JP5144758B2 - Supporter to suppress foot varus - Google Patents

Description

  The present invention relates to a supporter for suppressing foot varus.

  In recent years when sports medicine has been developed, supporters are sometimes used to compensate for the weakened functions of the body when playing sports. Supporters are often attached to joints with high momentum, such as ankles, elbows, and knees, and are recognized as auxiliary devices for protecting yourself from sprains and fractures. Further, even when an injury such as sprain is caused, a supporter is used for the purpose of assisting the movement of the damaged part during the treatment.

The following prior art documents 1 and 2 are listed as documents disclosing a supporter for preventing an ankle sprain.
JP 2003-290259 A (FIGS. 1 and 2) WO2006 / 041992 (Summary)

  These prior art documents 1 and 2 disclose a supporter whose lower part rotates around a hinge with respect to a fixed part fixed to a leg part via a trender (a SOCK that does not cover a toe or a heel).

  Japanese Patent Application Laid-Open No. 2004-166811 discloses an assisting tool for a patient who cannot freely move an ankle joint by his / her own intention.

FIG. 14D is a view of the left foot F and the left leg L viewed from the rear.
In this figure, a varusal sprain in which the sole is twisted toward the inner side IN is more likely to occur than a valgus sprain in which the sole is twisted toward the outer side OUT.

FIG. 14A, FIG. 14B, and FIG. 14C are side views of the foot in the basic limb position (anatomical limb position), dorsiflexion position, and plantar flexion position, as viewed from the inside.
In the bottom bent position of FIG. 14C, varus sprain is more likely to occur than the basic limb position of FIG. 14A and the dorsiflexed position of FIG. 14B. The following reasons can be considered as the reason.
(1) The distance from the force point Of to the fulcrum O is longer in the case of the bottom bending position than in the case of the basic limb position or the dorsiflexion position.
(2) Compared to the dorsiflexion position, the ankle joint itself has lower rigidity in the bottom bending position.
(3) In the plantar bending position, it is difficult to exert muscular strength against the club.

  On the other hand, many supporters that prevent varus sprain suppress lateral bending of the foot joint. For this reason, wearing of the supporter hinders the free movement of the ankle in the lateral direction, thus leading to performance degradation. For these reasons, it is preferable that the varus suppressive action is small in the basic limb position and the dorsiflexion position other than the plantar bending position.

  However, each of the above-mentioned prior art documents does not disclose any supporter in which the drag force that suppresses varus sprain is changed according to the limb position of the foot.

  An object of the present invention is to provide a supporter that exhibits a high varus suppressive action in the plantar flexion position and that can be expected to move freely in the lateral direction of the ankle joint in the dorsiflexion position and the basic limb position. .

  In order to achieve the above object, a supporter for suppressing the varus of the foot according to the present invention covers a part of the heel and a part of the inner side surface of the leg above the heel, and is fixed to the leg. A plate and a lower plate that covers a part of the heel and a part of the inner surface of the foot part below the heel, is fixed to the foot part, and is applied to the inner surface of the foot so as to suppress the varus of the foot And a hinge for connecting the two plates to each other on the inner side surface of the heel and allowing the two plates to rotate relative to each other when the foot is bent or dorsiflexed. The lower plate is disposed between the upper plate and the foot, and a reinforcing portion that protrudes below the hinge and overlaps at least part of the lower plate when the foot is bent is formed on the upper plate. The reinforcement part of the plate and a part of the lower plate Consists beamed overlaid by the bottom flexion overlap, by the thus overlapping beams are configured, the resistance to varus of the bottom flexion is greater than the resistance to varus of the foot of the back flexion.

According to the present invention, the lower plate rotates in accordance with the sole dorsiflexion of the foot, and the overlapped beam portion is formed by overlapping the upper and lower plates at the time of the bottom flexion, and the resistance by both plates against the varus at the time of the bottom flexion is large. Become. Therefore, it is possible to prevent the sprain by suppressing the varus in the slight bottom bending position in which a varus sprain is likely to occur.
On the other hand, when the dorsiflexion is less likely to cause sprains, the resistance of both plates to the varus is reduced, so that it is difficult to prevent free foot movement during dorsiflexion.

  Here, “mild plantar flexion” means that, as shown in FIG. 14C, the tilt angle θ between the horizontal line passing through the heel and the line along the sole in the plantar flexion is about 10 ° to 30 °. Say.

  In a preferred embodiment of the present invention, each of the upper plate and the lower plate constitutes a part of the hinge, and the reinforcing portion is a projecting piece projecting obliquely rearward downward from the hinge, The area of the overlapped beam portion where the lower plate and the protruding piece overlap each other during the bottom bending is larger than the area of the overlapped beam portion where the lower plate and the protruding piece overlap each other during the back bending.

According to this embodiment, the projecting piece which is the reinforcing portion protrudes obliquely backward and downward from the hinge, the lower plate rotates in accordance with the sole dorsiflexion motion of the foot, and the lower plate is in the slight bottom flexion position. A large overlap with the projecting piece increases resistance to the varus caused by the upper and lower plates. On the other hand, in the dorsiflexion position, the resistance to the varus caused by the upper and lower plates is reduced.
Further, the drag change can be obtained with a simple configuration in which only a protruding piece is provided.

In a preferred embodiment of the present invention, the extending direction of the protruding piece is inclined by 10 ° to 40 ° with respect to a vertical line passing through the center of the hinge in a basic limb position where the foot is not bent.
By setting in this way, the resistance to the varus caused by both plates in the slight bottom bending position is increased.

  In a preferred embodiment of the present invention, the resistance to the varus in the slight dorsiflexion position is greater than the resistance to the valgus in the basic limb position where the foot is not bent, and the varus in the dorsiflexion position where the foot is dorsiflexed. Greater than the resistance against

  In a preferred embodiment of the present invention, the upper plate constitutes a part of the hinge, and a first fixed portion that is disposed above the collar along the inner side surface of the leg portion and is fixed to the leg portion. A first sliding portion and the reinforcing portion, wherein the lower plate constitutes a part of the hinge and rotates relative to the first sliding portion and directly or directly on the first sliding portion A second sliding portion that slides indirectly; and a second fixed portion that is fixed to a foot portion disposed below the heel, wherein the second fixed portion of the lower plate is the talus and radius The reinforcing portion extends at least from the heel to the subtalar joint between the talus and calcaneus in a basic limb position where the foot is not bent.

  According to this embodiment, the reinforcing part extending to the subtalar joint at the time of plantar flexion overlaps with the lower plate to constitute the overlap beam, thereby increasing the resistance against the varus caused by both plates and suppressing the varus sprain.

In the present invention, a trender made of a fiber material that covers at least a part of the leg part, the heel, the instep and the arch of the foot and fits the skin surface, and each fixed part of the upper plate and the lower plate on the trenker And a fixing means for fixing.
Since the to-be-fixed part of each plate is fixed to the trender, stable fixing can be expected.

  In a preferred embodiment of the present invention, the hinge is formed integrally with the lower plate above the lower plate and an annular first annular portion formed integrally with the upper plate at the lower portion of the upper plate. An annular second annular portion that is rotatably fitted to the first annular portion, and the two annular portions are arranged in a direction along a substantially horizontal axis passing through the rotation center of the hinge. And a separation preventing piece for preventing the separation, wherein the separation prevention piece includes a flange portion that engages with an outer surface of the first annular portion, and a fixing portion that is fixed to the second annular portion. And have.

  According to this embodiment, the separation preventing piece is welded to the second annular portion, so that the upper and lower plates can be reliably prevented from separating in the two annular portions, and the number of parts can be reduced.

FIG. 1 is an inner side view showing a supporter according to an embodiment of the present invention attached to a right foot. FIG. 2 is an outer side view of the supporter. FIG. 3 is a perspective view showing the developed belt with a plate for the right foot. FIG. 4 is a perspective view showing a state before the belt with a plate is attached to the trunk card attached to the right foot. FIG. 5 is a perspective view showing a state in which the plate-attached belt is attached to the trender attached to the right foot. FIG. 6 is a perspective view of the inner and outer plate assemblies for the right foot as viewed from the obliquely forward inner side. FIG. 7 is an exploded perspective view of the inner plate assembly for the right foot as seen from the inside obliquely forward. FIG. 8 is an exploded perspective view of the inner plate assembly for the right foot as viewed obliquely from the rear outside. FIG. 9 is an exploded longitudinal sectional view of the inner plate assembly for the right foot. 10A is a side view of the inner plate assembly for the right foot as seen from the inside, FIG. 10B is a longitudinal sectional view of the plate assembly, and FIG. 10C is a side view of the plate assembly as seen from the outside. FIG. 11A, FIG. 11B, and FIG. 11C are inner side views showing the relationship between the upper plate and the lower plate of the inner plate assembly for the right foot in the dorsiflexion position, the basic limb position, and the bottom bending position, respectively. 12A is an inner side view showing the relationship between the inner plate assembly for the right foot and the foot skeleton, and FIG. 12B is an inner side view showing the relationship between the upper plate of the plate assembly and the foot skeleton. 13A is a side view of the relationship between the foot and the plate assembly in the basic limb position as viewed from the inside, FIG. 13B is a side view of the relationship between the foot and the plate assembly in the dorsiflexion position as viewed from the inside, and FIG. It is the side view which looked at the relationship between the leg | foot and plate assembly in from the inside. 14A, FIG. 14B, and FIG. 14C are side views of the legs in the basic limb position, the dorsiflexion position, and the dorsiflexion position, respectively, viewed from the inside, and FIG. 14D is a rear view of the left foot section and the left leg section viewed from the rear. It is. FIG. 15 is an inner side view showing a modification of the upper plate of the inner plate assembly for the right foot.

Explanation of symbols

1: Trench 2: Belt with plate 21: Connection belt portion 22: Winding belt portion 30: Inner plate assembly 31: Outer plate assembly 32: Inner upper plate 32a: First fixed portion 32b: Reinforcing portion 32c: First annular part 32s: first sliding surface (first sliding part)
33: Outer upper plate 34: Lower plate 34a: Second fixed portion 34c: Second annular portion 34s: Second sliding surface (second sliding portion)
35: Collar (detachment prevention piece)
35a: collar part 35b: cylindrical part (adhering part)
4: Hinge 5: Laminated beam part Ak: Acupuncture B1: Talar B2: Fibula F: Foot J: Subtalar joint L: Leg S1: Basic limb position (anatomical limb position)
S2: Dorsiflexion S3: Sole flexion Fi: Instep Fa: Arch of foot V: Vertical line

  The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and drawings are for illustration and description only, and the scope of the present invention is defined by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following description, a right foot supporter will be described as an example.

  As shown in FIGS. 1 to 5, the supporter includes a trunker 1 and a belt 2 with a plate, and is attached to the ankle to exhibit a function of suppressing varus.

The trunk 1 covers the lower part of the leg L, the heel Ak, a part of the instep Fi, and a part of the foot arch Fa, tightens these parts, and fits these parts. The said Torenka 1 consists of a stretchable fiber material which fits a skin surface.
In this embodiment, the rear end of the heel and the toe of the foot are not covered with the trender 1 and are exposed.

  A large number of fibers serving as female surface fasteners (an example of fixing means) 1 f are planted on the inner and outer side surfaces, the rear surface, and the bottom surface of the trainer 1. The male fastener 1m provided on the leg-side surface of the trunker 1 is engaged with the female fastener 1f on the back surface, and the state where the trunker 1 is attached to the ankle is maintained.

  The plate-equipped belt 2 includes inner and outer plate assemblies 30 and 31 in FIG. 3, a connecting belt portion 21 that connects the assemblies 30 and 31 to each other, and a winding belt portion 22 attached to the inner assembly 30. Is provided. As shown in FIG. 6, each of the assemblies 30 and 31 includes upper plates 32 and 33, a lower plate 34 and a collar (detachment prevention piece) 35 made of hard synthetic resin.

  3 are provided with male surface fasteners (an example of fixing means) 2m and 3m on the surfaces of the connecting belt portion 21 and the assemblies 30 and 31 that are in contact with the trainer 1, and the male surface fasteners 2m and 3m are provided. By engaging with the female surface fastener 1 f, both the assemblies 30 and 31 are fixed to the inner and outer side surfaces of the trunker 1 as shown in FIG. 5.

  A female surface fastener (an example of fixing means) 2f is provided on the outer peripheral surface of the winding belt portion 22, while a male surface fastener (an example of fixing means) 2m is provided on the inner peripheral surface of the winding belt portion 22. It has been. A female surface fastener (an example of a fixing means) 3f is bonded to the outer surface of the upper part of the upper plates 32, 33 constituting a part of the assemblies 30, 31.

  As shown in FIG. 5, the winding belt portion 22 is wound around the leg L around the outer surface of the trunker 1 and the assemblies 30 and 31, and the male fastener 2 m of the winding belt portion 22 is replaced with the female fastener 2 f and It engages with the female fastener 3f of the upper plates 32, 33. As a result, both assemblies 30 and 31 fixed to the trunker 1 are fixed to the leg portion L and the foot portion F.

  1 to 5, the male fasteners are indicated by halftone dots, and the female fasteners are indicated by a curved pattern.

The said winding belt part 22 of FIG. 1 consists of a non-stretchable fiber raw material, for example. On the other hand, since the connecting belt portion 21 is made of a stretchable fiber material and can be stretched in the width direction of the foot, it is possible to adjust the mounting position of the assemblies 30 and 31 with respect to the heel Ak.
Both ends of the connecting belt portion 21 are fixed to the lower ends of the lower plates 34 and 34 (FIGS. 1 and 2) of both the assemblies 30 and 31, and cover the two lower surfaces of the lower plates 34 and 34. Yes.

  The upper plates 32 and 33 (FIGS. 1 and 2) cover a part of the heel Ak and a part of the inner side surface of the leg L above the heel Ak, and are fixed to the leg L. On the other hand, the lower plates 34, 34 cover a part of the heel Ak and a part of the inner surface of the foot F below the heel Ak, and are fixed to the foot F, as will be described later. It abuts on the inner surface of the foot so that it can be suppressed.

  Each assembly 30, 31 of FIG. 6 has a structure in which the lower plate 34 can rotate about a substantially horizontal axis Ls extending in the foot width direction at the hinge 4 with respect to the upper plates 32, 33. Hereinafter, an example of this structure will be described with the inner plate assembly 30 as a representative.

  As shown in FIGS. 7 to 9, the assembly 30 includes three parts: an upper plate 32, a lower plate 34, and a collar (detachment prevention piece) 35. The annular first and second annular portions 32c, 34c and the collar 35 of the plates 32, 34 constitute the hinge 4 of FIG. 10B as will be described later.

  As shown in FIG. 10B, the first annular portion 32 c is formed integrally with the upper plate 32 below the upper plate 32. On the other hand, the second annular portion 34c is formed integrally with the lower plate 34 at the upper portion of the lower plate 34, is fitted into the inner periphery of the first annular portion 32c, and rotates with respect to the first annular portion 32c. Fit as possible.

  The first and second annular portions 32c and 34c include conical first and second sliding surfaces (first and second sliding portions) 32s and 34s that constitute a part of the hinge 4, respectively. Both the sliding surfaces 32s and 34s are rotatable relative to each other, and in the case of this embodiment, are in direct sliding contact with each other.

  The collar 35 includes a flange portion 35a that engages with the outer surface of the first annular portion 32c, and a cylindrical portion (fixed portion) 35b that fits into the second annular portion 34c. The outer peripheral surface of the cylindrical portion 35b is fixed to the second annular portion 34c by being welded to the inner peripheral surface of the second annular portion 34c.

  The collar 35 engages with the outer surface of the first annular portion 32c, and the cylindrical portion 35b is fixed to the second annular portion 34c, so that the collar 35 rotates the hinge 4. The two annular portions 32c and 34c are prevented from separating from each other in a direction along a substantially horizontal axis Ls (FIG. 6) passing through the center 40.

  In this way, the hinge 4 connects the upper and lower plates to each other on the inner side surface of the heel, and the upper and lower plates are relatively moved as shown in FIGS. Allow to rotate.

Due to the fixing, the collar 35 rotates integrally with the lower plate 34.
As shown in FIG. 10C, the upper plate 32 is integrally formed with an engagement piece 32e that engages with the upper end of the lower plate. This prevents the lower plate 34 applied to the inside of the foot F from rotating and moving away in the foot varus direction D (FIG. 10B) when the foot F is varying. Is done.
Similarly to the engagement piece 32e, as shown in FIG. 6, an engagement piece 33e that engages with the upper end portion of the outer lower plate 34 may be formed integrally with the outer upper plate 33.

  In FIG. 1, the upper plate 32 includes a first fixed portion 32 a that extends upward from the hinge 4 and a reinforcing portion (projection piece) 32 b that protrudes diagonally rearward of the hinge 4. The inner upper plate 32 is disposed above the flange Ak along the inner surface of the leg L, and is fixed to the leg L via the trunker 1 by the hook and belt fastener 22.

The projecting piece forming the reinforcing portion 32b is inclined by 10 ° to 40 ° with respect to the vertical line V passing through the center 40 of the hinge 4 in the basic limb position S1 (anatomical limb position) where the foot is not bent. It extends to. That is, the angle α formed by the center line Lc of the projecting piece 32b and the vertical line V is set to about 10 ° to 40 °.
As shown in FIG. 2, the outer upper plate 33 is not provided with the reinforcing portion 32b.

  The lower plate 34 has a second fixed portion 34 a that protrudes directly below the hinge 4. The second fixed portion 34 a is disposed below the heel Ak and is fixed to the connecting belt portion 21, and is fixed to the foot portion F via the trunker 1 by the surface fastener provided on the connecting belt 21. . As shown in FIG. 12A, the second fixed portion 34a extends downward so as to straddle the talus B1 and the radius B2, and further extends downward to an intermediate portion of the radius B2.

  As shown in FIG. 12B, in the basic limb position S1 where the foot is not bent, the reinforcing portion 32b extends from the heel Ak to the subtalar joint J between the talus B1 and the calcaneus B2.

  As shown in FIG. 1, the lower plate 34 is disposed between the upper plate 32 and the trainer 1. The protruding piece 32b protrudes below the hinge 4 and overlaps a part of the lower plate 34 in the basic limb position S1, the dorsiflexion position S2, and the bottom bending position S3 in FIGS. 13A to 13C. The overlapped portion 5 subjected to the above structure constitutes a dynamic beam. The overlapping beam portion 5 exhibits a drag force when the lower plate 34 bends when the foot is varus.

  The area of the overlapping beam portion 5 varies depending on the leg positions S1 to S3. That is, the area of the overlapping beam part 5 in the bottom bending position S3 is larger than the area of the overlapping beam part 5 in the basic limb position S1 and the back bending position S2.

  Accordingly, the resistance against the varus of the plate assembly 30 in the mild plantar bending position S3 of FIG. 13C where the foot is bent at 10 ° to 30 ° is larger than the resistance against the varus of the plate assembly 30 at the basic limb position S1 of FIG. 13A. And the resistance against the varus of the plate assembly 30 in the dorsiflexion position S2.

  In the bottom bending position S3 of FIG. 13C, when the foot portion F tries to invert, the inner side surface of the foot portion F is supported by the lower plate 34 and the reinforcing portion 32b via the trunker 1 (FIG. 1). At this time, since the area of the overlapped beam portion 5 where the lower plate 34 and the reinforcing portion 32b overlap is large, the drag force when the lower plate 34 of FIG. Therefore, it is possible to suppress the varus at the bottom bending position S3 where varus is likely to occur.

That is, when the foot F tries to invert in the plantar bending position S3 of FIG. 13C, the lower plate 34 applied to the inner surface of the foot F through the trunker 1 will rotate inward together with the foot F. And
At that time, the portion immediately below the hinge 4 of the lower plate 34 comes into contact with the reinforcing portion 32 b of the upper plate 32 fixed to the leg portion L. As a result, a portion 5 where a part of the lower plate 34 and the reinforcing portion 32b overlap functions as a stacked beam, the lower plate 34 is supported by the reinforcing portion 32b, and the lower plate 34 fixed to the foot F and the legs Since the upper plate 32 fixed to the part L functions as a support for the varus of the foot, the varus of the foot in the plantar bending position S3 can be suppressed.

  On the other hand, in the basic limb position S1 and the dorsiflexion position S2 of FIGS. 13A and 13B, since the area of the overlapping beam portion 5 is small, the free movement of the foot in these limb positions is difficult to be hindered.

FIG. 15 shows another embodiment.
In this figure, the reinforcing portion 32b is provided with a dense halftone dot. In the case of this example, a thin thin portion 32u is integrally formed before and after the thick reinforcing portion 32b obliquely below the hinge 4. In this example, the overlapped beam portion where the thick reinforcing portion 32u overlaps the lower plate 34 becomes larger at the time of bottom bending.

  In FIG. 15, instead of changing the wall thickness, the portion corresponding to the reinforcing portion 32b is formed of a synthetic resin having a large Young's modulus, while the portion corresponding to the thin portion 32u is formed of a synthetic resin having a small Young's modulus. Good.

  11A to 13C and FIG. 15, the assembly 30 is illustrated with the collar 35 removed.

  The reinforcing plate 32b is not provided on the outer upper plate 33 in FIG. The outer upper plate 33 covers a part of the outer surface, not the inner surface of the leg L or the foot F. Other configurations of the outer upper plate 33 are the same as those of the inner upper plate 32, and the description thereof is omitted.

In the above example, through holes are formed in the ridge portions of the assemblies 30 and 31, but a cap may be provided instead of the collar 35 to cover the ridge.
Further, the structure of the hinge may be the structure of the above-mentioned prior art document.
Further, the outer plate assembly need not name necessarily provided.

  The present invention is applied to a supporter attached to an ankle during sports or during treatment.

Claims (5)

A supporter that suppresses the varus of the foot,
An upper plate that covers a part of the heel and a part of the inner surface of the leg above the heel and is fixed to the leg;
A lower plate that covers a part of the heel and a part of the inner surface of the foot part below the heel, is fixed to the foot part, and is applied to the inner surface of the foot so as to suppress the varus of the foot;
Trenka made of a fiber material that covers at least a part of the leg, heel, instep and arch of the foot and fits the skin surface;
Fixing means for fixing each fixed portion of the upper plate and the lower plate to the trenker
The two plates are connected to each other on the inner side surface of the heel, and the two plates rotate around an axis extending in the width direction of the foot when the foot is bent or bent. With an acceptable hinge,
The lower plate is disposed between the upper plate and the foot,
A second annular portion integrally formed with the lower plate at the upper portion of the lower plate is rotatably fitted in a first annular portion integrally formed with the upper plate at the lower portion of the upper plate, The upper plate and the lower plate each constitute a part of the hinge,
Said first circular projecting from the ring portion toward the diagonally rear of the lower, the lower plate overlapping with the second circular portion immediately below the ring portion of the lower plate varus when the foot in the foot of the bottom flexion even without least The upper plate is formed with a projecting piece that exerts a drag force when bending
The protruding portion of the upper plate and the portion directly below the second annular portion of the lower plate overlap each other at the time of the bottom bending, so that the overlapping portion functions as a stacked beam,
The area of the overlapped beam portion where the lower plate and the protruding piece overlap each other during the bottom bending is larger than the area of the overlapped beam portion where the lower plate and the protruding piece overlap each other during the back bending,
A supporter having a greater resistance to the varus at the time of the dorsiflexion of the foot than the resistance to the varus at the time of the dorsiflexion of the foot by configuring the laminated beam in this way.   The supporter according to claim 1, wherein a direction in which the projecting piece extends is inclined by 10 ° to 40 ° with respect to a vertical line passing through a center of the hinge in a basic limb position where the foot is not bent. In Claim 1, the area of the said overlap beam in the mild plantar bending position where the angle | corner which the angle | corner which the straight line connecting the sole of the heel and the convex part which protruded below in the toe and the horizontal line makes is 10 to 30 degrees, Is larger than the area of the lap beam in the basic limb position where it is not bent, and larger than the area of the lap beam in the dorsiflexion position where the foot is dorsiflexed. A supporter that is larger than a resistance against the club in the basic limb position and larger than a resistance against the club in the dorsiflexion position. 2. The first plate according to claim 1, wherein the upper plate is disposed above the flange along the inner side surface of the leg portion and is fixed to the leg portion, and the first slide constituting a part of the hinge. A moving part and the protruding piece;
The lower plate constitutes a part of the hinge and rotates relative to the first sliding portion and slides directly or indirectly on the first sliding portion; and A second fixed portion fixed to a foot portion disposed below the heel,
The second fixed portion extends downward so as to straddle the talus and ribs,
A supporter in which the protruding piece extends at least from the heel to the subtalar joint between the talus and calcaneus in a basic limb position where the foot is not bent. The hinge according to claim 1,
Before Symbol and the first circular ring portion,
Before Symbol and the second annular parts,
A separation preventing piece for preventing the two annular portions from separating in a direction along a substantially horizontal axis passing through the rotation center of the hinge;
Here, the separation preventing piece is
The supporter which has the collar part engaged with the outer surface of the said 1st annular part, and the adhering part fixed to the said 2nd annular part.

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