Graphical analysis device for valgus and valgus balance in knee joint replacement

Abstract

The invention relates to a knee joint replacement valgus and valgus balance graphical analysis device, which comprises a gap lattice diagram drawing system, which is configured to obtain force-gap data of soft tissues around a knee joint at different buckling angles and draw an inner side gap-outer side gap lattice diagram; the quantitative index unit is configured to construct quantitative index parameters for measuring the inward and outward turning gap balance according to the inner side gap-outer side gap dot matrix relation under different buckling degrees; and the quantitative analysis system is configured to adjust quantitative index parameters, and formulate an optimization adjustment strategy to carry out inward and outward turning soft tissue balance quantitative analysis according to the inner and outer side gap width difference of the soft tissue around the knee joint at different flexion and extension angles. According to the method, the tension of the soft tissue around the knee joint is quantitatively evaluated according to the force-gap data, the method is used for guiding precise technical adjustment of robot-assisted knee joint replacement, and data and algorithm foundations are laid for analysis methods such as automatic operation plan guidance, prosthesis selection and personalized operations.

Description

Technical Field

[0001] The invention relates to a graphical analysis device for valgus-valgus balance in knee replacement, and relates to the field of knee joints. Background Art

[0002] Knee replacement surgery includes unicompartmental replacement, bicompartmental replacement, tricompartmental replacement, total knee replacement, etc. The success of all procedures depends on the appropriate relative relationship between the prosthesis, bone, and soft tissue, so as to establish a good knee joint kinematics-dynamics pattern after surgery and obtain normal knee joint postoperative function.

[0003] The evaluation and adjustment of valgus and valgus balance in traditional knee replacement surgery is based on the surgeon's personal experience, or a simple mechanical gap measurement, or measurement of force under fixed shim thickness. It cannot evaluate the force-gap relationship, and cannot measure both soft tissue elasticity and working gap width at the same time.

[0004] The evaluation of valgus and varus balance in traditional knee replacement surgery is prone to the following problems: 1) The traditional definition of valgus and varus balance of soft tissues in the knee joint is unclear: the traditional definition of valgus and varus balance of soft tissues in the knee joint is defined as the difference between the medial and lateral gaps <2mm, but there is a lack of regulations on the force for measuring the gap width, and a lack of corresponding standardized hardware measurement tools, resulting in a vague and controversial definition of valgus and varus balance, which in turn leads to postoperative complications such as flexion dysfunction, valgus and varus deformity, valgus and varus instability, knee dislocation, prosthesis wear, loosening, etc. 2) The traditional valgus and varus adjustment technology of the knee joint lacks quantitative evaluation: the traditional definition of flexion and extension balance of soft tissues in the knee joint is defined as the difference between the flexion gap and the extension gap <2mm, but there is also a lack of regulations on the force for measuring the gap width, and a lack of corresponding standardized hardware measurement tools, resulting in great deviations in the intraoperative operation of valgus and varus balance, and the inability to quantitatively analyze the valgus and varus balance of soft tissues, resulting in intraoperative balance difficulties, postoperative valgus and varus instability, knee pain, flexion and extension dysfunction, and surgical failure. 3) Insufficient accuracy in the internal and external valgus balance of knee replacement soft tissue: Traditional mechanical measurement cannot reflect the quantitative relationship between the force-gap changes of the knee soft tissue. Due to the lack of quantitative force-gap measurement, it is impossible to quantitatively analyze the tension characteristics of the internal and external soft tissues of the knee at different flexion and extension angles and guide the precise balance technology of the soft tissue, resulting in a mismatch between the soft tissue and the artificial joint prosthesis, causing postoperative complications such as soft tissue imbalance, pain, instability, knee stiffness, and prosthesis loosening. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a graphical analysis device for valgus and varus balance of knee replacement based on force-gap measurement, which can establish an accurate and intelligent guidance adjustment plan for valgus and varus balance of knee replacement.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is: The present invention provides a graphical analysis device for valgus and valgus balance of knee replacement, the device comprising: A gap dot-matrix drawing system is configured to obtain force-gap data of soft tissues around the knee joint at different flexion angles and draw a medial gap-lateral gap dot-matrix drawing; A quantitative index unit is configured to construct a quantitative index parameter for measuring the balance of the varus and valgus gaps according to a medial gap-lateral gap dot relationship under different flexion degrees; The quantitative analysis system is configured to adjust the quantitative index parameters and formulate an optimized adjustment strategy to perform quantitative analysis of the inside-outside soft tissue balance based on the difference in the width of the medial and lateral gaps of the soft tissue around the knee joint at different flexion and extension angles.

[0007] Furthermore, the drawing of the medial gap-lateral gap dot matrix includes: after completing the preliminary osteotomy operation of the tibia and femur of the knee joint, measuring the medial compartment and lateral compartment knee joint force-gap width data from the knee joint extension position to the end position of flexion at different set angles and different knee flexion angles through a knee joint force-gap solver, and drawing the corresponding medial gap-lateral gap dot matrix.

[0008] Furthermore, the quantitative index parameters for measuring the balance of valgus and valgus gaps are defined as follows: the relationship between the distance d and the slope k between the dot matrix and the y=x line at different flexion positions of the knee joint is defined as the quantitative index parameters of the balance state, d=the distance from the center point of the dot matrix to the y=x line, y=kx+b is the linear regression fitting line of the knee joint dot matrix at a certain flexion degree, k is the slope of the line, and b is the intercept of the vertical axis.

[0009] Furthermore, d represents the shortest distance of the medial and lateral gaps close to the y=x line along the y=-x direction when the medial and lateral soft tissues of the knee joint are balanced under moderate force load at this flexion degree, which is equal to the required movement range when the medial and lateral gaps are adjusted proportionally, wherein, d>0 is defined as the dot matrix being located above the y=x line; d<0 is defined as the dot matrix being located below the y=x line; k represents the elasticity difference between the medial and lateral soft tissues, forming a quantitative evaluation of the difference in rigidity of the medial and lateral soft tissues, and when k=1, the elasticity of the medial and lateral sides is the same, when k>1, the outer side is more elastic than the inner side, and when k<1, the outer side is less elastic than the inner side.

[0010] Furthermore, the quantitative analysis system includes a quantitative analysis unit for valgus and valgus balance, a parameter adjustment unit, a prosthesis rotation quantitative adjustment flexion gap unit, and a prosthesis valgus and valgus gap analysis unit; The quantitative analysis unit for valgus and valgus balance is configured to perform quantitative analysis according to different requirements of valgus and valgus balance on soft tissues at different flexion positions of the knee joint, and obtain the optimal targets of parameters k and d; The parameter adjustment unit is configured to adjust the imbalance of the inner and outer soft tissue gaps by adjusting the abnormal k and d parameters to complete soft tissue release; The prosthesis rotation quantitative adjustment flexion gap unit is configured to determine the relationship between the prosthesis rotation degree and the flexion gap change; The prosthesis internal and external eversion gap analysis unit is configured to formulate an optimization adjustment strategy and perform internal and external eversion soft tissue balance analysis according to the current flexion-extension balance state and the desired flexion-extension balance target.

[0011] Furthermore, the optimal target lattice distribution of k and d is k>1, d≈0, that is, the lattice distribution should intersect with the y=x line, but the slope is larger than y=x.

[0012] Furthermore, the rotation center position W1 / W2 of the femoral prosthesis determines the different influence ratios of the prosthesis rotation degree on the medial and lateral gaps, and the corresponding coefficient is the size of the dot matrix moving along the y=-mx direction: dGm=W1×sinθ dGl=W2×sinθ m=dGm / dGl=W1 / W2 Wherein, W1 is the distance from the rotation center of the femoral prosthesis to the edge of the medial condyle; W2 is the distance from the rotation center of the femoral prosthesis to the edge of the lateral condyle; θ is the rotation angle of the femoral prosthesis; dGm is the width of the change in the medial gap after the prosthesis is rotated θ degrees; dGl ​​is the width of the change in the lateral gap after the prosthesis is rotated θ degrees; m is the direction slope of the lattice movement after the prosthesis is rotated θ degrees.

[0013] Furthermore, the imbalance of the inner and outer soft tissue gaps includes: k>1.5 or k<0.5, the difference in the stiffness of the inner and outer soft tissues is more than 50%, which is considered to be an imbalance in the inner and outer elasticity; d>2mm, the difference in the absolute width of the inner and outer soft tissue gaps is greater than 2mm, which is considered to be an imbalance in the inner and outer soft tissue gaps.

[0014] Furthermore, the optimized adjustment strategies include minimal soft tissue release strategy and appropriate soft tissue release strategy.

[0015] Furthermore, the strategy of minimal soft tissue release is: minimize soft tissue release to reduce pain, and change the d value by osteotomy and translation lattice to achieve valgus and valgus balance; The appropriate soft tissue release strategy is: when the change in the osteotomy adjustment capacity d value reaches the limit, the valgus stiffness k value and d value are adjusted through soft tissue release to achieve the comprehensive optimal solution of force-gap-force line, while satisfying the physiological force load conditions, and the gap balance-force line deviation are within an acceptable range.

[0016] The present invention adopts the above technical solution, and has the following characteristics: 1. The present invention measures the force-gap data of the soft tissue around the knee joint at different flexion angles to form a medial gap-lateral gap dot matrix containing mechanical information, and quantitatively analyzes the balance state of the varus and valgus gaps of the knee joint by analyzing the position and shape distribution information of the graph.

[0017] 2. The present invention quantitatively evaluates the tension of soft tissues around the knee joint based on force-gap data, and can establish key mathematical description indicators k and d for the valgus-valgus gap balance of knee replacement, which is of great significance for evaluating the valgus-valgus balance of knee replacement and guiding precise surgical techniques. It can be used to guide the precise technical adjustment of robot-assisted knee replacement, and lay the data and algorithm foundation for analytical methods such as automated surgical plan guidance, prosthesis selection, and personalized surgery.

[0018] In summary, the present invention can be widely used in the graphical analysis of valgus and valgus balance in knee replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 This is a data diagram of the inner clearance and outer clearance of an embodiment of the present invention; Figure 2 This is an analysis diagram of the inner clearance-outer clearance data diagram of an embodiment of the present invention; Figure 3 This is an analysis diagram of the inner clearance-outer clearance data diagram of an embodiment of the present invention; Figure 4 A quantitative analysis diagram of the flexion clearance of the femoral prosthesis during rotation adjustment according to an embodiment of the present invention; Figure 5 This is a quantitative analysis diagram of the adjustment of the internal and external valgus gap of the tibial and femoral prostheses according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0021] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0022] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0023] Since the evaluation and adjustment of the valgus and varus balance of traditional knee replacement is based on the surgeon's personal experience, or a simple mechanical gap measurement is used, or the force under the fixed gasket thickness is measured, the correlation between the force and the gap cannot be evaluated, and the two indicators of the elasticity of the soft tissue and the working gap width cannot be measured simultaneously. The present invention provides a graphical analysis device for the valgus and varus balance of knee replacement, which includes: a gap dot plotting system, which is configured to obtain the force-gap data of the soft tissue around the knee joint at different flexion angles, and draw a medial gap-lateral gap dot plot; a quantitative index unit, which is configured to construct a quantitative index parameter for measuring the valgus and varus gap balance according to the medial gap-lateral gap dot plot relationship under different flexion degrees; a quantitative analysis system, which is configured to adjust the quantitative index parameter, and formulate an optimization adjustment strategy according to the difference in the width of the medial and lateral gaps of the soft tissue around the knee joint at different flexion and extension angles to perform quantitative analysis of the valgus and varus soft tissue balance. The present invention forms a medial gap-lateral gap dot plot containing mechanical information by measuring the force-gap data of the soft tissue around the knee joint at different flexion angles; and quantitatively analyzes the valgus and varus gap balance state of the knee joint by analyzing the position and shape distribution information of the graph.

[0024] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0025] The graphical analysis device for valgus and valgus balance of knee replacement based on force-gap measurement provided in this embodiment can be implemented by software, hardware or a combination of software and hardware. For the convenience of description, the present embodiment is described separately by functions divided into various units. Of course, the functions of each unit can be implemented in the same or multiple software and / or hardware during implementation. The embodiment of the graphical analysis device for valgus and valgus balance of knee replacement provided by the present invention is merely illustrative.

[0026] The graphical analysis device for valgus and valgus balance of knee replacement provided in this embodiment includes: The gap dot matrix drawing system is configured to obtain force-gap data of soft tissues around the knee joint at different flexion angles and draw a medial gap-lateral gap dot matrix.

[0027] The quantitative index unit is configured to construct a quantitative index for measuring the balance of the valgus and valgus gaps according to the medial gap-lateral gap dot relationship under different flexion degrees, and is used to measure the difference in soft tissue elasticity (stiffness) and the difference in gap width.

[0028] The quantitative analysis system is configured to formulate an optimized adjustment strategy to conduct quantitative analysis of the inside-outside soft tissue balance and guide soft tissue release based on the difference in the width of the medial and lateral gaps of the soft tissues around the knee joint at different flexion and extension angles.

[0029] In a preferred embodiment of the present invention, a gap dot map drawing system draws a medial gap-lateral gap dot map, including: after completing the preliminary osteotomy operation of the tibia and femur of the knee joint, measuring the medial compartment and lateral compartment knee joint force-gap width data at different set angles such as 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, etc. from the knee extension position to the flexion end point through a knee joint force-gap solver, and drawing the corresponding medial gap-lateral gap dot map. The selection of the knee joint flexion angle can be adjusted as appropriate according to actual conditions, including increasing, decreasing or changing any degree, which is not limited here.

[0030] Furthermore, if Figures 1 to 3 Shown is the medial gap-lateral gap distribution dot matrix and analysis drawn based on the force-gap data, where the horizontal axis is the medial gap width, the vertical axis is the lateral gap width, the y=x straight line is the medial gap = lateral gap trend line, and each point represents the measurement data of a knee joint in flexion and extension position. Each set of data contains the medial and lateral gap widths measured under the regular arrangement of the medial-lateral gap force of the knee joint from small to large, and the magnitude of the measured force is within the range freely defined by the surgeon.

[0031] In a preferred embodiment of the present invention, the quantitative indicator unit constructs a key quantitative indicator for measuring the balance of the varus and valgus gaps to define the relationship between the distance d and the slope k between the dot matrix of the knee joint in different flexion positions and the y=x line as a quantitative indicator of the balance state, d=the distance from the center point of the dot matrix (the point corresponding to the average value of the x-axis variation range in the dot matrix - the average value of the y-axis variation range) to the y=x line, y=kx+b is the linear regression fitting line of the knee joint dot matrix under a certain flexion degree, k is the slope of the line, and b is the intercept of the vertical axis. A balance strategy can be formulated according to the size relationship between the flexion and extension gaps k and d.

[0032] Furthermore, the clinical physical significance of k and d is as follows: d represents the shortest distance of the medial and lateral gaps close to the y=x line along the y=-x direction under the moderate force load (force load corresponding to the center point of the dot matrix) of the medial and lateral soft tissues of the knee joint under the flexion degree, which is equal to the required range of movement when the medial and lateral gaps are adjusted proportionally, where d>0 is defined as the dot matrix located above the y=x line; d<0 is defined as the dot matrix located below the y=x line. k represents the difference in elasticity of the medial and lateral soft tissues, forming a quantitative evaluation of the difference in rigidity of the medial and lateral soft tissues. When k=1, the elasticity of the medial and lateral sides is the same; when k>1, the lateral side is more elastic than the medial side; when k<1, the lateral side is less elastic than the medial side.

[0033] In a preferred embodiment of the present invention, the quantitative analysis system includes a quantitative analysis valgus and valgus balance unit, a parameter adjustment unit, a prosthesis rotation quantitative adjustment flexion gap unit and a prosthesis valgus and valgus gap analysis unit, wherein: The quantitative analysis of varus-valgus balance unit is configured to quantitatively analyze the different requirements of varus-valgus balance on soft tissues in different flexion positions of the knee joint, and obtain the optimal targets of parameters k and d. Among them, in the extension position: the knee joint requires high stability, the difference in elasticity of the inner and outer soft tissues is small, the inner and outer posterior joint capsules participate in varus-valgus balance, and the stability is increased by the torsion locking mechanism. Therefore, the optimal lattice distribution is k≈1, d≈0, that is, the lattice distribution overlaps with the y=x line; k≈1 represents that the elasticity of the inner and outer soft tissues is similar, and d≈0 represents that the tension and gap width of the inner and outer joints are similar in the static state. In the flexion position: the typical knee joint soft tissue balance forms an "S"-shaped ("silkworm"-shaped) distribution feature, the head (upper 1 / 3) represents the area with greater distraction force, the body (middle 1 / 3) represents the area with moderate distraction force, and the tail (lower 1 / 3) represents the area with less distraction force. Linear regression of the middle 1 / 3 area can obtain the y=kx+b straight line, and the distance d from the middle 1 / 3 linear area to the y=x line can also be obtained. When the knee joint is flexed, a moderate lateral degree of freedom is required. Therefore, the lateral elastic modulus (stiffness) needs to be smaller than that of the medial side, and the lateral gap variation range is larger than that of the medial side. Therefore, the optimal lattice distribution in the flexion position should be k>1, d≈0, that is, the lattice distribution should intersect with the y=x line, but the slope should be appropriately larger than y=x.

[0034] A parameter adjustment unit is configured to adjust abnormal k and d parameters, k>1.5 or k<0.5 is defined as a difference of more than 50% in the stiffness of the inner and outer soft tissues, which is considered to be an imbalance in the inner and outer elasticity; d>2mm is defined as a difference of more than 2mm in the absolute width of the inner and outer soft tissue gaps, which is considered to be an imbalance. Tables 1 and 2 are the logic and strategy for soft tissue balance assessment based on k and d values.

[0035] In this embodiment, the extended position and the flexed position are shown in Table 1 and Table 2.

[0036] Table 1 straight position

[0037] Table 2 Flexion position

[0038] The prosthesis rotation quantitative adjustment flexion gap unit is configured to determine the relationship between the prosthesis rotation degree and the flexion gap change. Specifically, Figure 4As shown in the figure, the rotation center position of the femoral prosthesis (W1 / W2) determines the different influence ratios of the prosthesis rotation degree on the medial and lateral gaps, and the corresponding coefficient is the size of the dot matrix moving along the y=-mx direction (moving to the lower right when the femur is externally rotated, and moving to the upper left when the femur is internally rotated).

[0039] dGm=W1×sinθ dGl=W2×sinθ m=dGm / dGl=W1 / W2 Wherein, W1 is the distance from the rotation center of the femoral prosthesis to the edge of the medial condyle; W2 is the distance from the rotation center of the femoral prosthesis to the edge of the lateral condyle; θ is the rotation angle of the femoral prosthesis; dGm is the width of the change in the medial gap after the prosthesis is rotated θ degrees; dGl ​​is the width of the change in the lateral gap after the prosthesis is rotated θ degrees; m is the direction slope of the lattice movement after the prosthesis is rotated θ degrees.

[0040] like Figure 5 As shown in the figure, the rotation center position of the femoral prosthesis (W1 / W2) determines the different influence ratios of the prosthesis rotation degree on the medial and lateral gaps, and the corresponding coefficient is the size of the coefficient of the dot matrix moving along the y=-mx direction at all flexion degrees (moving to the lower right when the osteotomy is varus, and moving to the upper left when the osteotomy is valgus). The method of coronal osteotomy of the femoral prosthesis is the same.

[0041] dGm=W1×sinθ dGl=W2×sinθ m=dGm / dGl=W1 / W2.

[0042] The prosthesis internal and external valgus gap analysis unit is configured to formulate an optimization adjustment strategy to balance the internal and external valgus soft tissue according to the current flexion-extension balance state and the flexion-extension balance goal that the surgeon wants to achieve. Specifically, an optimized adjustment plan for surgery can be formulated according to the current flexion-extension balance state and the flexion-extension balance goal that the surgeon wants to achieve, and the doctor can choose different strategies to balance the internal and external valgus soft tissue.

[0043] Furthermore, the optimization adjustment strategy includes the minimal soft tissue release strategy and the appropriate soft tissue release strategy.

[0044] The strategy of minimal soft tissue release is to minimize soft tissue release to reduce pain, and achieve valgus / valgus balance by osteotomy and translation of the lattice (changing the d value). However, this cannot change the adaptation relationship between the stiffness of the soft tissues. For some patients, such as those with severe valgus and varus deformities, the amount of osteotomy may exceed the force line and the tolerance range of the prosthetic material. Patients with severe valgus / valgus deformities cannot restore normal medial / lateral relaxation.

[0045] The appropriate soft tissue release strategy is: when the osteotomy adjustment ability (lattice translation, d value change) reaches the limit (for example, tibial varus / valgus degree deviation ≤3°), adjust the varus / valgus stiffness (k value, lattice slope and shape) and d value (lattice translation) by adjusting soft tissue release, so as to achieve the comprehensive optimal solution of force-gap-force line (while satisfying the physiological force load conditions, gap balance-force line deviation are within an acceptable range).

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A graphical analysis device for valgus and valgus balance in knee replacement, characterized in that: The device includes: A gap dot-matrix drawing system is configured to obtain force-gap data of soft tissues around the knee joint at different flexion angles and draw a medial gap-lateral gap dot-matrix drawing; A quantitative index unit is configured to construct a quantitative index parameter for measuring the balance of the varus and valgus gaps according to a medial gap-lateral gap dot relationship under different flexion degrees; The quantitative analysis system is configured to adjust the quantitative index parameters and formulate an optimized adjustment strategy to perform quantitative analysis of the inside-outside soft tissue balance based on the difference in the width of the medial and lateral gaps of the soft tissue around the knee joint at different flexion and extension angles.

2. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 1, characterized in that: The method of drawing the medial gap-lateral gap dot matrix includes: after completing the preliminary osteotomy of the tibia and femur of the knee joint, measuring the medial compartment and lateral compartment knee joint force-gap width data when the knee joint is from the extension position to the flexion end position at each set knee flexion angle through a knee joint force-gap solver, and drawing the corresponding medial gap-lateral gap dot matrix.

3. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 1, characterized in that: The quantitative index parameters for measuring the balance of valgus and valgus gaps are defined as follows: the relationship between the distance d and the slope k between the dot matrix of the knee joint at different flexion positions and the y=x line is defined as the quantitative index parameters of the equilibrium state, d=the distance from the center point of the dot matrix to the y=x line, y=kx+b is the linear regression fitting line of the knee joint dot matrix at a certain flexion degree, k is the slope of the line, and b is the intercept of the vertical axis.

4. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 3, characterized in that: d represents the shortest distance of the medial and lateral gaps close to the y=x line along the y=-x direction when the medial and lateral soft tissues of the knee are balanced under moderate force load at this flexion degree, which is equal to the required movement range when the medial and lateral gaps are adjusted proportionally. Among them, d>0 is defined as the dot matrix is ​​located above the y=x line; d<0 is defined as the dot matrix is ​​located below the y=x line; k represents the elastic difference between the medial and lateral soft tissues, which forms a quantitative evaluation of the difference in rigidity of the medial and lateral soft tissues. When k=1, the elasticity of the medial and lateral sides is the same; when k>1, the lateral side is more elastic than the medial side; when k<1, the lateral side is less elastic than the medial side.

5. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 3 or 4, characterized in that: The quantitative analysis system includes a quantitative analysis valgus and valgus balance unit, a parameter adjustment unit, a prosthesis rotation quantitative adjustment flexion gap unit and a prosthesis valgus and valgus gap analysis unit; The quantitative analysis unit for valgus and valgus balance is configured to perform quantitative analysis according to different requirements of valgus and valgus balance on soft tissues at different flexion positions of the knee joint, and obtain the optimal targets of parameters k and d; The parameter adjustment unit is configured to adjust the imbalance of the inner and outer soft tissue gaps by adjusting the abnormal k and d parameters to complete soft tissue release; The prosthesis rotation quantitative adjustment flexion gap unit is configured to determine the relationship between the prosthesis rotation degree and the flexion gap change; The prosthesis internal and external eversion gap analysis unit is configured to formulate an optimization adjustment strategy and perform internal and external eversion soft tissue balance analysis according to the current flexion-extension balance state and the desired flexion-extension balance target.

6. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 5, characterized in that: The optimal target lattice distribution of k and d is k>1, d≈0.

7. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 5, characterized in that: The rotation center position W1 / W2 of the femoral prosthesis determines the different influence ratios of the prosthesis rotation degree on the medial and lateral gaps, and the corresponding coefficient is the size of the dot matrix moving along the y=-mx direction: dGm=W1×sinθ dGl=W2×sinθ m=dGm / dGl=W1 / W2 Where, W1 is the distance between the rotation center of the femoral prosthesis and the edge of the medial condyle; W2 is the distance between the rotation center of the femoral prosthesis and the edge of the lateral condyle; θ is the rotation angle of the femoral prosthesis; dGm is the width of the medial gap change after the prosthesis rotates θ degrees; dGl ​​is the width of the lateral gap change after the prosthesis rotates θ degrees; m is the slope of the direction of lattice movement after the prosthesis rotates θ degrees.

8. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 1, characterized in that: The imbalance of the medial and lateral soft tissue gaps is defined as: k>1.5 or k<0.5 means that the difference in stiffness of the medial and lateral soft tissues is more than 50%, which is considered to be an imbalance in elasticity; d>2mm means that the difference in absolute width of the medial and lateral soft tissue gaps is greater than 2mm, which is considered to be an imbalance in soft tissue gaps.

9. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 5, characterized in that: The optimization adjustment strategies include minimal soft tissue release strategy and appropriate soft tissue release strategy.

10. The graphical analysis device for valgus and valgus balance of knee replacement according to claim 9, characterized in that: The strategy for minimum soft tissue release is to minimize soft tissue release to reduce pain, and to achieve valgus-valgus balance by changing the d value through osteotomy translation lattice. The strategy for appropriate soft tissue release is to adjust the valgus-valgus stiffness k value and d value through soft tissue release when the d value change of osteotomy adjustment ability reaches the boundary, so as to achieve the comprehensive optimal solution of force-gap-force line, and at the same time, meet the physiological force load conditions, and the gap balance-force line deviation are within the acceptable range.

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