Bionic acetabular prosthesis

Abstract

A bionic acetabular prosthesis comprises a generally spherical crown-shaped cup (10), wherein the bottom of the cup (10) is recessed inwardly to form a cavity (11), a plurality of generally ring-shaped ridges (12) are provided on an outer wall surface of the cup (10), each of the ridges (12) has a cross section that is generally in the shape of a trapezoid having a wider base and a narrower top, notches (13) are provided on the ridge (12) at intervals in a circumferential direction of the ridge (12), and the recessed depth of each of the notches (13) is less than or equal to the raised height of the ridge (12). The slope of two inclined sides of the generally trapezoidal cross section of the ridge (12) on the cup (10) is adjusted according to the material of which the cup is manufactured, thereby preventing the formation of flaws on a surface of the cavity (11), and ensuring the production quality of the acetabular prosthesis. The notches (13) are arbitrarily arranged on the ridge (12) as desired, so as to facilitate cooperation with bone cement to limit the circumferential rotation of the cup (10). A wide-opening annular groove (16) is formed by inclined surfaces of two adjacent ridges (12) which are smoothly connected, and the annular groove can accommodate more bone cement during use, thereby improving the stability of the cup (10) in a height direction of the cup (10) in a mounted state.

Description

Bionic acetabular prosthesis Technical Field

[0001] This invention belongs to the field of joint prosthesis technology, and specifically relates to a bionic acetabular prosthesis. Background Technology

[0002] Total hip replacement surgery is a treatment method that uses acetabular prostheses and femoral prostheses to replace diseased hip joints. The acetabular prosthesis fixation method, which is connected to the acetabulum by the bonding effect of bone cement, has been widely used due to its advantage of rapid postoperative recovery.

[0003] Chinese patent CN209253232U (referred to as Document 1) discloses a cemented acetabular prosthesis, including a cup body with a hemispherical structure and an internal receiving cavity. Horizontal and vertical grooves are formed on the outer surface of the cup body, and a retaining ring engages with the horizontal groove. Multiple horizontal grooves are arranged parallel to each other, and the vertical grooves are symmetrically formed on the vertical plane of the cup body. One end of each vertical groove converges on a horizontal groove at the top of the cup body. Each vertical plane containing two symmetrically arranged vertical grooves divides the cup body into two parts of equal area. After the patient's acetabular fossa is filled with bone cement, the cemented acetabular prosthesis is implanted into the acetabular fossa. The horizontal grooves of the acetabular prosthesis prevent axial movement, and the vertical grooves prevent rotation within the acetabular fossa. The retaining ring is made of metal, which is visible on X-rays, helping doctors determine the implanted position of the cemented acetabular prosthesis. Another Chinese patent, CN213250057U (referred to as Document 2), discloses an acetabular cup with a radiopaque wire, comprising an acetabular cup body integrally molded from ultra-high molecular weight polyethylene material. The acetabular cup body includes a hemispherical body at the lower part and a constricting part at the upper part of the hemispherical body. The diameter of the constricting part is smaller than the diameter of the hemispherical body to limit the dislocation of the femoral head from the ball joint. Multiple parallel annular grooves are evenly opened on the outer side of the hemispherical body from the pole to the equator, as well as a vertical groove connecting the pole and the equator. Among them, a radiopaque wire made of metal is disposed in the annular groove with the largest diameter.

[0004] As shown in the accompanying drawings of references 1 and 2, the outer surface of the prior art hemispherical acetabular prosthesis is divided into several protrusions by transverse and vertical grooves. The size of the protrusions is significantly larger than the opening size of the vertical or transverse grooves. This makes it difficult for bone cement to enter the groove cavity, which cannot guarantee the stability of the acetabular prosthesis installation. On the other hand, it makes the wall thickness of the acetabular prosthesis at the transverse or vertical grooves vary greatly. In order to avoid the inner surface shrinkage and deformation during the molding of the acetabular prosthesis, resulting in an uneven inner surface of the acetabular prosthesis, the acetabular prosthesis needs to use a larger wall thickness. Thus, with the same outer diameter acetabular prosthesis, the range of motion of the hip joint is less than that of the acetabular prosthesis with a thinner wall thickness.

[0005] Summary of the Invention

[0006] The purpose of this invention is to provide a bionic acetabular prosthesis that is easy to manufacture and has good installation stability.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a biomimetic acetabular prosthesis, comprising a cup body that is generally spherical in shape, the bottom of the cup body being concave inward to form a cavity, the inner wall surface of the cavity including a spherical crown surface that matches the outer diameter of the spherical prosthesis, the outer wall surface of the cup body being provided with a plurality of annular protrusions, the cross-section of the protrusions being generally trapezoidal in shape with a larger base and a smaller top, the base connection of adjacent protrusions forming an annular groove, and the protrusions being provided with circumferentially spaced recesses, the recess depth of which is less than or equal to the protrusion height of the protrusion.

[0008] Compared with existing technologies, this invention offers the following technical advantages: By adjusting the slope of the two sides of the trapezoidal cross-section of the convex ridge on the cup body according to the material used in its manufacture, defects on the spherical surface can be avoided, thus ensuring the production quality of the acetabular prosthesis. Furthermore, recesses can be arbitrarily arranged on the convex ridge as needed to facilitate circumferential rotational restraint of the cup body with the bone cement. The gently sloping surfaces of two adjacent convex ridges form a large-opening annular groove, which can accommodate more bone cement during use, thereby improving the stability of the cup body in the height direction during installation. Attached Figure Description

[0009] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings within them:

[0010] Figures 1 and 2 are three-dimensional schematic diagrams of Embodiment 1;

[0011] Figure 3 is a top view of Embodiment 1;

[0012] Figure 4 is a sectional view of BB in Figure 3;

[0013] Figure 5 is a cross-sectional view of AA in Figure 3;

[0014] Figure 6 is a three-dimensional schematic diagram of Embodiment 2;

[0015] Figure 7 is a front view of Embodiment 2;

[0016] Figure 8 is a CC sectional view of Figure 7;

[0017] Figure 9 is a cross-sectional view of Embodiment 2, passing through the center line and avoiding the concave notch.

[0018] In the diagram: 10. Cup body, 11. Cavity, 111. Spherical cap surface, 112. Conical surface, 12. Convex ridge, 121. Frustum surface, 122. Upper side ridge surface, 122a. Convex ridge plane region, 13. Notch, 14. Positioning boss, 141. Table surface, 15. Convex ring, 151. Outer ring surface of the convex ring, 152. Upper side ring surface, 152a. Convex ring plane region, 16. Annular groove, 20. Developing wire. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0020] Example 1

[0021] A biomimetic acetabular prosthesis includes a cup 10 that is shaped like a spherical crown. The bottom of the cup 10 is recessed inward to form a cavity 11. The inner wall of the cavity 11 includes a spherical crown surface 111 for relative rotational engagement with a ball head prosthesis. To ensure a stable and reliable engagement between the two, the inner wall of the spherical crown surface 111 should be smooth, and its diameter should match the outer diameter of the ball head prosthesis.

[0022] To ensure stable installation of the acetabular prosthesis, the outer wall of the cup body 10 is provided with several integrally annular protrusions 12. During use, after the bone cement solidifies in the annular groove 16, it prevents the cup body 10 from shifting along the direction of the cup body centerline a. As shown in Figure 1, the term "annular" refers to the fact that the protrusions 12 are arranged in a closed ring on the outer wall of the cup body 10, and their protrusions are continuous and uninterrupted. This further ensures the stability and reliability of the cup body 10 and the bone cement in the upper limit direction of the cup body centerline a. As shown in Figure 4, the cross-section of the protrusion 12 perpendicular to its annular core is integrally trapezoidal in shape, with a larger base and a smaller top. The wall thickness of the cup body 10 gradually increases from both sides of the protrusions 12 towards the middle, which effectively avoids quality defects on the inner wall surface of the cavity 11 caused by excessive wall thickness variation. The connection between two adjacent protrusions 12 is the base of the protrusion with a smaller protrusion height, which forms the annular groove 16 under the support of the top of the protrusion with a larger protrusion height.

[0023] As shown in Figure 3, the convex ridge 12 is circumferentially spaced with recesses 13. During use, after the bone cement solidifies within the concave cavity of the recess 13, it prevents the cup body 10 from rotating around its centerline a. In this embodiment, the depth of the recess 13 is less than or equal to the height of the convex ridge 12. That is, the minimum distance between the concave surface of the recess 13 and the center of the spherical cap 111 is greater than the minimum distance between the convex surface of the convex ridge 12 and the center of the spherical cap 111. This ensures that although the convex portions of the convex ridge 12 are arranged at varying heights, they remain continuous. Furthermore, provided that the convex ridge 12 does not cause quality defects on the inner wall of the cavity 11, the recesses 13 are located far from the inner wall of the cavity 11, and the change in wall thickness of the cup body 10 at this location is less than the change in wall thickness of the convex ridge 12. Therefore, they also do not cause quality defects on the inner wall of the cavity 11. In other words, during the product design phase, the shape and contour of the protrusion 12 are adjusted according to the selected material design so that the surface quality of the spherical crown 111 meets the requirements, and then the arrangement of the recess 13 has a greater degree of freedom.

[0024] The maximum concavity of the concave surface of the notch 13 in the radial direction of the cup body 10 is defined as the depth, and the maximum distance between the two ends of the concave surface in the circumferential direction of the cup body 10 is defined as the width. The greater the depth and width of the notch 13, the better its effect on restricting the rotation of the cup body 10 in conjunction with the bone cement, and the more convenient the adjustment of the alignment with the acetabular foramen. However, if the depth or width of the notch 13 located at the lower part of the cup body 10 is too large, it can easily cause bone cement to leak out from the cup opening of the cup body 10. The diameter of the annular core of the convex ridge 12 located at the upper part of the cup body 10 is small, and if the depth or width of the notch 13 set on it is too large, the effective length of the ridge will be small, thus failing to guarantee the axial anti-dislocation effect. Therefore, as shown in Figure 5, in this embodiment, the depth of the recess 13 arranged in the middle along the height direction of the cup body 10 is greater than the depth of the recess 13 located above or below it, that is, h2>h1 and h2>h3 in the figure. Simultaneously, in this embodiment, the width of the recess 13 arranged in the middle along the height direction of the cup body 10 is also greater than the width of the recess 13 located above or below it. In other embodiments, the recess 12 can also be configured such that only the depth or width of the recess is larger in the middle and smaller at the top and bottom, depending on the requirements.

[0025] Furthermore, the concave surfaces of the recesses 13 located on the same side of the cup body 10 and arranged at different heights can be located within the same cylindrical surface, making the positioning of machining tools or molds more convenient. Based on this, to ensure that the depth of the recesses 13 is less than the protrusion height of the convex ridge 12, as shown in Figure 5, the recesses 13 are arranged symmetrically with respect to the center line a of the cup body. The center lines c and d of the concave surfaces of the recesses 13 arranged on both sides of the center line a intersect at point P, which is located above the cup body 10. Thus, by determining the positional relationship between the center lines c and d of the concave surfaces and the center line a of the cup body, the depth of the recesses 13 can be determined. As shown in Figure 3, in this embodiment, four sets of recesses 13 arranged at different heights are spaced at equal angles around the circumference of the cup body 10, and the center lines of the concave surfaces of each recess 13 intersect at a single point, facilitating the positioning of machining tools or molds for the recesses 13.

[0026] As shown in Figure 4, the protruding ridge 12 includes a frustum surface 121 arranged away from the cavity 11. The frustum surface 121 forms the protruding top surface of the protruding ridge 12. The frustum surfaces 121 of each protruding ridge 12 on the cup body 10 are located within the same spherical surface. The top of the cup body 10 is provided with an upwardly protruding positioning boss 14. The platform surface 141 of the positioning boss 14 and the frustum surface 121 of the protruding ridge 12 are located within the same spherical surface. The positioning boss 14 is mushroom-shaped, smaller at the bottom and larger at the top, and its inwardly recessed base also forms an annular groove 16. The bottom outer periphery of the cup body 10 is provided with a convex ring 15. The upper ring surface 151a of the outer ring surface 151 and the frustum surface 121 are located on the same spherical surface. The bottom of the upper ring surface 151a extends downward along the tangential direction of the spherical surface to form a cylindrical lower ring surface 151b. The curvature center O of the spherical surface where the upper ring surface 151a is located intersects with the core line of the lower ring surface 151b.

[0027] As shown in Figure 4, most of the outer surface of the cup body 10, except for the cup mouth end, is within the same spherical surface, which facilitates the adjustment of the installation posture of the cup body 10. The positioning boss 14 can ensure the accuracy of the installation positioning of the cup body 10 in the direction of the cup body centerline a, that is, ensure the accuracy of the installation depth positioning of the cup body 10 in the acetabular fossa.

[0028] The upper edge 122 of the convex ridge 12 includes an annular planar convex ridge plane region 122a, and the surfaces of each convex ridge plane region 122a are parallel. This facilitates the removal of the cutting tool or mold along a direction parallel to the convex ridge plane region 122a during production. In this embodiment, the surface of the annular core of the convex ridge 12 is perpendicular to the center line a of the cup body, and the surface of the convex ridge plane region 122a is also perpendicular to the center line a of the cup body. Similarly, for ease of production, as shown in Figures 2 and 4, the surface of the ring core of the convex ring 15 is perpendicular to the center line a of the cup body, and the upper edge 152 of the convex ring 15 includes an annular planar convex ring plane region 152a, which is also perpendicular to the center line a of the cup body. The cup mouth end face of the cup body 10 is also a plane perpendicular to the central axis a of the cup body, so that the cutting tool or mold used to produce the cup body 10 can be separated along a direction perpendicular to the center line a of the cup body.

[0029] To ensure the appearance quality of the cup body 10, in this embodiment, the angle between the outer edge of the convex ridge plane region 122a and the frustum surface 121 is an obtuse angle, which is less likely to cause appearance quality problems such as burrs. Therefore, the outer edge of the convex ridge plane region 122a directly connects to the frustum surface 121. In other embodiments, the connection between the outer edge of the convex ridge plane region 122a and the frustum surface 121 can also be chamfered. The inner edge of the convex ridge plane region 122a forms an acute angle with the surface of the convex ridge 12 or positioning boss 14 located above it. To ensure the appearance quality of the cup body 10, the inner edge of the convex ridge plane region 122a is connected to the convex ridge 12 or positioning boss 14 located above it through a concave smooth curved surface. Similarly, in this embodiment, the angle between the outer edge of the convex ring planar region 152a and the outer ring surface 151 of the convex ring is close to a right angle. To ensure the appearance quality at this point, the outer edge of the convex ring planar region 152a is chamfered or rounded before connecting with the outer ring surface 151. In other embodiments, the outer edge of the convex ring planar region 152a can also directly connect with the outer ring surface 151. The interface between the convex ring planar region 152a and the convex ridge 12 located above it forms an acute angle. To ensure the appearance quality of the cup body 10, the inner edge of the convex ring planar region 152a is connected to the convex ridge 12 located above it through a concave smooth curved surface.

[0030] In this embodiment, the cup body 10 is made of polyetheretherketone (PEEK). Compared with common polyethylene, PEEK has higher strength, thus allowing for a further reduction in the wall thickness of the cup body 10. To reliably maintain the shape of the cup body 10 and ensure the stability of the spherical cap surface 111 inside the cup body 10, the larger the size of the cup body 10, the greater its wall thickness needs to be. In a preferred embodiment, the wall thickness of the cup body 10 with an outer diameter less than 17 mm ranges from 1 mm to 2 mm; the wall thickness of the cup body 10 with an outer diameter greater than or equal to 17 mm and less than or equal to 25 mm ranges from 1.5 mm to 3.5 mm; and the wall thickness of the cup body 10 with an outer diameter greater than 25 mm ranges from 2 mm to 5 mm. The outer diameter mentioned here refers to the size and model of the outer periphery of the cup body 10. In this embodiment, the outer diameter of the cup body 10 refers to the diameter of the spherical surface where the convex rhombus surface 121 is located. To ensure the effectiveness of the convex ridge 12 in fitting and limiting the bone cement, the protrusion height of the convex ridge 12 must be greater than or equal to 0.5 mm. At the same time, in order to obtain a thin-walled cup body 10 to enhance the anti-dislocation performance of the acetabular prosthesis, the protrusion height of the convex ridge 12 should be less than half the wall thickness of the cup body 10.

[0031] In the prior art, acetabular prostheses with an outer diameter of less than 17 mm typically have a wall thickness of at least 3 mm. In this embodiment, the maximum wall thickness of the cup body 10 is 2 mm. When performing hip replacement surgery using acetabular prostheses with the same outer diameter, the outer diameter of the ball head prosthesis that mates with this embodiment is at least 1 mm larger than the outer diameter of the ball head prosthesis accommodated in the acetabular prosthesis in the prior art. As a result, the displacement required for the ball head prosthesis to dislodge from this embodiment is at least 1 mm greater than that in the prior art, significantly reducing the risk of dislocation of the ball head prosthesis and enhancing the range of motion of the hip joint.

[0032] To ensure the surface quality of the spherical cap surface 111 meets requirements even with a small wall thickness, the preferred embodiment defines the shape and profile of the convex ridges 12 as follows: the included angle α at the base of the highest convex ridge 12 is 3-7 times the included angle β at the top of the convex ridge, and the included angle α at the base of the other convex ridges 12 is 3-5 times the included angle β at the top of the convex ridge. That is, in Figures 4 and 9, ∠α1 is 3-7 times ∠β1, and ∠α2 is 3-5 times ∠β2.

[0033] As shown in Figure 4, the included angle α at the base of the convex ridge is the central angle corresponding to the arc range of the base of the convex ridge, and the included angle β at the top of the convex ridge is the central angle corresponding to the arc range of the top of the convex ridge. In addition, as shown in Figure 4, the positioning boss 14 protrudes upward from the middle of the upper side face 122 of the convex ridge 12 in the highest position. The convex plane region 122a of the upper side face 122 of the convex ridge 12 in the highest position is connected to the base of the positioning boss 14 arranged in the center. The difference between the inner and outer diameters of the convex plane region 122a is significantly greater than that of other convex plane regions 122a. Therefore, the included angle at the base of the convex ridge 12 in the highest position is also greater than that of other convex ridges 12.

[0034] Furthermore, the more protruding ribs 12 there are, the more annular grooves 16 there are, which provides better assurance for the cup body 10 in the direction of the cup body centerline a. Therefore, the included angle β at the top of the protruding ribs is 3°-9°, so that at least two protruding ribs 12 are provided on the outer surface of the cup body 10, thereby forming at least two annular grooves 16.

[0035] As shown in Figures 4 and 5, the spherical cap surface 111 is positioned high within the cavity 11, and the inner wall of the cavity 11 also includes a low-positioned conical surface 112. The spherical cap surface 111 and the conical surface 112 are connected by a smooth curved transition. The height of the spherical cap surface 111 is less than its radius, meaning its center point O is located within the containment cavity of the conical surface 112. Thus, during use, the center of the prosthesis is located within the cavity 11 of the cup body 10. This means the displacement required for the prosthesis to dislodge from the cup body 10 is greater than the radius of the prosthesis, reducing the risk of dislocation. Since the prosthesis is connected to the femoral stem via the neck, the opening of the cup body 10 may interfere with the neck. A raised ring 15 is provided at the opening of the cup body 10, giving it a greater thickness. A conical portion 112 is then provided on the inner wall at this location, allowing the opening of the cavity 11 to avoid the neck, thereby further increasing the mobility of the prosthesis.

[0036] As shown in Figures 1 and 3, a metal developing wire 20 can be embedded in the annular groove 16 during use, facilitating the determination of the installation posture of the cup body 10 during medical testing. In this embodiment, as shown in Figure 3, the developing wire 20 is an open ring, and its overall shape is C-shaped.

[0037] Example 2

[0038] The difference between this embodiment and Embodiment 1 is that the upper edge of the convex ring 15 is provided with recesses 13 spaced circumferentially. To prevent bone cement from overflowing from the outer periphery of the cup body 10, in this embodiment, the bottom of the recesses 13 is connected to the upper ring surface 151a, that is, the recesses 13 are located above the lower section 151b of the outer ring surface. For ease of processing, in this embodiment, the recesses 13 on the convex ring 15 and the recesses 13 on the convex ridge 12 are located within the same cylindrical surface.

Claims

1. A biomimetic acetabular prosthesis, comprising a cup (10) that is generally spherical in shape, the bottom of the cup (10) being concave inward to form a cavity (11), the inner wall of the cavity (11) including a spherical crown surface (111) that matches the outer diameter of the acetabular prosthesis, characterized in that: The outer wall of the cup body (10) is provided with several integrally ring-shaped protrusions (12). The cross section of the protrusions (12) is integrally trapezoidal with a large base and a small top. The base connection of adjacent protrusions (12) forms an annular groove (16). The protrusions (12) are provided with recesses (13) circumferentially spaced around them. The recess depth of the recesses (13) is less than or equal to the protrusion height of the protrusions (12).

2. The bionic acetabular prosthesis according to claim 1, characterized in that: The frustum face (121) of the convex edge (12) that is far from the cavity (11) is located in the same sphere; The top of the cup body (10) is provided with an upwardly protruding positioning boss (14). The positioning boss (14) is mushroom-shaped with a smaller bottom and a larger top. The platform (141) of the positioning boss (14) and the frustum (121) of the protrusion (12) are located in the same spherical surface. The bottom outer periphery of the cup body (10) is provided with a convex ring (15). The upper ring surface (151a) of the outer ring surface (151) of the convex ring and the frustum surface (121) are located on the same spherical surface. The bottom of the upper ring surface (151a) extends downward along the tangential direction of the spherical surface to form a cylindrical lower ring surface (151b).

3. The bionic acetabular prosthesis according to claim 2, characterized in that: The upper edge surface (122) of the convex edge (12) includes an annular planar convex edge plane domain (122a), and the planes containing each convex edge plane domain (122a) are parallel. The outer edge of the convex ridge plane domain (122a) is directly connected to the frustum surface (121) or after being chamfered / rounded, it is connected to the frustum surface (121). The inner edge of the convex ridge plane domain (122a) is connected to the convex ridge (12) or positioning boss (14) located above it through a concave smooth curved surface. The plane containing the ring core of the convex ridge (12) is perpendicular to the center line (a) of the cup body, and the plane region of the convex ridge (122a) The plane in question is perpendicular to the center line of the cup (a).

4. The bionic acetabular prosthesis according to claim 2, characterized in that: The included angle α at the base of the highest convex ridge (12) is 3-7 times the included angle β at the top of the convex ridge. The included angle α at the base of the other convex ridges (12) is 3-5 times the included angle β at the top of the convex ridge. The included angle α at the base of the convex ridge is defined as the central angle corresponding to the arc range of the base of the convex ridge, and the included angle β at the top of the convex ridge is defined as the central angle corresponding to the arc range of the top of the convex ridge. The included angle β at the top of the convex ridge is 3°-9°.

5. The bionic acetabular prosthesis according to claim 2, characterized in that: The upper edge of the convex ring (15) is provided with recesses (13) at intervals around its circumference, and the bottom of the recesses (13) is connected to the upper ring surface (151a).

6. The bionic acetabular prosthesis according to claim 2, characterized in that: The core of the convex ring (15) is perpendicular to the center line (a) of the cup body. The upper ring surface (152) of the convex ring (15) includes a ring-shaped planar convex ring area (152a). The convex ring area (152a) is perpendicular to the center line (a) of the cup body. The outer edge of the convex ring area (152a) is directly connected to the outer ring surface (151) of the convex ring or after being chamfered / rounded. The inner edge of the convex ring area (152a) is connected to the convex ridge (12) above it through a concave smooth curved surface.

7. The bionic acetabular prosthesis according to any one of claims 1-6, characterized in that: The depth of the recess (13) arranged in the middle of the height direction of the cup body (10) is greater than the depth of the recess (13) located above or below it, and / or the width of the recess (13) arranged in the middle of the height direction of the cup body (10) is greater than the width of the recess (13) located above or below it.

8. The bionic acetabular prosthesis according to claim 7, characterized in that: The concave surfaces of the recesses (13) located on the same side of the cup body (10) and arranged at different heights are located within the same cylindrical surface.

9. The bionic acetabular prosthesis according to claim 8, characterized in that: The notches (13) are arranged symmetrically with respect to the center line of the cup body (10). The center lines (c, d) of the concave surfaces of the notches (13) arranged on both sides of the center line (a) of the cup body intersect above the cup body (10).

10. The bionic acetabular prosthesis according to claim 1, characterized in that: The cup mouth end face of the cup body (10) is a plane perpendicular to the central axis (a) of the cup body. The spherical crown surface (111) is arranged at a high position inside the cavity (11). The inner wall of the cavity (11) also includes a cone surface (112) arranged at a low position. The spherical crown surface (111) and the cone surface (112) are connected by a smooth curved surface transition. The height of the spherical crown surface (111) is less than its radius. The developing wire (20) made of metal is embedded in the annular groove (16). The developing wire (20) is C-shaped as a whole.

11. The bionic acetabular prosthesis according to claim 1, characterized in that: The cup body (10) is made of polyetheretherketone material. The wall thickness of the cup body (10) with an outer diameter of less than 17 mm is 1 mm-2 mm, the wall thickness of the cup body (10) with an outer diameter of greater than or equal to 17 mm and less than or equal to 25 mm is 1.5 mm-3.5 mm, and the wall thickness of the cup body (10) with an outer diameter of greater than 25 mm is 2-5 mm. The protrusion height of the ridge (12) is greater than or equal to 0.5 mm and less than half the wall thickness of the cup body (10).

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