Femoral condyle prosthesis and femoral prosthesis with the femoral condyle prosthesis
By adjusting the position of the patellar trajectory line in the femoral condyle prosthesis to be located lateral to the midpoint of the intercondylar fossa, and optimizing the design of the trochlear groove, the problem of anterior knee pain was solved and the comfort of the knee joint during major flexion movements was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 北京纳通医学研究院有限公司
- Filing Date
- 2023-02-15
- Publication Date
- 2026-06-05
AI Technical Summary
In existing knee prosthesis designs, the patellar trajectory line is located medial to the midpoint of the intercondylar fossa, resulting in frequent anterior knee pain during large flexion movements, especially noticeable when standing up from a chair, going up and down stairs.
A femoral condyle prosthesis is designed so that the patellar trajectory line of the prosthesis is located lateral to the midpoint of the intercondylar fossa, reducing the tension of the patellofemoral ligament. The path of the patellar trajectory line is optimized by adjusting the offset distance and valgus angle of the trochlear groove.
It significantly reduced the incidence of anterior knee pain, improved the comfort of large knee flexion movements, and reduced patellofemoral ligament tension and contact stress.
Smart Images
Figure CN116211551B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, specifically to a femoral condyle prosthesis and a femoral prosthesis having a femoral condyle prosthesis. Background Technology
[0002] Osteoarthritis of the knee (OA) is a common, chronic, irreversible knee joint disease characterized by degenerative changes in articular cartilage and secondary bone hyperplasia. The primary treatment for end-stage knee OA is joint replacement. Knee replacement involves using a knee prosthesis to replace the diseased bone tissue in the knee joint, reducing or relieving pain and restoring and reconstructing the function of the natural knee joint.
[0003] However, 10-20% of patients still experience anterior knee pain after joint replacement surgery. Anterior knee pain primarily occurs during activities such as standing up from a chair, climbing stairs, and descending stairs; gait movements are not the most common cause of anterior knee pain. The patella gradually descends as the tibia and femoral flexion angle increases. During gait, because the maximum tibia and femoral flexion angle is only 60 degrees, the patella mainly moves above the femoral trochlea. However, during activities such as standing up from a chair, climbing stairs, and descending stairs, the tibia and femoral flexion angle often exceeds 90 or 100 degrees, and the patella can often slide to the lowest point of the femoral trochlea, or even the intercondylar fossa. Related techniques, such as... Figure 1 As shown, the intercondylar fossa of the femoral condyle and the trajectory line of the prosthetic patella were not taken into account, which led to increased tension in the patellofemoral ligament during exercise, resulting in pain during exercise. Summary of the Invention
[0004] This invention aims to at least partially address one of the technical problems in related art. To this end, embodiments of the invention provide a femoral condyle prosthesis. This femoral condyle prosthesis can reduce anterior knee pain during major knee flexion movements.
[0005] An embodiment of the present invention also proposes a femoral prosthesis.
[0006] The femoral condyle prosthesis of this invention includes a femoral condyle, which includes a medial condyle and a lateral condyle for corresponding engagement with the tibia. The medial condyle and the lateral condyle are connected to each other to form an anterior condylar surface. The anterior condylar surface has a central depression that forms a trochlear groove for receiving the patella. The line connecting the lowest points of the trochlear groove is the prosthesis patella trajectory line. At the lowest point of the trochlear groove of the femoral condyle, near the intercondylar fossa, the prosthesis patella trajectory line is located lateral to the midpoint of the intercondylar fossa.
[0007] The femoral condyle prosthesis of this invention significantly reduces the incidence of anterior knee pain by positioning the starting point of the patellar trajectory line of the prosthesis lateral to the midpoint of the intercondylar fossa, thereby reducing patellofemoral ligament tension at larger flexion angles. In related technologies, the patellar trajectory line of the prosthesis is located medial to the midpoint of the intercondylar fossa. This results in increased patellofemoral ligament tension during movement, leading to abnormal movement and pain. The femoral condyle prosthesis of this invention, with its patellar trajectory line located lateral to the midpoint of the intercondylar fossa, reduces patellofemoral ligament tension and patellofemoral contact stress, thus avoiding the problem of movement-related pain.
[0008] Therefore, the femoral condyle prosthesis of the present invention can reduce anterior knee pain during major knee flexion movements.
[0009] In some embodiments, the distance between the patellar prosthesis trajectory line and the centerline of the prosthesis is the trochlear groove offset distance, and the angle between the patellar prosthesis trajectory line and the centerline of the prosthesis is the trochlear groove eversion angle;
[0010] The femoral condyle prosthesis has a center of rotation and a first reference line and a second reference line connecting the center of rotation. The angle between the first reference line and the second reference line is α. The first reference line is perpendicular to the long axis of the femur. The second reference line is located above the starting point of the lowest point of the trochlear groove near the intercondylar fossa. The offset distance at the position of the second reference line is positively correlated with the angle of eversion of the trochlear groove.
[0011] In some embodiments, when α is 30°, the offset distance of the trolley groove is related to the outward turning angle of the trolley groove as y1=k1x1+b1; where x1 is the outward turning angle of the trolley groove, y1 is the offset of the trolley groove, k1 and b1 are constants, k1 is 0.1 to 0.15, and b1 is -9mm to 7mm.
[0012] In some embodiments, k1 is 0.11 to 0.13 and b1 is -8.6 mm to 6.56 mm.
[0013] In some embodiments, the offset y1 of the trolley groove is from -3.1 mm to 6.1 mm.
[0014] In some embodiments, the femoral condyle prosthesis further has a third reference line connecting the rotation center and the patellar trajectory line of the prosthesis. The third reference line is located above the starting point of the lowest point of the trochlear groove near the intercondylar fossa. The second reference line is located between the first reference line and the third reference line. The angle between the third reference line and the first reference line is β. The trochlear groove offset distance at the position of the second reference line is positively correlated with the trochlear groove offset distance at the position of the third reference line.
[0015] In some embodiments, when α is 30° and β is 50°, the offset distance of the trolley groove at the second reference line position and the offset distance of the trolley groove at the third reference line position conform to y2=k2y1+b2; where y2 is the offset distance of the trolley groove at the third reference line position, and y1 is the offset distance of the trolley groove at the second reference line position; k2 and b2 are constants, k2 is 0.65mm to 0.85mm, and b2 is -4.5mm to 9mm.
[0016] In some embodiments, k2 is 0.68 mm to 0.83 mm, and b2 is -4.3 mm to 8.7 mm.
[0017] In some embodiments, y2 is 0.1 mm to 6.5 mm.
[0018] In some embodiments, y1 is -3.1 mm to 6.1 mm.
[0019] In some embodiments, when the femoral condyle prosthesis is applied to a female patient, y2 is -0.6 mm to 6.5 mm; when the femoral condyle prosthesis is applied to a male patient, y2 is -2.5 mm to 6.5 mm.
[0020] In some embodiments, when α is 30° and β is 70°, the offset distance of the trolley groove at the second reference line position and the offset distance of the trolley groove at the third reference line position conform to y2=k2y1+b2; where y2 is the offset distance of the trolley groove at the third reference line position, y1 is the offset distance of the trolley groove at the second reference line position; k2 and b2 are constants, k2 is 0.3mm to 0.6mm, and b2 is -4mm to 8mm.
[0021] In some embodiments, k2 is 0.32 mm to 0.57 mm, and b2 is -3.5 mm to 7.7 mm.
[0022] In some embodiments, y2 is 0.1 mm to 6.1 mm.
[0023] In some embodiments, y1 is -3.1 mm to 6.1 mm.
[0024] In some embodiments, the outward angle of the pulley groove is -5° to 15°.
[0025] The femoral prosthesis of this invention may include the femur and a femoral condyle prosthesis according to any of the preceding claims, the femoral condyle prosthesis being disposed at the distal end of the femur. Attached Figure Description
[0026] Figure 1 This is a coronal view of a femoral condyle prosthesis in the relevant technology, illustrating the trajectory of the trochlear groove of the prosthesis in the prior art.
[0027] Figure 2 This is a coronal view of the femoral condyle prosthesis according to an embodiment of the present invention, illustrating the trajectory of the trochlear groove of the prosthesis according to the embodiment of the present invention.
[0028] Figure 3 This is a cross-sectional view of the femoral condyle prosthesis along the midpoint of the intercondylar fossa according to an embodiment of the present invention, and also shows the original femoral condyle.
[0029] Figure 4 This is a cross-sectional view of the femoral condyle prosthesis according to an embodiment of the present invention.
[0030] Figure label:
[0031] Femoral condyle 1; medial condyle 11; lateral condyle 12; patellar prosthesis trajectory line 13; rotation center 15; first reference line 16; second reference line 17; third reference line 18;
[0032] Original femoral condyle 2;
[0033] Related techniques: femoral condyle; medial condyle 11 ， ; Lateral condyle 12 ， ; Patellar prosthesis trajectory line 13 ， . Detailed Implementation
[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0035] Based on basic anatomical positioning, the human body can be defined by three typical mutually perpendicular axes: the sagittal axis, a horizontal line running anteroposteriorly; the coronal (frontal) axis, a horizontal line running laterally; and the vertical axis, a perpendicular line running vertically. The human body or organs can be cut into different sections according to these axes. The sagittal plane is a vertical section along the sagittal axis, dividing the body into left and right parts; the coronal plane is a vertical section along the coronal axis, dividing the body into anterior and posterior parts; and the horizontal or transverse plane is a horizontal section along a horizontal line, dividing the body into superior and inferior parts, and is perpendicular to the two aforementioned longitudinal sections.
[0036] The following is for reference. Figures 2-4 This invention describes a femoral condyle prosthesis according to an embodiment of the present invention.
[0037] The femoral condyle prosthesis of this invention includes a femoral condyle 1, which includes a medial condyle 11 and a lateral condyle 12 for corresponding engagement with the tibia. The medial condyle 11 and the lateral condyle 12 are connected to each other to form an anterior condylar surface. The middle depression of the anterior condylar surface forms a trochlear groove for receiving the patella. The line connecting the lowest points of the trochlear groove is the prosthesis patella trajectory line 13. At the lowest point of the trochlear groove of the femoral condyle 1, near the intercondylar fossa, the prosthesis patella trajectory line 13 is located lateral to the midpoint (not marked) of the intercondylar fossa.
[0038] The femoral condyle prosthesis of this invention, with its patellar trajectory line 13 located lateral to the midpoint (not shown) of the intercondylar fossa, reduces patellofemoral ligament tension at larger flexion angles, significantly decreasing the likelihood of pain. Related technologies' trochlear groove designs emphasize either varus or valgus rotation; see reference... Figure 1 As shown, the related technology's femoral condyles include a medial condyle 11 and a lateral condyle 12 for corresponding engagement with the tibia; however, the inventors' verification revealed that whether the lowest point of the prosthesis's trochlear groove is positioned more medially or laterally has a greater impact on anterior knee pain. In particular, the lowest point of the trochlear groove near the intercondylar fossa below the trochlear groove should be designed more laterally to maximize the restoration of the human trochlear groove position. Furthermore, in the related technology, the prosthesis patellar trajectory line 13... ， Located medial to the midpoint of the intercondylar fossa (not marked). This increases the tension on the patellofemoral ligament during movement, leading to abnormal movement and pain. In this embodiment of the invention, the femoral condyle prosthesis has its patellar trajectory line 13 located lateral to the midpoint of the intercondylar fossa (not marked), reducing patellofemoral ligament tension and patellofemoral contact stress, thereby avoiding the problem of pain during movement.
[0039] Therefore, the femoral condyle prosthesis of the present invention can reduce anterior knee pain during major knee flexion movements.
[0040] For example, Figure 3 The dashed line represents the femoral condyle in the femoral condyle prosthesis, while the solid line represents the outline of the original femoral condyle 2.
[0041] The patellar prosthesis trajectory line 13 is located below the intercondylar fossa of femoral condyle 1, and is situated lateral to the trochlear groove.
[0042] The femoral condyle prosthesis of this invention allows more than 75% of the prosthesis trochlear groove to be located outside the human trochlear groove, reducing patellofemoral ligament tension and patellofemoral contact stress, thereby avoiding pain.
[0043] like Figure 3 and Figure 4As shown, the distance between the patellar prosthesis trajectory line 13 and the centerline of the prosthesis is the trochlear groove offset distance, and the angle between the patellar prosthesis trajectory line 13 and the centerline of the prosthesis is the trochlear groove eversion angle. The femoral condyle prosthesis has a rotation center 15, and the femoral condyle prosthesis has a first reference line 16 and a second reference line 17 connecting the rotation center 15. The angle between the first reference line 16 and the second reference line 17 is α. The first reference line 16 is perpendicular to the long axis of the femur. The second reference line 17 is located above the starting point of the lowest point of the trochlear groove near the intercondylar fossa. The trochlear groove offset distance at the position of the second reference line 17 is positively correlated with the trochlear groove eversion angle.
[0044] The femoral condyle prosthesis of this invention, by positively correlated between the trochlear groove offset distance at the second reference line 17 position and the trochlear groove eversion angle, allows the offset distance of the lowest point above the trochlear groove to better restore the normal human body state under a reasonable trochlear groove eversion angle setting, thereby improving patellar comfort during trochlear movement and reducing the occurrence of anterior knee pain. The starting point of the trochlear groove is at the bottom. In this patent, the starting point below the trochlear groove is offset outwards, and the setting of the trochlear groove eversion angle from bottom to top mainly controls the upper offset. Therefore, the relationship between the trochlear groove eversion angle and the upper offset is established to demonstrate how to reasonably set the trochlear groove eversion angle to achieve the upper offset.
[0045] When α is 30°, the offset distance of the pulley groove is related to the outward turning angle of the pulley groove according to the formula y1=k1x1+b1; where x1 is the outward turning angle of the pulley groove, y1 is the offset of the pulley groove, and k1 and b1 are constants, with k1 ranging from 0.1 to 0.15 and b1 ranging from -9mm to 7mm.
[0046] The femoral condyle prosthesis of this invention uses x1 as the trochlear groove eversion angle, y1 as the trochlear groove offset, and k1 and b1 as constants, where k1 is 0.1 to 0.15 and b1 is -9 mm to 7 mm. This further reduces patellofemoral ligament tension and patellofemoral contact stress, thereby further avoiding anterior knee pain during large flexion movements.
[0047] The femoral condyle prosthesis of this invention has k1 ranging from 0.11 to 0.13 and b1 ranging from -8.6 mm to 6.56 mm. This further reduces patellofemoral ligament tension and patellofemoral contact stress, thereby further avoiding anterior knee pain during large flexion movements.
[0048] The trochlear groove offset y1 ranges from -3.1mm to 6.1mm. This further reduces patellofemoral ligament tension and patellofemoral contact stress, thereby further avoiding anterior knee pain during large flexion movements. In this embodiment, the trochlear groove eversion angle can be positive, in which case the trochlear groove is everted; or, the trochlear groove eversion angle can also be negative, in which case the trochlear groove is inverted.
[0049] like Figure 3and Figure 4 As shown, the femoral condyle prosthesis also has a third reference line 18 connecting the rotation center 15 and the prosthesis patella trajectory line 13. The angle between the third reference line 18 and the first reference line 16 is β. The trochlear groove offset distance at the position of the second reference line 17 is positively correlated with the trochlear groove offset distance at the position of the third reference line 18.
[0050] The femoral condyle prosthesis of this invention also has a third reference line 18 connecting the rotation center 15 and the patellar trajectory line 13. The angle between the third reference line 18 and the first reference line 16 is β. The trochlear groove offset distance at the second reference line 17 position is positively correlated with the trochlear groove offset distance at the third reference line 18 position, which better defines the relationship between the offset distances at the two positions, so that the offset distances at different positions can be better restored to the normal human body state, thereby improving the patellar comfort during trochlear movement and reducing the occurrence of anterior knee pain.
[0051] like Figure 3 and Figure 4 As shown, when α is 30° and β is 50°, the offset distance of the trochlear groove at the second reference line 17 and the offset distance of the trochlear groove at the third reference line 18 conform to y2=k2y1+b2; where y2 is the offset distance of the trochlear groove at the third reference line 18, and y1 is the offset distance of the trochlear groove at the second reference line 17; k2 and b2 are constants, with k2 ranging from 0.65mm to 0.85mm and b2 ranging from -4.5mm to 9mm.
[0052] Optionally, k2 can be from 0.68mm to 0.83mm, and b2 can be from -4.3mm to 8.7mm;
[0053] Optionally, y2 can be from 0.1mm to 6.5mm.
[0054] Alternatively, y1 can be from -3.1mm to 6.1mm.
[0055] like Figure 3 and Figure 4 As shown, when α is 30° and β is 70°, the offset distance of the trochlear groove at the second reference line 17 and the offset distance of the trochlear groove at the third reference line 18 conform to y2=k2y1+b2; where y2 is the offset distance of the trochlear groove at the third reference line 18, and y1 is the offset distance of the trochlear groove at the second reference line 17; k2 and b2 are constants, with k2 ranging from 0.3mm to 0.6mm and b2 ranging from -4mm to 8mm.
[0056] k2 ranges from 0.32 mm to 0.57 mm, and b2 ranges from -3.5 mm to 7.7 mm.
[0057] Optionally, y2 is 0.1 mm to 6.1 mm.
[0058] Optionally, y1 is -3.1mm to 6.1mm.
[0059] The outward angle of the pulley trench ranges from -5° to 15°. This allows for a better definition of the relationship between the offset distances between the two locations.
[0060] A better definition of the relationship between the offset distances of two positions allows the offset distances of different positions to be better restored to the normal human body state, thereby improving the comfort of the patella during trochlear movement and reducing the occurrence of anterior knee pain.
[0061] In this embodiment, the trajectory line of the trolley groove between the first reference line position, the second reference line position, and the third reference line position can be a straight line or a smoothly transitioning curve. When it is a straight line, the trajectory line of the trolley groove is a linear trajectory; when it is a curve, the trajectory line of the trolley groove is a non-linear trajectory.
[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.
[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0066] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0067] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A femoral condyle prosthesis, characterized in that, include: The femoral condyle includes a medial condyle and a lateral condyle for corresponding engagement with the tibia. The medial and lateral condyles are connected to each other to form an anterior condylar surface. The anterior condylar surface has a central depression that forms a trochlear groove for receiving the patella. The line connecting the lowest points of the trochlear groove is the trajectory line of the prosthesis patella. The prosthesis patella trajectory line is located lateral to the midpoint of the intercondylar fossa at the lowest point of the trochlear groove of the femoral condyle. The distance between the patellar prosthesis trajectory line and the center line of the prosthesis is the trochlear groove offset distance, and the angle between the patellar prosthesis trajectory line and the center line of the prosthesis is the trochlear groove eversion angle; The femoral condyle prosthesis has a center of rotation and a first reference line and a second reference line connecting the center of rotation. The angle between the first reference line and the second reference line is α. The first reference line is perpendicular to the long axis of the femur. The second reference line is located above the starting point of the lowest point of the trochlear groove near the intercondylar fossa. The offset distance at the position of the second reference line is positively correlated with the angle of eversion of the trochlear groove.
2. The femoral condyle prosthesis according to claim 1, characterized in that, When α is 30°, the offset distance of the trolley groove is related to the outward turning angle of the trolley groove as y1=k1x1+b1; where x1 is the outward turning angle of the trolley groove, y1 is the offset of the trolley groove, k1 and b1 are constants, k1 is 0.1 to 0.15, and b1 is -9mm to 7mm.
3. The femoral condyle prosthesis according to claim 2, characterized in that, The value of k1 is 0.11 to 0.13, and the value of b1 is -8.6 mm to 6.56 mm. And / or, the offset y1 of the trolley groove is from -3.1 mm to 6.1 mm.
4. The femoral condyle prosthesis according to claim 1, characterized in that, The femoral condyle prosthesis also has a third reference line connecting the rotation center and the patellar trajectory line of the prosthesis. The third reference line is located above the starting point of the lowest point of the trochlear groove near the intercondylar fossa. The second reference line is located between the first reference line and the third reference line. The angle between the third reference line and the first reference line is β. The trochlear groove offset distance at the position of the second reference line is positively correlated with the trochlear groove offset distance at the position of the third reference line.
5. The femoral condyle prosthesis according to claim 4, characterized in that, When α is 30° and β is 50°, the offset distance of the trolley groove at the second reference line position and the offset distance of the trolley groove at the third reference line position conform to y2=k2y1+b2; where y2 is the offset distance of the trolley groove at the third reference line position, and y1 is the offset distance of the trolley groove at the second reference line position; k2 and b2 are constants, k2 is 0.65mm to 0.85mm, and b2 is -4.5mm to 9mm.
6. The femoral condyle prosthesis according to claim 5, characterized in that, The value of k2 is 0.68 mm to 0.83 mm, and the value of b2 is -4.3 mm to 8.7 mm. And / or, the y2 is from 0.1 mm to 6.5 mm; And / or, the y1 is -3.1 mm to 6.1 mm.
7. The femoral condyle prosthesis according to claim 5, characterized in that, When the femoral condyle prosthesis is used in a female patient, y2 is -0.6 mm to 6.5 mm; when the femoral condyle prosthesis is used in a male patient, y2 is -2.5 mm to 6.5 mm.
8. The femoral condyle prosthesis according to claim 4, characterized in that, When α is 30° and β is 70°, the offset distance of the trolley groove at the second reference line position and the offset distance of the trolley groove at the third reference line position conform to y2=k2y1+b2; where y2 is the offset distance of the trolley groove at the third reference line position, and y1 is the offset distance of the trolley groove at the second reference line position; k2 and b2 are constants, k2 is 0.3mm to 0.6mm, and b2 is -4mm to 8mm.
9. The femoral condyle prosthesis according to claim 8, characterized in that, The value of k2 is 0.32 mm to 0.57 mm, and the value of b2 is -3.5 mm to 7.7 mm. And / or, the y2 is 0.1 mm to 6.1 mm; And / or, the y1 is -3.1 mm to 6.1 mm.
10. The femoral condyle prosthesis according to any one of claims 1-9, characterized in that, The outward turning angle of the pulley groove is -5° to 15°.
11. A femoral prosthesis, characterized in that, include: The femur and the femoral condyle prosthesis according to any one of claims 1-10, wherein the femoral condyle prosthesis is disposed at the distal end of the femur.