is for storing a predetermined program and data. The storage unit 12 includes a RAM, a hard disk, and other parts having various storage functions.

  For example, the reading unit 13 is connected to the imaging device 2 by wire or wireless, and can read image data stored in the imaging device 2. The reading unit 13 can also read the data by taking in the memory of the imaging device 2.

  As the input device 4, for example, devices such as a keyboard and a mouse are employed. The input device 4 is electrically connected to the arithmetic device 3, and can perform a predetermined input operation during image processing by the arithmetic device 3.

  As the display device 5, for example, a liquid crystal display and other various displays are employed. The display device 5 is electrically connected to the arithmetic device 3 and performs display by image data and various programs via the arithmetic device 3.

  As the load measuring device 6, for example, a digital or analog display type weight scale is adopted. This load measuring device 6 can measure the load acting on the foot in the sitting position and standing position of the measurement subject.

  The evaluation system 1 configured as described above performs a predetermined process (image processing) on the image data of the measurement subject's foot acquired by the imaging device 2, thereby obtaining the dynamic characteristics of the measurement subject's foot. It is possible to calculate and evaluate its characteristics.

  Hereinafter, a method for evaluating the dynamic characteristics of the foot by the evaluation system 1 will be described.

  First, when photographing the measurement subject's foot with the imaging device 2, marks are added to two arbitrary points on the buttocks (for example, one point on the inside of the foot and one point on the outside of the foot) before photographing. To do. Specifically, the imaging device 2 captures a foot state in a sitting position where the measurement subject is sitting on a chair and a foot state in a standing position where the measurement subject stands up from the sitting position.

  More specifically, the imaging device 2 captures an image of the state of the inner side of the foot in the sitting position and the state of the buttocks from the rear. Thereafter, the state of the side part inside the foot in the standing state when the person to be measured stands up from the sitting state and the state of the buttocks from the back are photographed.

  During the photographing, the load Wb acting on the foot in the sitting position and the load Wc acting on the foot in the standing position are measured by the load measuring device 6 and the data is recorded.

  After such shooting, the image data recorded in the imaging device 2 is read by the reading unit 13 of the arithmetic device 3. The read image data is stored in the storage unit 12.

  The computing unit 11 of the computing device 3 reads the image data together with a predetermined program from the storage unit 12 and causes the display device 5 to display the image data.

  3 and 4 show examples of image data displayed on the display device 5. As shown in FIG. 3, first, the display device 5 has an image of the inner side of the foot in the sitting position (left side) and an image of the side of the foot in the standing position (right side). Displayed side by side.

  In this state, predetermined image processing is performed by the operator. This image processing is displayed on the display device 5 by the input device 4. At this time, the operator measures the scaphoid vertical height hb of the foot in the sitting position of the measurement subject via the input device 4. Further, the operator measures the scaphoid vertical height hc in the standing position via the input device 4. These measurements are desirably performed visually while being displayed on the display device 5.

  As shown in FIG. 3, when measuring the scaphoid vertical heights hb and hc of the foot, a mark is previously attached to the position of the scaphoid most protruding portion (or scaphoid rough surface portion) of the subject's foot. In addition, in each image displayed on the display device 5, a horizontal line passing through this mark is drawn via the input device 4. Furthermore, the scaphoid vertical heights hb and hc are obtained by drawing a horizontal line passing through the contact position between the sole of the foot and the floor and measuring the distance between the horizontal lines.

  Thus, when comparing the scaphoid vertical height hb of the foot in the sitting position and the scaphoid vertical height of the foot in the standing position, in the sitting position, the weight of the person to be measured does not act on the foot. The scaphoid vertical height hb in the sitting position is larger than the scaphoid vertical height hc in the standing position.

  In the calculation device 3, a difference A between the scaphoid vertical height hb in the sitting position and the scaphoid vertical height hc in the standing position (hereinafter referred to as “a scaphoid vertical change amount”) is obtained by calculation. Further, a difference B (hereinafter referred to as “load change amount”) B between the load Wb in the sitting position and the load Wc in the standing position is obtained by calculation.

  Then, the ratio B / A of the load change amount B to the scaphoid vertical change amount A, that is, (Wb−Wc) / (hb−hc) is obtained by calculation by the calculation device 3. Hereinafter, this ratio is referred to as “arch stiffness”. The arithmetic device 3 can evaluate the “landing impact degree” of the foot of the person to be measured by obtaining the arch rigidity.

  Further, the ratio (hb−hc) / hb of the scaphoid vertical change amount to the scaphoid vertical height hb in the sitting position is obtained by calculation of the calculation device 3. The computing device 3 can evaluate the “inner leg rotation angle” of the measurement subject's foot by obtaining this ratio.

  Further, as shown in FIG. 4, the display device 5 displays the image data of the buttocks of the foot photographed from behind via the arithmetic device 3. More specifically, the image of the buttocks in the sitting position (left side) and the image in the standing position (right side) are displayed side by side.

  In this state, the operator draws a perpendicular line near the center in the width direction of the buttock via the input device 4 and draws a straight line connecting the two marks previously attached to the buttock. In each of the sitting position and the standing position, an angle formed by the straight line and the perpendicular can be calculated, and an angle difference α between the sitting position and the standing position (hereinafter referred to as a “buttock angle change amount”) α can be calculated. The computing device 3 can evaluate the “buttock valgus angle” of the measurement subject by obtaining the heel angle change amount α. As for the heel angle change amount α, a positive value is taken when the heel of the foot is inclined to the valgus as shown in FIG. 4, and the heel of the foot is in the varus of the foot. When tilted, negative values are taken (see FIG. 6 to be described later for positive and negative values).

  The arithmetic device 3 comprehensively analyzes the dynamic characteristics of the subject's foot by determining the arch stiffness, the hip angle change amount, and the ratio of the scaphoid vertical change amount to the scaphoid vertical height hb in the sitting position. Can be evaluated. Based on the evaluation, the arithmetic device 3 can display, for example, optimal shoe candidates on the display device 5.

  As described above, in the present invention, a large instrument / device is not required, and the arch rigidity, which is an index for evaluating the dynamic characteristics of the foot, can be obtained by a simple process. Therefore, it is possible to easily and easily evaluate the dynamic characteristics of the foot by the evaluation system 1 and the evaluation method according to the present invention.

  5 to 7 show the results of tests performed to confirm the effects of the present invention. In this test, the evaluation method by the evaluation system 1 according to the present invention is performed on a plurality of subjects, the relationship between the arch rigidity and the landing impact degree (FIG. 5), the heel inclination angle and the maximum valgus angle during travel And the relationship between the ratio of the scaphoid vertical change amount to the scaphoid vertical height hb in the sitting position and the crus internal rotation angle (see FIG. 7).

  FIG. 5A is a graph showing the relationship between the arch rigidity and the landing impact degree of the present invention. In FIG. 5A, the horizontal axis represents the arch rigidity, and the vertical axis represents the landing impact force. In addition, each point of the rhombus shown in the figure has shown the test result of each test subject (a total of 8 persons) (hereinafter the same in FIGS. 6 and 7). As shown in FIG. 5A, from the test results, a correlation (proportional relationship) could be found between the arch rigidity and the landing impact force.

  FIG. 5B shows the relationship between the arch height rate and the landing impact force, which is an index that has been conventionally used (see Japanese Patent Application Laid-Open No. 2004-305374 for the arch height rate). In FIG. 5B, the horizontal axis represents the arch height factor and the vertical axis represents the landing impact force. As shown in FIG. 5B, it can be seen that the arch height ratio and the landing impact force are in a proportional relationship.

  Comparing FIG. 5 (a) and FIG. 5 (b), both show almost the same tendency. From this, it is considered that the arch rigidity according to the present invention is suitable for evaluating the landing impact degree.

  In addition, when the correlation coefficient R1 was calculated | required from the relationship between the arch rigidity and landing impact force shown to Fig.5 (a), it was R1 = 0.82. On the other hand, when the correlation coefficient R2 was obtained from the relationship between the arch height rate and the landing impact force shown in FIG. 5B, R2 = 0.65. As described above, the relationship between the arch rigidity and the landing impact force according to the present invention shows a stronger correlation than before, and it is considered that the arch rigidity is suitable for evaluating the landing impact level.

  FIG. 6A is a graph showing the relationship between the amount of change in the buttock angle and the maximum valgus angle during travel according to the present invention. In FIG. 6A, the horizontal axis represents the heel angle change amount, and the vertical axis represents the maximum valgus angle during travel (the heel valgus angle). As shown to Fig.6 (a), the correlation (proportional relationship) was able to be found between the buttocks angle change amount and the maximum valgus angle at the time of driving | running | working by the test result.

  FIG. 6B shows the relationship between the inclination angle of the kite, which is an index conventionally used, and the maximum valgus angle during travel. In the conventional measurement of the inclination angle of the heel, for example, a relatively large three-dimensional foot type measuring device is used. Here, “INFOT” (registered trademark) manufactured by Eyewear Laboratory Co., Ltd. was used as the three-dimensional foot measuring instrument. In FIG. 6 (b), the horizontal axis represents the inclination angle of the heel, and the vertical axis represents the maximum valgus angle during travel (the heel portion valgus angle). As shown in FIG. 6 (b), it can be seen that there is a proportional relationship between the inclination angle of the conventional kite and the maximum valgus angle during travel.

  Comparing FIG. 6 (a) and FIG. 6 (b), both show almost the same tendency. From this, it is considered that the heel angle change amount according to the present invention is suitable for evaluating the heel valgus angle.

  In addition, when the correlation coefficient R3 was calculated | required from the relationship between the collar part angle variation | change_quantity and the collar part valgus angle degree shown to Fig.6 (a), it was R3 = 0.82. On the other hand, when the correlation coefficient R4 was determined from the relationship between the inclination angle of the heel and the heel valgus angle shown in FIG. 6B, R4 = 0.58. As described above, the relationship between the heel angle change amount and the heel valgus angle angle according to the present invention shows a stronger correlation than the conventional one, and from this, the heel angle change amount is also the buttock valgus angle angle. It is thought that it is suitable for evaluating.

  FIG. 7 shows the relationship between the ratio of the vertical change amount of the scaphoid bone to the vertical height of the scaphoid bone in the sitting position (vertical amount of depression) and the maximum internal rotation angle (crut internal rotation angle) during running. It is a graph. In FIG. 7, the horizontal axis represents the ratio, and the vertical axis represents the maximum internal rotation angle during travel (crusal internal rotation angle). As shown in FIG. 7, from the test results, a correlation (proportional relationship) could be found between the ratio and the crus internal rotation angle.

  The correlation coefficient R5 was determined from the relationship between the ratio shown in FIG. 7 and the crus internal rotation angle, and R5 = 0.85. Thus, there is a very strong correlation between the ratio and the crus internal rotation angle. From this point, it is considered that the ratio is suitable for evaluating the crus internal rotation angle.

  FIG. 8 shows the result of further examination on the validity of the evaluation method according to the present invention. In this examination, a multiple regression analysis was performed using Excel Statistics 2000 (manufactured by Social Information Service Co., Ltd.), and the correlation between the conventional method and the evaluation method of the present invention was determined based on the P value. As a result of this examination, it has been found that the present invention has a stronger correlation with respect to the evaluation index (arch stiffness, etc.) of the evaluation method according to the present invention than the conventional method.

  DESCRIPTION OF SYMBOLS 1 ... Evaluation system of the dynamic characteristic of a foot, 2 ... Imaging apparatus (imaging means), 3 ... Arithmetic apparatus (calculation means), 4 ... Input apparatus (input means), 5 ... Display apparatus (display means), 6 ... Load Measuring device (load measuring means), 11 ... calculation unit, 12 ... storage unit, 13 ... reading unit

Claims (6)

A load measuring means capable of measuring the foot load in the sitting position of the measured person and the foot load in the standing position of the measured person;
An imaging means for acquiring an image of the inner side of the foot in the sitting position of the measured person and an image of the inner side of the foot in the standing position of the measured person;
From the image of the inner side of the foot in the sitting position and standing position obtained by the image pickup means, the amount A of the scaphoid vertical change A of the measured person's foot, and the load change between the sitting load and the standing position load on the measured person Computing means for computing the quantity B,
Further, the computing means computes a dynamic characteristic of the foot characterized by computing the value of B / A as the arch stiffness and evaluating the degree of landing impact of the subject's foot based on the value of the arch stiffness. System to evaluate. An imaging means for acquiring an image of the buttocks of the foot from behind in the sitting position of the measured person and an image of the buttocks of the foot from behind in the standing position of the measured person;
A calculation means for calculating the amount of change in the buttocks angle of the foot of the person to be measured from the image of the buttocks of the foot from the rear in the sitting position and the standing position obtained by the imaging means;
Further, the calculating means calculates the correlation between the amount of change in the heel angle of each foot of the plurality of subjects acquired in advance and the degree of valgus valgus angle of each foot of the plurality of subjects acquired in advance. a heel angle variation of the measurement's foot, on the basis of a system for evaluating the dynamic characteristics of the foot, characterized in that to evaluate the heel outer dihedral degree foot of the subject. An imaging means for acquiring an image of the inner side of the foot in the sitting position of the measured person and an image of the inner side of the foot in the standing position of the measured person;
A calculation means for calculating a scaphoid vertical change amount of the foot of the person to be measured from an image of a side part of the foot in a sitting position and a standing position obtained by the imaging means;
Further, the calculation means calculates the ratio of the scaphoid vertical change amount of the subject's foot to the vertical height of the scaphoid bone in the sitting position, and the scaphoid of the foot in each sitting position of a plurality of subjects acquired in advance. Correlation between the ratio of the amount of vertical change in the scaphoid bone to the vertical bone height and the internal inclination angle of the lower leg of each of the plurality of subjects obtained in advance, and the calculated scaphoid bone of the measured subject's foot A system for evaluating the dynamic characteristics of the foot, characterized by evaluating the degree of internal rotation of the leg of the subject's foot based on the ratio of the vertical change amount . Measure the load on the foot in the sitting position of the person being measured and the load on the foot in the standing position of the person being measured by the load measuring means,
An image of the inner side of the foot in the sitting position of the measured person and an image of the inner side of the foot in the standing position of the measured person are acquired by the imaging means,
From the image of the inner side of the foot in the sitting position and standing position obtained by the image pickup means, the amount A of the scaphoid vertical change A of the measured person's foot, and the load change between the sitting load and the standing position load on the measured person The amount B is calculated by the calculation means,
Further, a dynamic characteristic of the foot characterized in that the computing means calculates the B / A value as the arch stiffness and evaluates the degree of landing impact of the subject's foot based on the arch stiffness value. How to evaluate. An image of the buttocks of the foot from the back in the sitting position of the measured person and an image of the buttocks of the foot from the back in the standing position of the measured person are acquired by the imaging unit,
From the image of the buttocks of the foot from the back in the sitting position and standing position obtained by the imaging means, the amount of change in the buttocks angle of the toe of the person being measured is calculated by the calculating means,
Further, the calculating means obtains a correlation between a previously obtained heel angle change amount of each of a plurality of subjects and a previously acquired heel valgus angle of each of the plurality of subjects, and the calculated subject. a heel angle variation of the measurement's foot, on the basis of a method of evaluating the dynamic characteristics of the foot, characterized in that to evaluate the heel outer dihedral degree foot of the subject. An image of the inner side of the foot in the sitting position of the measured person and an image of the inner side of the foot in the standing position of the measured person are acquired by the imaging means,
From the image of the inner side of the foot in the sitting position and standing position obtained by the imaging means, the scaphoid vertical change amount of the measurement subject's foot is calculated by the calculating means,
The calculation means calculates the ratio of the scaphoid vertical change amount of the subject's foot to the vertical height of the scaphoid bone in the sitting position, and the foot scaphoid vertical in each sitting position of a plurality of subjects obtained in advance. Correlation between the ratio of the amount of vertical change in the scaphoid bone to the height and the internal inclination angle of each leg of the plurality of subjects obtained in advance, and the calculated scaphoid vertical change in the foot of the subject to be calculated A method for evaluating a dynamic characteristic of a foot, characterized by evaluating a degree of internal rotation of a leg of a subject's foot based on a ratio of amounts .

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