Tibia osteotomy positioning device

Abstract

The utility model provides a tibia osteotomy positioning device, and belongs to the technical field of medical instruments. The tibia osteotomy positioning device comprises a force line adjusting rod assembly, an osteotomy guide assembly, a positioning assembly and an ankle holding device, the positioning assembly is arranged at the upper end of the force line adjusting rod assembly, abuts against an intercondylar bulge and is used for positioning the intercondylar bulge, the osteotomy guide assembly is arranged on the force line adjusting rod assembly, and the ankle holding device is arranged on the force line adjusting rod assembly. The osteotomy guiding assembly is arranged below the positioning assembly, and the ankle holding device is arranged at the lower end of the force line adjusting rod assembly and used for being arranged at the ankle joint of a patient. According to the tibia osteotomy positioning device, the positioning assembly is arranged and located at the upper end of the force line adjusting rod assembly, when the tibia osteotomy positioning device is used, the positioning assembly is placed on an intercondylar bulge of a patient, the measurement and calculation accuracy of the osteotomy amount is improved, and the situation that the recovery of the patient is affected due to the fact that the osteotomy amount is too large is avoided.

Description

A tibial osteotomy positioning device Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a tibial osteotomy positioning device. Background Technology

[0002] The knee joint is a vital weight-bearing joint in the lower limbs, and its structure and function are among the most complex of all human joints. Total knee replacement surgery is an effective treatment for knee-related diseases, particularly in elderly patients with conditions such as bone wear and osteoarthritis. By replacing and reconstructing the damaged joint with an artificial knee joint, total knee replacement can alleviate symptoms, eliminate pain, correct knee deformities, restore knee function, improve the patient's knee condition, and enhance their quality of life. It can significantly relieve or eliminate symptoms of osteonecrosis, irreducible comminuted fractures and dislocations, pain and limited mobility in osteoarthritis, and stiffness or difficulty in movement in rheumatoid arthritis. Joint range of motion is improved to some extent, and the appearance of deformed limbs is significantly improved. Currently, due to its short treatment duration and significant pain relief, total knee replacement technology is increasingly accepted by both doctors and patients. Statistics show that the clinical success rate of total knee replacement surgery more than 10 years post-surgery is over 90%. Knee replacement surgery primarily involves osteotomy of the affected femur and tibia to obtain the tibial plateau for implanting the prosthesis. A suitable prosthesis is then installed to reconstruct the knee joint. Before osteotomy, the osteotomy angle and thickness for the tibial plateau's posterior tilt angle must be determined. The osteotomy angle mainly refers to the anteroposterior and varus / valgus angles, while the osteotomy thickness refers to the amount of bone removed. The appropriateness of the osteotomy angle and thickness during surgery directly affects the postoperative outcome and recovery. The osteotomy angle and thickness of the femur and tibia play a crucial role in total knee replacement surgery. Intramedullary and extramedullary osteotomy devices are commonly used in knee replacement surgery to confirm the osteotomy angle and thickness. Extramedullary osteotomy devices achieve the purpose of osteotomy without damaging the normal structure of the tibial medullary cavity, resulting in less trauma and bleeding for the patient. Furthermore, their simple operation makes them widely used in clinical practice. The extramedullary osteotomy device includes an ankle tether, a force line adjusting rod assembly, and an osteotomy guide. The ankle tether is located at the bottom of the force line adjusting rod assembly and is fixed in position to stabilize the patient's ankle joint during use. The proximal end of the tibia has an intercondylar eminence. During osteotomy, the presence of the intercondylar eminence can lead to inaccurate calculations of the osteotomy amount, affecting patient recovery. Summary of the Invention

[0003] The purpose of this invention is to provide a tibial osteotomy positioning device, which aims to solve the problem of inaccurate osteotomy measurement.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a tibial osteotomy positioning device is provided, including a force line adjusting rod assembly, an osteotomy guide assembly, a positioning assembly, and an ankle holder. The positioning assembly is disposed at the upper end of the force line adjusting rod assembly and rests against the intercondylar eminence for positioning the intercondylar eminence. The osteotomy guide assembly is disposed at the force line adjusting rod assembly and is disposed below the positioning assembly. The ankle holder is disposed at the lower end of the force line adjusting rod assembly and is used to be placed at the patient's ankle joint.

[0005] In one possible implementation, the positioning assembly includes a positioning plate and a positioning knob, the positioning plate being disposed perpendicular to the force line adjusting rod assembly, and the positioning knob limiting the positioning plate to the upper end of the force line adjusting rod assembly.

[0006] In one possible implementation, a positioning pin group is provided at the first end of the positioning plate away from the force line adjusting rod assembly, and the positioning pin group is vertically arranged on the lower end face of the positioning plate.

[0007] In one possible implementation, the positioning pin assembly includes a first positioning pin and a second positioning pin, wherein the second positioning pin is disposed on the side of the first positioning pin near the force line adjusting rod assembly.

[0008] In one possible implementation, the length of the first positioning pin is greater than that of the second positioning pin.

[0009] In one possible implementation, a limit block is provided at the upper end of the force line adjusting rod assembly, the upper end of the force line adjusting rod assembly extends through the limit block, the positioning knob is threadedly connected to the upper end of the force line adjusting rod assembly, a limit groove is provided on the positioning plate, the positioning plate is sleeved on the outside of the limit block through the limit groove, and the positioning knob limits the positioning plate on the limit block.

[0010] In one possible implementation, the force line adjusting rod assembly includes an upper adjusting slide rod and a lower adjusting slide sleeve. The lower end of the upper adjusting slide rod passes through the upper end of the lower adjusting slide sleeve and has a degree of freedom to move within the lower adjusting slide sleeve. The lower adjusting slide sleeve is provided with a first wrench assembly for locking the position of the upper adjusting slide rod.

[0011] In one possible implementation, the positioning component is disposed at the upper end of the upper adjusting slide, and the osteotomy guide component is sleeved on the upper adjusting slide.

[0012] In one possible implementation, the lower end face of the osteotomy guide assembly is provided with a second wrench assembly for locking the position of the osteotomy guide assembly.

[0013] In one possible implementation, the ankle gripper includes a clamping member, an adjusting crossbar, and a third wrench assembly. The clamping member is used to clamp the patient's ankle, the adjusting crossbar is disposed on the rear side of the clamping member and is horizontally positioned, and the third wrench assembly limits the adjusting crossbar to the force line adjusting rod assembly.

[0014] The beneficial effects of the tibial osteotomy positioning device provided by this utility model are as follows:

[0015] Compared with existing technologies, this invention incorporates a forceline adjustment rod assembly, an osteotomy guide assembly, a positioning assembly, and an ankle clasp. The positioning assembly is positioned above the forceline adjustment rod assembly and placed on the patient's intercondylar eminence, allowing for a direct view of the eminence's location and improving the accuracy of osteotomy measurement, thus preventing excessive osteotomy and its impact on patient recovery. The osteotomy guide assembly is positioned on the forceline adjustment rod assembly, close to its upper end and below the positioning assembly, and is used for osteotomy operations. The ankle clasp is positioned below the forceline adjustment rod assembly and is used to hold the patient's ankle joint, enhancing the stability of the device during surgical procedures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a three-dimensional structural schematic diagram of the tibial osteotomy positioning device provided in an embodiment of this utility model;

[0018] Figure 2 is a three-dimensional structural schematic diagram of the tibial osteotomy positioning device provided in an embodiment of this utility model.

[0019] Figure 3 is an exploded structural diagram of the tibial osteotomy positioning device provided in an embodiment of this utility model.

[0020] Figure 4 is a second exploded structural diagram of the tibial osteotomy positioning device provided in an embodiment of this utility model.

[0021] In the diagram: 1. Upper adjusting slide bar; 2. First positioning surface; 3. Lower adjusting slide sleeve; 4. Positioning plate; 5. Positioning knob; 6. First positioning pin; 7. Second positioning pin; 8. Limiting slide groove; 9. Limiting block; 10. Osteotomy guide assembly; 11. Second wrench seat; 12. Second locking wrench; 13. Sliding locking groove; 14. First wrench seat; 15. First locking wrench; 16. Wrench limiting rod; 17. Clearance groove; 18. Third wrench seat; 19. Third locking wrench; 20. Adjusting crossbar; 21. Third positioning surface; 22. Clamping component. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Referring to Figures 1 to 4, a specific embodiment of the tibial osteotomy positioning device provided by this utility model will now be described, including a force line adjusting rod assembly, an osteotomy guide assembly 10, a positioning assembly, and an ankle holder. The positioning assembly is disposed at the upper end of the force line adjusting rod assembly and rests against the intercondylar eminence for positioning the intercondylar eminence. The osteotomy guide assembly 10 is disposed below the positioning assembly. The ankle holder is disposed at the lower end of the force line adjusting rod assembly and is used to be placed at the patient's ankle joint.

[0024] This utility model provides a tibial osteotomy positioning device. Compared with the prior art, it includes a force line adjustment rod assembly, an osteotomy guide assembly 10, a positioning assembly, and an ankle holder. The positioning assembly is located at the upper end of the force line adjustment rod assembly and is placed on the patient's intercondylar eminence. This allows for a direct view of the intercondylar eminence's position, improving the accuracy of osteotomy measurement and preventing excessive osteotomy that could affect patient recovery. The osteotomy guide assembly 10 is located on the force line adjustment rod assembly, near its upper end and below the positioning assembly. The osteotomy guide assembly 10 is used for osteotomy operations. The ankle holder is used to hold the patient's ankle joint and is located at the lower end of the force line adjustment rod assembly. The ankle holder helps enhance the stability of the device during surgical procedures.

[0025] Specifically, please refer to Figures 1 to 4. The device includes a force line adjustment rod assembly, an osteotomy guide assembly 10, a positioning assembly, and an ankle holder. The force line adjustment rod assembly is vertically arranged. The positioning assembly, osteotomy guide assembly 10, and ankle holder are arranged sequentially from top to bottom on the force line adjustment rod assembly. The positioning assembly is located at the upper end of the force line adjustment rod assembly, facing the patient. The positioning assembly rests against the intercondylar eminence, providing a direct view of the position of the intercondylar eminence, facilitating the calculation of the osteotomy amount and avoiding excessive osteotomy, which could affect the patient's recovery. The osteotomy guide assembly 10 is located below the positioning assembly and is used for osteotomy operations. The ankle holder is used to hold the patient's ankle joint. The clamping part 22 of the ankle holder is facing the patient. The positioning assembly is located in front of the force line adjustment rod assembly. The ankle holder is clamped on the patient's leg, effectively enhancing the stability of the device.

[0026] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The positioning component includes a positioning plate 4 and a positioning knob 5. The positioning plate 4 is set perpendicular to the force line adjustment rod assembly, and the positioning knob 5 limits the positioning plate 4 to the upper end of the force line adjustment rod assembly.

[0027] Specifically, please refer to Figures 1 to 3. The positioning assembly includes a positioning plate 4 and a positioning knob 5. The positioning plate 4 is horizontally positioned and perpendicular to the force line adjustment rod assembly. The positioning plate 4 is positioned towards the patient and is located in front of the force line adjustment rod assembly. The front end of the positioning plate 4 rests against the intercondylar eminence. The positioning knob 5 is located at the upper end of the force line adjustment rod assembly and is positioned above the positioning plate 4. The positioning knob 5 limits the positioning plate 4 to the force line adjustment rod assembly.

[0028] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The first end of the positioning plate 4 away from the force line adjustment rod assembly is provided with a positioning pin group, which is vertically arranged on the lower end face of the positioning plate 4.

[0029] Specifically, please refer to Figures 1 to 3. The positioning pin group is set at the front end of the positioning plate 4 and at the lower end face of the positioning plate 4. The positioning pin group is set perpendicular to the positioning plate 4 and perpendicular to the force line adjustment rod assembly. The positioning pin group rests against the intercondylar eminence to increase the accuracy of positioning the intercondylar eminence and improve the accuracy of osteotomy calculation.

[0030] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The positioning pin group includes a first positioning pin 6 and a second positioning pin 7. The second positioning pin 7 is disposed on the side of the first positioning pin 6 near the force line adjustment rod assembly.

[0031] Specifically, please refer to Figures 1 to 3. The positioning pin group includes a first positioning pin 6 and a second positioning pin 7. The first positioning pin 6 is located in front of the second positioning pin 7. The first positioning pin 6 and the second positioning pin 7 are arranged along the center line of the positioning plate 4.

[0032] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The length of the first positioning pin 6 is greater than that of the second positioning pin 7.

[0033] Specifically, please refer to Figures 1 to 3. The lowest point of the first positioning pin 6 is located below the lowest point of the second positioning pin 7, which conforms to the physiological curve of the intercondylar eminence.

[0034] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. A limiting block 9 is provided at the upper end of the force line adjusting rod assembly. The upper end of the force line adjusting rod assembly extends through the limiting block 9. The positioning knob 5 is threadedly connected to the upper end of the force line adjusting rod assembly. A limiting groove 8 is provided on the positioning plate 4. The positioning plate 4 is sleeved on the outside of the limiting block 9 through the limiting groove 8. The positioning knob 5 limits the positioning plate 4 on the limiting block 9.

[0035] Specifically, please refer to Figures 1 to 3. The limiting block 9 is located at the upper end of the force line adjusting rod assembly, and the upper end of the force line adjusting rod assembly is located above the limiting block 9. The positioning knob 5 is sleeved on the upper end of the force line adjusting rod assembly and is threadedly connected to the upper end of the force line adjusting rod assembly. The positioning plate 4 is provided with a limiting groove 8, which is located at the rear end of the positioning plate 4 and is set along the centerline of the positioning plate 4. The limiting block 9 is slidably set in the limiting groove 8. The positioning knob 5 is located above the positioning plate 4. When the positioning knob 5 moves downward, it presses the positioning plate 4 tightly against the limiting block 9 to lock the position of the positioning plate 4. When the positioning knob 5 moves upward, it releases the lock on the positioning plate 4, allowing the positioning plate 4 to slide, which facilitates the positioning of the intercondylar eminence.

[0036] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The force line adjustment rod assembly includes an upper adjustment slide rod 1 and a lower adjustment slide sleeve 3. The lower end of the upper adjustment slide rod 1 passes through the upper end of the lower adjustment slide sleeve 3 and has the freedom to move within the lower adjustment slide sleeve 3. A first wrench assembly for locking the position of the upper adjustment slide rod 1 is provided on the lower adjustment slide sleeve 3.

[0037] Specifically, please refer to Figures 1 to 3. The force line adjusting rod assembly includes an upper adjusting slide rod 1 and a lower adjusting slide sleeve 3. The upper adjusting slide rod 1 passes through the lower adjusting slide sleeve 3, and the upper end of the upper adjusting slide rod 1 protrudes from the upper end of the lower adjusting slide sleeve 3. The upper adjusting slide rod 1 has the freedom to move within the lower adjusting slide sleeve 3. A first positioning surface 2 is provided on the side wall of the upper adjusting slide rod 1. The first positioning surface 2 is located on the rear side of the upper adjusting slide rod 1 and is arranged along the length direction of the upper adjusting slide rod 1. A second positioning surface matching the first positioning surface 2 is provided on the inner wall of the lower adjusting slide sleeve 3 to prevent the upper adjusting slide rod 1 from rotating relative to the lower adjusting slide sleeve 3 during use. A first wrench assembly is provided on the lower adjusting slide sleeve 3 for locking the position of the upper adjusting slide rod 1.

[0038] Further, referring to Figures 1 to 3, the upper end of the lower adjusting sleeve 3 is provided with a sliding locking groove 13, which is located behind the first positioning surface 2. The first wrench assembly includes a first wrench seat 14 and a first locking wrench 15. The first locking wrench 15 is arranged horizontally. The first wrench seat 14 is located at the upper end of the lower adjusting sleeve 3. The rear side wall of the first wrench seat 14 is provided with a first wrench groove, which is located behind the sliding locking groove 13. The first locking wrench 15 is L-shaped and includes a vertically arranged first short side block and a first long side block. The first short side block is hinged in the first wrench groove. The first locking wrench 15 has a horizontal position within the horizontal plane. The first wrench seat 14 is equipped with a wrench limiting rod 16, which is located on the side of the first short block away from the first long block. When the end of the first short block away from the first long block abuts against the first positioning surface 2 located in front of the sliding locking groove 13, the wrench limiting rod 16 locks the position of the first short block to prevent the first short block from rotating, thereby locking the position of the upper adjusting slide rod 1. When the first locking wrench 15 is pulled, the end of the first short block away from the first long block disengages from the first positioning surface 2, releasing the lock on the position of the upper adjusting slide rod 1. The position of the upper adjusting slide rod 1 and the positioning plate 4 can be adjusted according to the actual situation.

[0039] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The positioning component is set at the upper end of the upper adjusting slide rod 1, and the osteotomy guide component 10 is sleeved on the upper adjusting slide rod 1.

[0040] Specifically, please refer to Figures 1 to 3. The positioning component and the osteotomy guide component 10 are both mounted on the upper adjusting slide bar 1, and the positioning component is located above the osteotomy guide component 10.

[0041] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1 to 3. The lower end face of the osteotomy guide component 10 is provided with a second wrench component for locking the position of the osteotomy guide component 10.

[0042] Specifically, please refer to Figures 1 to 3. The second wrench assembly is located on the lower end face of the osteotomy guide assembly 10 and is used to lock the osteotomy guide assembly 10 onto the upper adjusting slide rod 1.

[0043] Further, referring to Figures 1 to 3, the second wrench assembly has the same structure as the first wrench assembly. The second wrench assembly includes a second wrench seat 11 and a second locking wrench 12. The second locking wrench 12 is arranged laterally. The second wrench seat 11 is located on the lower end face of the osteotomy guide assembly 10. A second wrench groove is provided on the rear side wall of the second wrench seat 11. The upper adjusting slide rod 1 passes through the second wrench groove, and the first positioning surface 2 passes through the second wrench groove. The second locking wrench 12 is located behind the first positioning surface 2. The second locking wrench 12 is L-shaped. The device includes a vertically arranged second short side block and a second long side block. The second short side block is hinged in the second wrench slot. The second locking wrench 12 has the freedom of rotation in the horizontal plane. When the end of the second short side block away from the second long side block abuts against the first positioning surface 2, the position of the osteotomy guide assembly 10 is locked. When the second locking wrench 12 is turned, the end of the second short side block away from the second long side block disengages from the first positioning surface 2, thus releasing the locking of the position of the osteotomy guide assembly 10. The position of the osteotomy guide assembly 10 can be adjusted according to the actual situation.

[0044] As a specific embodiment of the tibial osteotomy positioning device provided by this utility model, please refer to Figures 1, 2 and 4. The ankle clamp includes a clamping member 22, an adjusting crossbar 20 and a third wrench assembly. The clamping member 22 is used to clamp the patient's ankle. The adjusting crossbar 20 is located on the rear side of the clamping member 22 and is horizontally set. The third wrench assembly limits the adjusting crossbar 20 to the force line adjusting rod assembly.

[0045] Specifically, referring to Figures 1, 2, and 4, the ankle support includes a clamping member 22, an adjusting crossbar 20, and a third wrench assembly. The clamping member 22 is used to clamp the ankle and is located at the front end of the adjusting crossbar 20. The third wrench assembly is located at the lower end of the lower adjusting sleeve 3, which has a clearance groove 17 on its right side. The third wrench assembly has the same structure as the first wrench assembly and includes a third wrench seat 18 and a third locking wrench 19. The third locking wrench 19 is vertically positioned. The third wrench seat 18 is located at the lower end of the lower adjusting sleeve 3, and its right side wall has a third wrench groove. The adjusting crossbar 20 passes through the front and rear side walls of the third wrench seat 18, through the third wrench groove, and the right side of the adjusting crossbar 20... The wall is provided with a third positioning surface 21, which is set along the length of the adjusting crossbar 20 and passes through the third wrench groove. The third locking wrench 19 is located on the right side of the third positioning surface 21. The third locking wrench 19 is L-shaped and includes a vertically set third short side block and a third long side block. The third short side block is hinged in the third wrench groove. The third locking wrench 19 has the freedom of rotation in the vertical plane. When the end of the third short side block away from the third long side block abuts against the third positioning surface 21, the position of the adjusting crossbar 20 is locked. When the third locking wrench 19 is moved, the end of the third short side block away from the third long side block disengages from the third positioning surface 21, and the position of the adjusting crossbar 20 is released. The position of the clamping member 22 can be adjusted according to the actual situation.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tibial osteotomy positioning device, characterized in that, The device includes a force line adjusting rod assembly, an osteotomy guiding assembly, a positioning assembly, and an ankle holder. The positioning assembly is located at the upper end of the force line adjusting rod assembly and rests against the intercondylar eminence for positioning the intercondylar eminence. The osteotomy guiding assembly is located below the positioning assembly. The ankle holder is located at the lower end of the force line adjusting rod assembly and is used to hold the patient's ankle joint.

2. The tibial osteotomy positioning device as described in claim 1, characterized in that, The positioning component includes a positioning plate and a positioning knob. The positioning plate is arranged perpendicular to the force line adjusting rod assembly, and the positioning knob limits the positioning plate to the upper end of the force line adjusting rod assembly.

3. The tibial osteotomy positioning device as described in claim 2, characterized in that, A positioning pin group is provided at the first end of the positioning plate away from the force line adjusting rod assembly, and the positioning pin group is vertically arranged on the lower end face of the positioning plate.

4. The tibial osteotomy positioning device as described in claim 3, characterized in that, The positioning pin assembly includes a first positioning pin and a second positioning pin, wherein the second positioning pin is disposed on the side of the first positioning pin near the force line adjusting rod assembly.

5. The tibial osteotomy positioning device as described in claim 4, characterized in that, The length of the first positioning pin is greater than that of the second positioning pin.

6. The tibial osteotomy positioning device as described in claim 2, characterized in that, The upper end of the force line adjusting rod assembly is provided with a limit block, and the upper end of the force line adjusting rod assembly extends through the limit block. The positioning knob is threadedly connected to the upper end of the force line adjusting rod assembly. The positioning plate is provided with a limit groove, and the positioning plate is sleeved on the outside of the limit block through the limit groove. The positioning knob limits the positioning plate on the limit block.

7. The tibial osteotomy positioning device as described in claim 1, characterized in that, The force line adjusting rod assembly includes an upper adjusting slide rod and a lower adjusting slide sleeve. The lower end of the upper adjusting slide rod passes through the upper end of the lower adjusting slide sleeve and has a degree of freedom to move within the lower adjusting slide sleeve. The lower adjusting slide sleeve is provided with a first wrench assembly for locking the position of the upper adjusting slide rod.

8. The tibial osteotomy positioning device as described in claim 7, characterized in that, The positioning component is disposed at the upper end of the upper adjusting slide rod, and the osteotomy guide component is sleeved on the upper adjusting slide rod.

9. The tibial osteotomy positioning device as described in claim 8, characterized in that, The lower end face of the osteotomy guide assembly is provided with a second wrench assembly for locking the position of the osteotomy guide assembly.

10. The tibial osteotomy positioning device as described in claim 1, characterized in that, The ankle gripper includes a clamping member, an adjusting crossbar, and a third wrench assembly. The clamping member is used to clamp the patient's ankle. The adjusting crossbar is located on the rear side of the clamping member and is horizontally positioned. The third wrench assembly limits the adjusting crossbar to the force line adjusting rod assembly.

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