Tibial extramedullary positioning osteotomies in knee replacement surgery

Abstract

This invention discloses an extramedullary tibial osteotomy device for knee replacement surgery, belonging to the field of medical device technology. The device includes a main connecting rod, with an ankle fixation module below it. The ankle fixation module includes an ankle connecting seat, and an angle adjustment module for adjusting varus / valgus and anteversion / anteroversion angles is located behind the ankle connecting seat. The lower end of the main connecting rod is fixed to the angle adjustment module. Above the main connecting rod are a tibial measurement module and a tibial osteotomy module. An upper navigation module and a lower navigation module are respectively located at the upper and lower ends of the main connecting rod. Both the upper and lower navigation modules contain remote sensing modules for acquiring the tibial varus / valgus and anteversion / anteroversion angles. This invention's extramedullary tibial osteotomy device for knee replacement surgery is simple to operate, has a short operation time, and is inexpensive.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an extramedullary osteotomy device for tibial osteotomy in knee replacement surgery. Background Technology

[0002] Total knee arthroplasty (TKA) is the most common surgical procedure for treating end-stage knee osteoarthritis. While TKA significantly improves patients' quality of life, many technical challenges remain to be addressed, with prosthesis alignment being one of the most critical factors affecting prosthesis survival rates. Meta-analyses have shown that excessive varus alignment after TKA results in lower limb prosthesis long-term survival rates lower than in patients with neutral lower limb alignment. A radiometric analysis with over 10 years of follow-up also indicated that prosthesis alignment outside the normal range, especially excessive varus alignment, leads to a higher rate of tibial component displacement. Achieving good prosthesis alignment is crucial for ensuring the effectiveness of TKA surgery, prosthesis survival rates, reducing postoperative complications, and promoting rapid patient recovery.

[0003] The application of 3D printing technology, computer-aided navigation for femoral osteotomy, robot-assisted techniques, and extramedullary tibial osteotomy templates has garnered significant attention for tibial osteotomy. These techniques can improve the accuracy of prosthesis alignment and puncture, but their precision is still affected by various factors. Some of these techniques, due to their longer surgical time, not only increase wound exposure time but also the risk of infection. High costs, high technical requirements, and long learning curves also limit the widespread adoption of these techniques. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an extramedullary tibial osteotomy device for knee replacement surgery that is simple to operate, has a short operation time, and is inexpensive.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] An extramedullary tibial osteotomy device for knee replacement surgery includes a main connecting rod, wherein:

[0007] An ankle fixing module is provided below the main connecting rod. The ankle fixing module includes an ankle connecting seat. An angle adjustment module capable of adjusting the inversion and supination angles and the forward and backward tilt angles is provided behind the ankle connecting seat. The lower end of the main connecting rod is fixed to the angle adjustment module.

[0008] The main connecting rod is equipped with a tibia measurement module and a tibia osteotomy module. The upper and lower ends of the main connecting rod are respectively equipped with an upper navigation module and a lower navigation module. Both the upper and lower navigation modules are equipped with remote sensing modules for obtaining the tibial varus / valgus angle and anteversion / pronation angle.

[0009] Furthermore, the main connecting rod is a height-adjustable structure;

[0010] And / or, the ankle connector includes a V-shaped plate and straps connecting the two ends of the V-shaped plate, and an ankle contact pad is provided on the inner side of the V-shaped plate.

[0011] Furthermore, the angle adjustment module includes a vertical angle adjustment shaft connected to the rear of the ankle connector and extending rearward. A vertical angle adjustment slider is slidably connected to the vertical angle adjustment shaft. A horizontal angle adjustment shaft perpendicular to the vertical angle adjustment shaft is provided on the vertical angle adjustment slider. A horizontal angle adjustment slider is slidably connected to the horizontal angle adjustment shaft. The lower end of the main connecting rod is fixed to the horizontal angle adjustment slider.

[0012] Furthermore, both the vertical angle adjustment shaft and the horizontal angle adjustment shaft have T-shaped cross-sections;

[0013] And / or, both the vertical angle adjustment shaft and the horizontal angle adjustment shaft are arc-shaped with the middle part bent downwards.

[0014] Furthermore, the upper end of the main connecting rod is provided with a module connecting seat, and the tibia measurement module and the tibia osteotomy module are inserted and connected to the module connecting seat.

[0015] Furthermore, the tibia measurement module includes a tibia measurement rod seat, the upper part of which is provided with a tibia measurement rod, the middle part with a nail hole, and the lower part with a second plug-in post that mates with the plug-in hole on the module connector.

[0016] Furthermore, the upper part of the tibia measuring rod seat is provided with a measuring rod groove, and the tibia measuring rod is slidably connected in the measuring rod groove;

[0017] And / or, the two ends of the tibia measuring rod are provided with pins of different lengths below them;

[0018] And / or, the nail hole is a vertically extending groove.

[0019] Furthermore, the tibial osteotomy module includes an osteotomy block and a horizontal adjustment rod hinged to the rear of the osteotomy block. The lower end of the horizontal adjustment rod is provided with a first insertion post that mates with the insertion hole on the module connector. The hinge hole on the horizontal adjustment rod is a slot extending along the length of the horizontal adjustment rod.

[0020] Furthermore, the module connector has an L-shaped fixing rod on the side near the tibia. The fixing rod includes a first rod portion connected to the module connector with a certain resistance ball joint and a second rod portion connected to the first rod portion for abutting against the surface of the tibia. The second rod portion has a nail hole.

[0021] Furthermore, the remote sensing module is a MEMS remote sensing module, which contains a three-axis gyroscope and a three-axis accelerometer sensor.

[0022] And / or, the tibial extramedullary osteotomy device in the knee replacement surgery also includes a host computer that is communicatively connected to the remote sensing module.

[0023] The present invention has the following beneficial effects:

[0024] The extramedullary tibial osteotomy device for knee replacement surgery of the present invention, through a simple navigation design, incorporates remote sensing modules on the upper and lower navigation modules to accurately locate the center of the femoral head. An angle adjustment module allows for fine adjustment of the varus, valgus, and kyphosis angles of the tibial osteotomy module, achieving digital, precise, and personalized tibial osteotomy, accurate prosthesis alignment, and low cost, which can significantly reduce medical costs to a certain extent. The device is also simple to operate during surgery, has a short learning curve, and improves the safety, reliability, and scalability of the surgery. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the extramedullary tibial osteotomy device for knee replacement surgery according to the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the middle tibia measurement module;

[0027] Figure 3 for Figure 1 Schematic diagram of the middle tibial osteotomy module;

[0028] Figure 4 for Figure 1 The diagram shows the structure of the ankle fixation module and angle adjustment module at the lower part of the extramedullary tibial osteotomy device, where (a) is a three-dimensional view, (b) is a side view, and (c) is a front view.

[0029] Figure 5 for Figure 1 A schematic diagram showing the usage of the extramedullary tibial osteotomy device.

[0030] Figure 6 This is a schematic diagram of the communication structure between the remote sensing module and the host computer in this invention;

[0031] Figure 7This is a schematic diagram illustrating the measurement principle of the remote sensing module in this invention;

[0032] Figure 8 This is a schematic diagram illustrating the installation location and measurement principle of the MEMS component on the tibial side in this invention. Detailed Implementation

[0033] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] The applicant's independently developed MEMS-assisted femoral extramedullary alignment osteotomy system (FEAOS) was granted a national invention patent in 2021, titled "Extramedullary Positioning Osteotomy Device for Distal Femoral Joint Replacement Surgery" (Patent No.: ZL202111069901.2). It can assist surgeons in achieving satisfactory coronal and sagittal positioning osteotomies of the distal femur. However, FEAOS only addresses femoral lateral positioning osteotomies and does not cover tibial lateral positioning osteotomies. Therefore, the applicant redesigned a tibial extramedullary alignment osteotomy system (TEAOS) that uses MEMS to locate the femoral head center during total knee arthroplasty (TKA) and precisely positions the knee joint. This system allows for fine adjustment of the coronal varus and valgus angles and sagittal posterior tilt angles during tibial osteotomy, undoubtedly resulting in more precise and personalized tibial positioning osteotomies. By combining the previous FEAOS system, a complete knee extramedullary alignment osteotomy system (KEAOS) was designed to achieve better TKA surgical results. Moreover, MEMS-KEAOS still has the characteristics of low cost, simple operation, and close to the traditional TKA surgical procedure, making it easy to learn and promote.

[0036] This application aims to combine MEMS visualization technology to achieve precision in TKA surgery, integrate it into existing surgical procedures, shorten the learning curve, and improve the safety, reliability, and scalability of TKA surgery. Based on this project, the development and design of related navigation equipment will be completed, filling a domestic research gap and breaking the monopoly of similar foreign products. The widespread application of this navigation system will benefit TKA patients and inject new vitality into related medical industries, potentially generating considerable socio-economic benefits.

[0037] This invention provides an extramedullary tibial osteotomy device for knee replacement surgery, such as... Figure 1-8 As shown, it includes the main connecting rod 1, wherein:

[0038] An ankle fixing module 2 is provided below the main connecting rod 1. The ankle fixing module 2 includes an ankle connecting seat 21. An angle adjustment module 3, which can adjust the inversion and supination angles and the forward and backward tilt angles, is provided behind the ankle connecting seat 21. The lower end of the main connecting rod 1 is fixed on the angle adjustment module 3.

[0039] The main connecting rod 1 is equipped with a tibia measurement module 6 and a tibia osteotomy module 4 above it. The upper and lower ends of the main connecting rod 1 are respectively equipped with an upper navigation module 51 and a lower navigation module 52. Both the upper navigation module 51 and the lower navigation module 52 are equipped with remote sensing modules (not shown) for obtaining the tibial varus / valgus angle and anteversion / pronation angle.

[0040] In total knee arthroplasty, a midline incision is used in conventional total knee arthroplasty techniques. The knee joint is exposed via a medial patellar approach. After initial soft tissue balancing, distal femoral osteotomy can be performed on the femoral side using existing extramedullary positioning techniques. On the tibial side, the extramedullary tibial osteotomy device of this invention is used in knee arthroplasty. The operation procedure can be referred to as follows:

[0041] 1. Use a connecting plate to fix the knee joint in a 90° flexion position;

[0042] 2. Using the ankle fixation module 2, fix the lower end of the tibial extramedullary positioning osteotomy device in an ankle-holding manner, and fix the upper end of the tibial extramedullary positioning osteotomy device in front of the intercondylar spine of the tibia (specifically, the tibial measurement module 6 or the subsequent fixation rod 12 can be used). Since the main connecting rod 1 is equipped with an upper navigation module 51 and a lower navigation module 52, the surgeon can obtain the coordinate value of the femoral head center and the initial inversion, valgus and posterior tilt angle data through simple knee joint rotation movements.

[0043] 3. Based on the initial angle data, the angle adjustment module 3 can be adjusted to obtain a satisfactory tilt angle and varus / valgus angle. The surgeon then performs knee joint rotation again to obtain the adjusted osteotomy angle data. This is equivalent to re-verifying the adjusted osteotomy angle, making the osteotomy angle more accurate.

[0044] 4. After obtaining a satisfactory angle, fix the tibial osteotomy module 4 below the tibial plateau. The amount of osteotomy is displayed by the scale on the osteotomy plate. Then, use oblique screws to completely fix the osteotomy plate to complete the extramedullary positioning osteotomy.

[0045] The extramedullary tibial osteotomy device for knee replacement surgery of the present invention, through a simple navigation design, incorporates remote sensing modules on the upper and lower navigation modules to accurately locate the center of the femoral head. An angle adjustment module allows for fine adjustment of the varus, valgus, and kyphosis angles of the tibial osteotomy module, achieving digital, precise, and personalized tibial osteotomy, accurate prosthesis alignment, and low cost, which can significantly reduce medical costs to a certain extent. The device is also simple to operate during surgery, has a short learning curve, and improves the safety, reliability, and scalability of the surgery.

[0046] The main connecting rod 1 can be a height-adjustable structure (such as multiple tubes nested together) to facilitate height adjustment, making it suitable for people with different tibial lengths. Figure 4 As shown, the ankle connector 21 may include a V-shaped plate 211 and straps 212 (specifically flexible straps) connected to both ends of the V-shaped plate 211. Ankle contact pads 213 are provided on the inner side of the V-shaped plate 211, which can firmly fix the ankle and reduce pressure on soft tissues.

[0047] To facilitate adjustment of the inward / outward tilt angle and the forward / backward tilt angle, the angle adjustment module 3 can adopt various methods readily conceived by those skilled in the art, such as using a universal ball joint, etc. However, to facilitate individual adjustment of the inward / outward tilt angle and the forward / backward tilt angle, the present invention preferably adopts the following structure:

[0048] like Figure 4 As shown, the angle adjustment module 3 includes a vertical angle adjustment shaft 31 connected to the rear of the ankle connecting seat 21 (specifically behind the V-shaped plate 211) and extending rearward. A vertical angle adjustment slider 32 is slidably connected to the vertical angle adjustment shaft 31. A horizontal angle adjustment shaft 33 perpendicular to the vertical angle adjustment shaft 31 is provided on the vertical angle adjustment slider 32. A horizontal angle adjustment slider 34 is slidably connected to the horizontal angle adjustment shaft 33. The lower end of the main connecting rod 1 is fixed on the horizontal angle adjustment slider 34.

[0049] In use, the tibial osteotomy angle is adjusted by sliding the adjustment slider on the adjustment axis. Specifically, a satisfactory tilt angle can be obtained by sliding the vertical angle adjustment slider 32 on the vertical angle adjustment axis 31, and a satisfactory inversion / exversion angle can be obtained by sliding the horizontal angle adjustment slider 34 on the horizontal angle adjustment axis 33. The operation is simple and convenient.

[0050] Both the vertical angle adjustment shaft 31 and the horizontal angle adjustment shaft 33 can have a T-shaped cross-section to increase stability during adjustment. To facilitate adjustment and prevent jamming, both the vertical angle adjustment shaft 31 and the horizontal angle adjustment shaft 33 can be curved downwards in the middle. Both the vertical angle adjustment shaft 31 and the horizontal angle adjustment shaft 33 can have graduations for precise adjustment.

[0051] like Figure 1 As shown, to facilitate the connection of the tibial osteotomy module 4, the upper end of the main connecting rod 1 can be provided with a module connecting seat 11, and the tibial measurement module 6 and the tibial osteotomy module 4 are respectively inserted and connected to the module connecting seat 11.

[0052] like Figure 1-2 As shown, the tibial measurement module 6 preferably includes a tibial measurement rod seat 61. The upper part of the tibial measurement rod seat 61 is provided with a tibial measurement rod 62, the middle part is provided with a screw hole 63, and the lower part is provided with a second insertion post 64 that mates with the insertion hole 111 on the module connecting seat 11. During the operation, when the upper half of the extramedullary tibial osteotomy device is fixed in front of the intercondylar spine of the tibia, this tibial measurement module 6 can be used to achieve this. The bone screw can be passed through the screw hole 63 to determine the midline, thereby forming a single-point semi-fixation. Subsequently, when adjusting the varus / valgus angle and anteversion / anteroposterior angle using the angle adjustment module 3, it can be rotated around this fixation point, which facilitates the use of the entire device.

[0053] A pin 621 can be provided at the lower end of the tibia measuring rod 62. Specifically, two pins 621 of different lengths can be designed at both ends. The pin 621 is used to measure the lowest and highest points of the tibia. The pin hole 63 is preferably a vertically extending groove to increase the range of motion and make it easier for the angle adjustment module 3 to adjust the angle.

[0054] like Figure 3 As shown, the tibial osteotomy module 4 may include an osteotomy block 41 and a horizontal adjustment rod 42 hinged to the rear of the osteotomy block 41. The lower end of the horizontal adjustment rod 42 is provided with a first insertion post 43 that mates with the insertion hole 111 on the module connecting seat 11 of the main connecting rod 1. This hinged design allows for shared osteotomy of both legs, and the first insertion post 43 on the horizontal adjustment rod 42 facilitates connection with the main connecting rod 1. The hinge hole on the horizontal adjustment rod 42 can be a slot (not shown) extending along the length of the horizontal adjustment rod 42. This slot design allows for better fit of the tibial osteotomy block. The osteotomy block 41 can be a conventional design in the art, and may have an osteotomy groove (not shown) and several screw holes (not shown).

[0055] To facilitate the partial fixation of the upper end of the tibial extramedullary osteotomy device to the anterior aspect of the tibial intercondylar spine, preferably, the module connector 11 can be provided with an L-shaped fixation rod 12 on the side near the tibia. The fixation rod 12 includes a first rod portion 121 connected to the module connector 11 with a certain resistance ball joint and a second rod portion 122 connected to the first rod portion 121 to abut against the tibial surface. The second rod portion 122 has a nail hole 1221. During operation, firstly, the upper end of the tibial extramedullary osteotomy device (i.e., the upper end of the main connecting rod 1) is adjusted to be located anterior to the tibial intercondylar spine. Then, the fixation rod 12 is adjusted so that the second rod portion 122 abuts against the tibial surface, and a fixation nail is inserted into the nail hole 1221, thereby partially fixing the upper end of the tibial extramedullary osteotomy device to the anterior aspect of the tibial intercondylar spine. Since the first rod portion 121 is connected to the module connector 11 with a ball joint and the ball joint has a certain resistance, it is easy to adjust and will not automatically loosen, affecting the firmness.

[0056] In this invention, the remote sensing module is preferably a MEMS (micro electromechanical systems) remote sensing module, specifically installed on the base of the tibial superior navigation module 51 and the inferior navigation module 52. By shaking the lower limb around the center of the femoral head, the corresponding angle data can be obtained. The remote sensing module is equipped with a three-axis gyroscope and a three-axis accelerometer sensor, which can realize multi-sensor data acquisition, filtering, and multi-layer data deep fusion to ensure data stability and accuracy. Using the MEMS sensor, the center of the femoral head can be located and precisely positioned in total knee arthroplasty, enabling fine adjustment of the varus, valgus, and posterior tilt angles of the tibial osteotomy module, and achieving the positioning of the tibial osteotomy surface.

[0057] The working principle of a multi-core sensor based on MEMS technology: This sensor group uses a three-axis gyroscope and a three-axis accelerometer sensor based on MEMS technology to achieve multi-sensor data acquisition, filtering, and deep fusion of multi-layer data. After ensuring data stability and accuracy requirements, relevant human posture calculations are performed to obtain the results. The MEMS components (i.e., the MEMS remote sensing modules in the upper navigation module 51 and the lower navigation module 52) are installed as follows: Figure 8 As shown:

[0058] After fixing the relative positions of the femur and tibia, by rocking the lower limb around the center of the femoral head, the line vector connecting the main MEMS component (i.e., the MEMS remote sensing module in the upper navigation module 51) and the secondary MEMS component (i.e., the MEMS remote sensing module in the lower navigation module 52) relative to the center of the femoral head can be obtained based on the MEMS rotation center navigation positioning principle. This vector is denoted as... and According to the vector sum and difference rules, the vector from the MEMS component relative to the main MEMS component can be obtained. Right now:

[0059]

[0060] in, The attitude matrix of the slave MEMS component relative to the master MEMS component can be calculated from the attitude matrices of the master and slave MEMS components relative to the ground, i.e.:

[0061]

[0062] In the above process, by compensating for the thickness of the muscle, the tibial lateral vector relative to the center of the tibial transverse section and the center of the ankle joint can be obtained.

[0063] In this invention, the method for obtaining the tibial varus / valgus angle and anteversion / retroversion angle using a remote sensing module may include the following steps:

[0064] Step 1: Through the simple circular motion of the patient's hip and knee joints during the operation, the rotation center of the femoral head is obtained as fixed point A, the knee joint movement point (i.e., the center point of the remote sensing module in the upper navigation module 51) is mass point O1, and the ankle joint movement point (i.e., the center point of the remote sensing module in the lower navigation module 52) is mass point O2.

[0065] In this step, for particles O1 and O2 rotating about a fixed point A, the four-point position Newton iteration method can be used to solve for the center position and determine the position of the fixed point A (e.g., Figure 7-8 (as shown);

[0066] Step 2: Obtain the vectors from fixed point A to mass points O1 and O2 respectively, determine the attitude angle of the remote sensing module itself relative to the force line vectors AO1 and AO2, and obtain the expected tibial lower limb force line osteotomy angle by adjusting the attitude of the remote sensing module. After obtaining the expected tibial lower limb force line osteotomy angle, stop the adjustment and install the tibial osteotomy module 4 to perform the tibial osteotomy operation.

[0067] In this step, when the coronal plane inversion / exversion angle and the sagittal plane posterior tilt angle are both adjusted to within ±1° of error, the tibial force line at this time is considered to be the expected tibial force line. Then the adjustment can be stopped and the tibial osteotomy module 4 can be installed to perform the tibial osteotomy operation.

[0068] like Figure 6As shown, the internal structure of the MEMS remote sensing module (i.e., the measurement end module on the left) may include: a navigation measurement sensor, a data forwarding module (i.e., a WIFI module), and a battery pack (specifically, a 5V lithium battery pack). The remote sensing module can adopt either an integrated structure or a separate design. That is, after the sensor collects data, a host computer is used to perform navigation calculations to obtain the anteversion and lateral tilt angles. The host computer runs femoral head center navigation calculation software, and performs data acquisition and navigation calculations through the data forwarding module. In other words, the tibial extramedullary positioning osteotomy device may also include a host computer (i.e., the navigation calculation and control terminal on the right, specifically a smartphone, computer, etc.) that is connected to the remote sensing module to perform navigation calculations on the data collected by the remote sensing module.

[0069] In summary, the present invention has the following beneficial effects:

[0070] 1. The extramedullary tibial osteotomy device for knee replacement surgery of the present invention allows for fine adjustment of the varus, valgus, and posterior tilt osteotomy angles of the proximal tibia, achieving more precise and personalized coronal and sagittal plane osteotomy positioning of the proximal tibia. The data obtained through the navigator has an error of ±0.6°, and with system installation errors and instrument installation and operation errors, the overall error is ±1°. This achieves digital, precise, and personalized distal tibial osteotomy.

[0071] 2. MEMS sensors can obtain acceleration and acceleration information during knee joint rotation in real time. Utilizing the principle of a simple pendulum, through a simple pendulum dynamics model or by using kinematic calculation of the arc, and by using geometric relationships and low-pass filtering algorithms, the precise position of the pendulum center, i.e. the femoral head, can be obtained. Thus, the osteotomy angle data of tibial varus / valgus and posterior tilt can be obtained on the navigation display.

[0072] 3. The tibial extramedullary osteotomy device for knee replacement surgery proposed in this application, on the one hand, incorporates a positioning adjustment component (i.e., an angle adjustment module) and a MEMS sensing system. This results in more precise, personalized, and digital osteotomy positioning in the coronal and sagittal planes of the distal tibia, more accurate determination of the femoral head center, less surgical trauma, less intraoperative and postoperative bleeding, fewer complications such as deep vein thrombosis and pulmonary embolism, and faster recovery. On the other hand, due to its simple operation, high precision, and relatively low price, it can be used for surgical demonstrations, key explanations, and on-site Q&A sessions to promote the application of extramedullary positioning techniques. It can also be promoted through participation in national orthopedic academic conferences and online remote consultation platforms, facilitating peer exchange and discussion. Furthermore, we can collaborate with medical device manufacturers to conduct in-depth research and development of the tibial extramedullary osteotomy device, obtaining a production license for industrial production. We believe that with the development and promotion of the extramedullary osteotomy device for the tibia, it will play a significant role in reducing the enormous social burden and financial expenditure caused by knee osteoarthritis.

[0073] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tibial extramedullary osteotomy device for knee replacement surgery, characterized in that, Including the main connecting rod, wherein: An ankle fixing module is provided below the main connecting rod. The ankle fixing module includes an ankle connecting seat. An angle adjustment module capable of adjusting the inversion and supination angles and the forward and backward tilt angles is provided behind the ankle connecting seat. The lower end of the main connecting rod is fixed to the angle adjustment module. The main connecting rod is equipped with a tibia measurement module and a tibia osteotomy module above it. The upper end and lower end of the main connecting rod are respectively equipped with an upper navigation module and a lower navigation module. Both the upper navigation module and the lower navigation module are equipped with remote sensing modules for obtaining the tibial varus / valgus angle and anteversion / pronation angle. The angle adjustment module includes a vertical angle adjustment shaft connected to the rear of the ankle connector and extending rearward. A vertical angle adjustment slider is slidably connected to the vertical angle adjustment shaft. A horizontal angle adjustment shaft perpendicular to the vertical angle adjustment shaft is provided on the vertical angle adjustment slider. A horizontal angle adjustment slider is slidably connected to the horizontal angle adjustment shaft. The lower end of the main connecting rod is fixed to the horizontal angle adjustment slider. Both the vertical angle adjustment shaft and the horizontal angle adjustment shaft have T-shaped cross sections; And / or, both the vertical angle adjustment shaft and the horizontal angle adjustment shaft are arc-shaped with the middle part bent downwards; The remote sensing module is a MEMS remote sensing module, which contains a three-axis gyroscope and a three-axis accelerometer sensor. And / or, the tibial extramedullary osteotomy device in the knee replacement surgery also includes a host computer that is communicatively connected to the remote sensing module.

2. The tibial extramedullary osteotomy device for knee replacement surgery according to claim 1, characterized in that, The main connecting rod is a height-adjustable structure; And / or, the ankle connector includes a V-shaped plate and straps connecting the two ends of the V-shaped plate, and an ankle contact pad is provided on the inner side of the V-shaped plate.

3. The tibial extramedullary osteotomy device for knee replacement surgery according to claim 1, characterized in that, The upper end of the main connecting rod is provided with a module connecting seat, and the tibia measurement module and the tibia osteotomy module are inserted and connected to the module connecting seat.

4. The tibial extramedullary osteotomy device for knee replacement surgery according to claim 3, characterized in that, The tibia measurement module includes a tibia measurement rod base, with a tibia measurement rod at the top, a nail hole in the middle, and a second insertion post at the bottom that mates with the insertion hole on the module connector.

5. The extramedullary tibial osteotomy device for knee replacement surgery according to claim 4, characterized in that, The upper part of the tibia measuring rod seat is provided with a measuring rod groove, and the tibia measuring rod is slidably connected in the measuring rod groove; And / or, the two ends of the tibia measuring rod are provided with pins of different lengths below them; And / or, the nail hole is a vertically extending groove.

6. The tibial extramedullary osteotomy device for knee replacement surgery according to claim 3, characterized in that, The tibial osteotomy module includes an osteotomy block and a horizontal adjustment rod hinged to the rear of the osteotomy block. The lower end of the horizontal adjustment rod is provided with a first insertion post that mates with the insertion hole on the module connector. The hinge hole on the horizontal adjustment rod is a slot extending along the length of the horizontal adjustment rod.

7. The tibial extramedullary osteotomy device for knee replacement surgery according to claim 3, characterized in that, The module connector has an L-shaped fixing rod on the side near the tibia. The fixing rod includes a first rod part that is connected to the module connector with a certain resistance ball joint and a second rod part that is connected to the first rod part for abutting against the surface of the tibia. The second rod part has a nail hole.

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