A hip joint prosthesis

Abstract

The application relates to a hip joint prosthesis, which comprises an interposition acetabulum prosthesis and a femoral head reconstruction device. The interposition acetabulum prosthesis is connected with the acetabular fossa of the pelvis stably through an interposition acetabulum cup, a fixing screw and an interposition acetabulum liner, and the adaptability and stability are enhanced through multiple designs such as petal opening and damping parts; the femoral head reconstruction device comprises a joint friction surface prosthesis and a bone ingrowth support cage, and the reconstruction and stable support of the femoral head are realized. The application achieves the technical effects of improving the stability and durability of the hip joint prosthesis, reducing the postoperative discomfort of patients and promoting the growth of bone tissue.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a hip joint prosthesis. Background Technology

[0002] Hip replacement surgery, a crucial technique in modern orthopedics, is widely used to relieve joint pain and restore joint function. With continuous technological advancements, the design and materials of hip prostheses are constantly being optimized, significantly improving patients' quality of life. However, despite its great success, hip replacement surgery still faces numerous challenges in clinical application, particularly regarding prosthesis lifespan, postoperative complications, and suitability for younger patients. These issues prompt researchers to continuously explore safer and more effective hip reconstruction methods.

[0003] Currently, to address issues in hip replacement surgery, the industry commonly employs total hip arthroplasty or resurfacing hip replacement. Total hip replacement restores joint function by completely replacing the femoral head and acetabulum, while resurfacing hip replacement preserves the femoral head and replaces only the acetabular surface. Furthermore, some improvements include using highly wear-resistant materials, optimizing prosthesis design, and introducing bioactive coatings to enhance prosthesis durability and biocompatibility. These methods have improved the outcomes of hip replacement to some extent, but they still fail to completely resolve issues such as prosthesis loosening, infection, and femoral head necrosis.

[0004] In current technologies, both total hip arthroplasty and resurfacing hip arthroplasty inevitably damage the femoral head or acetabulum, leading to postoperative problems such as muscle weakness, ligament injury, and stress shielding of the femoral head. Especially for younger patients, these surgeries may require multiple revisions, increasing patient suffering and financial burden. Therefore, how to achieve effective hip joint reconstruction while preserving the femoral head and surrounding soft tissues has become a pressing technical challenge. Summary of the Invention

[0005] To overcome the above-mentioned technical problems, this application provides a hip joint prosthesis and a method for femoral head reconstruction.

[0006] The hip joint prosthesis provided in this application adopts the following technical solution:

[0007] A hip joint prosthesis, placed between the femoral head and the acetabulum of the pelvis, includes:

[0008] An interpositional acetabular prosthesis, positioned close to the acetabular fossa of the pelvis, includes an interpositional acetabular cup and an interpositional acetabular fixation screw that conform to the acetabular fossa of the pelvis, and an interpositional acetabular liner positioned on the side of the interpositional acetabular cup away from the acetabular fossa of the pelvis. The interpositional acetabular cup has an installation hole, through which the interpositional acetabular fixation screw passes and is fixedly connected to the acetabular fossa of the pelvis to fix the interpositional acetabular cup. A tapered mounting post is provided at the top of the interpositional acetabular liner, and an installation groove is provided on the top inner side of the interpositional acetabular cup for the mounting post to mate with. The mounting post mates with the installation groove to connect the interpositional acetabular liner to the interpositional acetabular cup.

[0009] A femoral head reconstruction device is disposed between the interpositional acetabular prosthesis and the femoral head and is slidably connected to the interpositional acetabular liner. It includes an articular friction surface prosthesis and a bone ingrowth support cage, the bone ingrowth support cage being inserted into the femoral head.

[0010] By employing the above-mentioned technical solution, the interpositional acetabular prosthesis can closely fit the acetabular fossa of the pelvis. The interpositional acetabular cup, through a pre-drilled mounting hole, engages with the interpositional acetabular fixation screw to achieve a stable connection. The interpositional acetabular fixation screw passes through the mounting hole and is deeply embedded within the acetabular fossa for fixation, ensuring that the interpositional acetabular cup will not shift. The interpositional acetabular liner is installed through a tapered mounting post at the top, which engages with a mounting groove on the inner top of the interpositional acetabular cup, further enhancing the structural stability. The femoral head reconstruction device is positioned between the interpositional acetabular prosthesis and the femoral head, with the articular friction surface prosthesis slidingly connected to the interpositional acetabular liner, ensuring flexibility of movement. The bone ingrowth support cage is inserted into the femoral head, providing strong support, reducing pressure on the femoral head, and promoting new bone growth. This design avoids the complete removal of the femoral head in traditional total hip arthroplasty, preserving the femoral head and surrounding soft tissues, and reducing the risk of postoperative muscle weakness and ligament injury. The interposition of the acetabular prosthesis and the femoral head reconstruction device work together to not only achieve effective reconstruction of the hip joint, but also preserve the integrity of the femoral head to the greatest extent, which helps maintain the stability and function of the hip joint, reduces the occurrence of postoperative complications, and improves the patient's quality of life.

[0011] Preferably, both the interpositional acetabular cup and the interpositional acetabular liner have an acetabular ligament protection zone, and an artificial ligament is provided in the ligament protection zone, which wraps around the acetabular ligament protection zone;

[0012] The artificial ligament's filaments are made of elastic cores with three different pitches;

[0013] The interpositional acetabular cup also has multiple petal openings, through which the interpositional acetabular cup achieves elliptical deformation.

[0014] By employing the above-mentioned technical solution, the artificial ligament wraps around the acetabular ligament protection zone, effectively protecting the ligament from impact by the metal acetabular cup and reducing patient discomfort. The artificial ligament sutures are made of elastic cores with three different pitches, allowing for free bending of more than 90 degrees, further improving the flexibility and adaptability of the ligament protection zone. In addition, the interpositional acetabular cup has multiple petal openings, enabling it to deform elliptically, thereby better conforming to the irregular elliptical structure within the acetabular fossa, enhancing the stability and fixation effect of the prosthesis.

[0015] Preferably, a shock absorber is further provided between the interpositional acetabular cup and the interpositional acetabular liner. The shock absorber includes a first guide post disposed on the inner surface of the interpositional acetabular cup, a second guide post disposed on the outer surface of the interpositional acetabular liner opposite to the first guide post, and a titanium alloy flexible spring disposed between the first guide post and the second guide post. The first guide post is a tube and is sleeved on the outside of the second guide post. The titanium alloy flexible spring is located inside the first guide post, with one end abutting against the inner side of the interpositional acetabular cup and the other end abutting against the end of the second guide post.

[0016] By adopting the above technical solution, the shock-absorbing component effectively buffers vibrations between the acetabular liner and the acetabular cup, protecting the hip joint structure from impact damage. Specifically, the coordinated design of the first and second guide posts ensures the relative motion stability between the acetabular liner and the acetabular cup, while the titanium alloy flexible spring converts vibration energy into physical stimulation of the acetabular fossa, promoting blood circulation and reducing the risk of osteonecrosis. Furthermore, this structure can adapt to the multi-directional force transmission requirements during hip joint movement, improving the overall stability and durability of the prosthesis.

[0017] Preferably, the side of the intercalary acetabular liner away from the intercalary acetabular cup is an inner spherical surface, and the roughness of the inner spherical surface is not greater than Ra0.5.

[0018] By adopting the above technical solution, the roughness of the inner spherical surface is no greater than Ra0.5, which can effectively reduce wear between the inner spherical surface and the femoral head reconstruction device, improve the durability of the hip joint prosthesis, and ensure the smoothness of hip joint movement, thereby reducing discomfort and potential damage caused by friction.

[0019] Preferably, the outer surface of the interpositional acetabular cup is provided with barbed posts, which are inserted into the acetabular fossa.

[0020] By adopting the above technical solution, the barbed column can penetrate deep into the acetabular fossa, significantly enhancing the fixation effect between the interpositional acetabular cup and the acetabular fossa, effectively preventing displacement or loosening of the interpositional acetabular cup during use, thereby ensuring the stability of the hip joint prosthesis and providing patients with more reliable support and a more comfortable user experience.

[0021] Preferably, three interpositional acetabular fixing screws are provided. Each interpositional acetabular fixing screw includes a drill bit section, a chip removal section connected to the drill bit section, a threaded section located at the other end of the chip removal section, and a pressure section located at the other end of the threaded section. The pressure section is conical. A spherical structure is provided at the other end of the pressure section. The spherical structure is located inside the interpositional acetabular cup. The remaining structures pass through the interpositional acetabular cup mounting hole and are fixed in the acetabular fossa.

[0022] By adopting the above technical solution, the drill section of the interpositional acetabular fixation screw can directly drill holes, reducing implantation steps. The chip removal section facilitates the removal of bone fragments generated during drilling, ensuring a smooth implantation process. The combined design of the threaded section and the tapered compression section not only improves the stability of screw implantation but also corrects the reverse stress released by the body, achieving secondary compression and effectively preventing screw loosening. The spherical structure allows the screw to rotate 360 ​​degrees inside the interpositional acetabular cup, enhancing the screw's adjustability and improving the overall structural adaptability and stability.

[0023] Preferably, the threaded section includes a fine threaded section connected to the chip removal section and a coarse threaded section connected to the fine threaded section.

[0024] By adopting the above technical solution, the fine thread segment has a shorter pitch, making it easier to enter the bone and providing good stability. The coarse thread segment has a longer pitch, allowing for stable entry at the front end and easier subsequent implantation. The use of both coarse and fine thread segments can prevent screw loosening after implantation.

[0025] Preferably, the joint friction surface prosthesis is made of ceramic material, and the joint friction surface prosthesis has a ligament crossing area corresponding to the acetabular ligament protection zone;

[0026] The bone ingrowth support cage includes a central fixing ring, and a femoral head support structure is circumferentially arranged on the central fixing ring. The femoral head support structure is inserted into the femoral head and is shaped like a sharp blade with a tantalum coating on its surface.

[0027] A second ligament protection zone is established between the femoral head support structures;

[0028] Multiple soft spring fixation posts are provided on the side of the central fixing ring away from the femoral head, and the soft spring fixation posts are connected to the joint friction surface prosthesis.

[0029] A central hole is formed at the middle position of the central fixing ring, the central hole is filled with bone and / or the artificial ligament is introduced through the central hole and fixed thereto;

[0030] A central fixing post is provided on the side of the central fixing ring close to the femoral head. The central fixing post is threaded on the outside and is fixed to the femoral head through the thread.

[0031] By employing the above technical solutions, the ceramic joint friction surface prosthesis provides excellent wear resistance, ensuring the stability and reliability of the hip joint during long-term use. A ligament crossing zone corresponding to the acetabular ligament protection zone effectively protects the ligament structure, reduces surgical damage to the ligaments, thereby reducing postoperative discomfort and promoting joint function recovery. The femoral head support structure, circumferentially positioned within the central fixation ring of the bone ingrowth support cage, is shaped like a sharp blade and coated with tantalum, enhancing fixation while promoting osteoblast attachment and proliferation, improving bone integration. A second ligament protection zone between the femoral head support structures further protects the ligaments, preventing additional damage during surgery. Multiple soft spring fixation posts on the central fixation ring connect to the joint friction surface prosthesis, continuously applying stress to stimulate bone regeneration, effectively avoiding osteonecrosis caused by stress shielding. The central hole design allows for bone filling or the introduction of artificial ligaments, enhancing the adaptability and functionality of the device. Threads are provided on the outer side of the central fixation post and it is fixed to the femoral head, ensuring the stability and long-term effectiveness of the device.

[0032] Preferably, the central fixing post is tapered, and the end of the central fixing post away from the central fixing ring is provided with a 3D printed trabecular structure, and the inner diameter of the thread is provided with a rough, porous shape.

[0033] By adopting the above technical solution, the conical shape of the central fixation post facilitates its insertion into the femoral head, reduces resistance during implantation, and improves fixation stability. The rough, porous morphology on the inner side of the central fixation post mimics the structural characteristics of natural trabecular bone, significantly promoting osteocyte attachment and proliferation, thereby achieving inward bone growth, enhancing long-term stability between the prosthesis and the femoral head, effectively preventing prosthesis loosening, and extending the prosthesis's lifespan. 3D-printed trabecular bone structure.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By preserving the femoral head ligament and setting up a protective zone for the acetabular ligament, combined with artificial ligament protection structures, ligament damage can be effectively reduced, hip joint stability can be maintained, and postoperative muscle weakness and atrophy can be avoided.

[0036] 2. The interposition of the acetabular prosthesis and the femoral head reconstruction device, with the use of bone ingrowth support cage and central fixation column design, promotes bone regeneration inside the femoral head, enhances bone strength, reduces stress shielding effect, and extends the service life of the prosthesis.

[0037] 3. The shock-absorbing component is designed to buffer the vibration between the acetabular liner and the acetabular cup, transmit the vibration force to the acetabular fossa, enhance physical stimulation, promote blood circulation, reduce the risk of osteonecrosis, and improve the patient's postoperative comfort. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a hip joint prosthesis structure according to this application.

[0039] Figure 2 Schematic diagram of interpositional acetabular cup structure Figure 1 .

[0040] Figure 3 Schematic diagram of interpositional acetabular cup structure Figure 2 .

[0041] Figure 4 Schematic diagram of interpositional acetabular liner structure Figure 1 .

[0042] Figure 5 Schematic diagram of interpositional acetabular liner structure Figure 2 .

[0043] Figure 6 This is a schematic diagram of the interpositional acetabular fixation screw structure.

[0044] Figure 7 This is a schematic diagram of the femoral head reconstruction device.

[0045] Figure 8 This is a schematic diagram of the joint friction surface prosthesis structure.

[0046] Figure 9 This is a schematic diagram of the bone ingrowth support cage structure.

[0047] Figure 10 This is a schematic diagram of the central fixed column structure.

[0048] Figure 11 This is a schematic diagram of the artificial ligament suture structure.

[0049] Figure 12 yes Figure 11 A sectional view.

[0050] Figure 13 This is a schematic diagram of an artificial ligament structure.

[0051] Explanation of reference numerals in the attached diagrams: 1. Interstitial acetabular prosthesis; 11. Interstitial acetabular cup; 111. Mounting hole; 112. Mounting groove; 113. Petal opening; 114. Barbed post; 12. Interstitial acetabular fixation screw; 121. Drill section; 122. Chip removal section; 123. Threaded section; 1231. Fine threaded section; 1232. Coarse threaded section; 124. Compression section; 125. Spherical structure; 13. Interstitial acetabular liner; 131. Mounting post; 14. Acetabular ligament protection zone; 141. Artificial ligament; 1 5. Shock absorber; 151. First guide post; 152. Second guide post; 153. Titanium alloy flexible spring; 2. Femoral head reconstruction device; 21. Joint friction surface prosthesis; 211. Ligament crossing area; 22. Bone ingrowth support cage; 221. Central fixation ring; 222. Femoral head support structure; 223. Second ligament protection area; 224. Soft spring fixation post; 225. Central hole; 226. Central fixation post; 2261. 3D printed trabecular bone; 3. Acral fossa; 4. Femoral head. Detailed Implementation

[0052] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0053] This application discloses a hip joint prosthesis. (Refer to...) Figure 1 The hip joint prosthesis includes an interpositional acetabular prosthesis 1 and a femoral head reconstruction device 2. The interpositional acetabular prosthesis 1 is attached to the acetabular socket 3 of the pelvis and fixed by fixation screws. The femoral head reconstruction device 2 is located between the interpositional acetabular prosthesis 1 and the femoral head 4 and is slidably connected to it, thereby achieving the effect of hip joint stability and functional recovery by preserving the femoral head 4 and ligaments.

[0054] Reference Figures 2-5 Specifically, the intercalated acetabular prosthesis 1 includes an intercalated acetabular cup 11, an intercalated acetabular fixation screw 12, and an intercalated acetabular liner 13. The intercalated acetabular cup 11 has an installation hole 111, through which the intercalated acetabular fixation screw 12 passes and is fixedly connected to the acetabular socket 3 of the pelvis, thus fixing the intercalated acetabular cup 11. The top of the intercalated acetabular liner 13 is provided with a conical installation post 131. The top of the inner side of the intercalated acetabular cup 11 has an installation groove 112 for the installation post 131 to mate with. The installation post 131 mates with the installation groove 112 to connect the intercalated acetabular liner 13 and the intercalated acetabular cup 11. The top of the installation post 131 has a cross groove to facilitate the installation of the installation post 131 into the installation groove 112. The femoral head reconstruction device 2 includes a joint friction surface prosthesis 21 and a bone ingrowth support cage 22, which is inserted into the femoral head 4.

[0055] Reference Figures 11-13Both the interpositional acetabular cup 11 and the interpositional acetabular liner 13 have acetabular ligament protection zones 14, with artificial ligaments 141 placed around them. The artificial ligaments 141 are made of elastic cores with three different pitches, allowing for free bending greater than 90 degrees. The interpositional acetabular cup 11 also has multiple petal openings 113, enabling elliptical deformation and a better fit to the acetabular fossa 3 of the pelvis. The artificial ligaments 141 can be made of materials such as nylon or polyester fiber.

[0056] Reference Figure 3 , Figure 4 A shock absorber 15 is provided between the intercalated acetabular cup 11 and the intercalated acetabular liner 13. The shock absorber 15 includes a first guide post 151 disposed on the inner surface of the intercalated acetabular cup 11, a second guide post 152 disposed on the outer surface of the intercalated acetabular liner 13 opposite to the first guide post 151, and a titanium alloy flexible spring 153 disposed between the first guide post 151 and the second guide post 152. The first guide post 151 is a tube and is sleeved on the outside of the second guide post 152. The titanium alloy flexible spring 153 is located inside the first guide post 151, with one end abutting against the inner side of the intercalated acetabular cup 11 and the other end abutting against the end of the second guide post 152. The titanium alloy flexible spring 153 can be selected with different hardness levels to meet the needs of different patients. The shock absorber 15 can effectively buffer the vibration between the acetabular liner and the acetabular cup, protecting the hip joint structure from impact damage. At the same time, the titanium alloy flexible spring 153 converts the vibration energy into physical stimulation of the acetabular fossa 3, promoting blood circulation and reducing the risk of osteonecrosis.

[0057] Reference Figure 5 The side of the interpositional acetabular liner 13 away from the interpositional acetabular cup 11 is an inner spherical surface with a roughness of no more than Ra0.5. The inner spherical surface can be polished to reduce friction with the femoral head reconstruction device 2.

[0058] Reference Figure 2 A barbed post 114 is provided on the outer surface of the interposition acetabular cup 11, and the barbed post 114 is inserted into the acetabular fossa 3. The barbed post 114 can be made of stainless steel or titanium alloy to increase the contact area with the acetabular fossa 3.

[0059] Reference Figure 6Three intercalation acetabular fixation screws 12 are provided. Each intercalation acetabular fixation screw 12 includes a drill section 121, a chip removal section 122 connected to the drill section 121, a threaded section 123 located at the other end of the chip removal section 122, and a pressure section 124 located at the other end of the threaded section 123. The pressure section 124 is conical. A spherical structure 125 is provided at the other end of the pressure section 124. The spherical structure 125 is located inside the intercalation acetabular cup 11. The remaining structure passes through the mounting hole 111 of the intercalation acetabular cup 11 and is fixed in the acetabular fossa 3. The drill section 121 can be made of cemented carbide to improve drilling efficiency. The chip removal section 122 can be designed in a spiral shape to facilitate the removal of bone fragments.

[0060] The threaded section 123 includes a fine threaded section 1231 connected to the chip removal section 122 and a coarse threaded section 1232 connected to the fine threaded section 1231. The fine threaded section 1231 has a shorter pitch, making it easier to enter and providing better stability when first implanted into the bone. The coarse threaded section 1232 has a longer pitch, and since the front end has already been stably inserted, subsequent implantation can be performed with less effort. The use of the coarse threaded section 1232 and the fine threaded section 1231 can prevent the screw from loosening after implantation.

[0061] Reference Figure 7 , Figure 8 The joint friction surface prosthesis 21 is made of ceramic material, and the joint friction surface prosthesis 21 has a ligament crossing area 211 corresponding to the acetabular ligament protection zone 14.

[0062] Reference Figure 7 , Figure 9 The bone ingrowth support cage 22 includes a central fixation ring 221. A femoral head support structure 222 is circumferentially arranged on the central fixation ring 221. The femoral head support structure 222 is inserted into the femoral head 4 and is shaped like a sharp blade with a tantalum coating. A second ligament protection zone 223 is formed between the femoral head support structures 222. Multiple flexible spring fixation posts 224 are arranged on the side of the central fixation ring 221 away from the femoral head 4, and these posts are connected to the joint friction surface prosthesis 21. A central hole 225 is formed in the middle of the central fixation ring 221. The central hole 225 is filled with bone and / or an artificial ligament 141 is introduced and fixed within the central hole 225. A central fixation post 226 is arranged on the side of the central fixation ring 221 closest to the femoral head 4. The central fixation post 226 has threads on its outer side and is fixed to the femoral head 4 via these threads. The central fixation post 226 may use trapezoidal threads to improve fixation strength.

[0063] Reference Figure 10The central fixation post 226 is tapered, and its inner threaded inner diameter features a rough, porous design. This design mimics the structural characteristics of natural trabecular bone, significantly promoting osteocyte attachment and proliferation, thereby facilitating inward bone growth, enhancing the long-term stability between the prosthesis and the femoral head 4, effectively preventing prosthesis loosening, and extending the prosthesis's lifespan. A 3D-printed trabecular bone structure 2261 is located at the top of the central fixation post 226. This 3D-printed trabecular bone structure 2261 can be made of hydroxyapatite material to further promote osseointegration.

[0064] The implementation principle of a hip joint prosthesis according to this application embodiment is as follows: by preserving the femoral head 4 and ligaments, and combining an interpositional acetabular prosthesis 1 and a femoral head reconstruction device 2, stability and functional restoration of the hip joint are achieved. The design of the interpositional acetabular prosthesis 1 ensures the integrity of the acetabular fossa 3 structure, while the femoral head reconstruction device 2 promotes bone regeneration through physical stimulation, ultimately removing most of the prosthesis and restoring the original function of the hip joint. This design not only preserves important weight-bearing relationships but also reduces the occurrence of postoperative complications and improves the patient's quality of life.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hip joint prosthesis arranged between a human femoral head (4) and a pelvic acetabular socket (3), characterized in that The application relates to a hip joint prosthesis, which comprises an interposition acetabular prosthesis (1) arranged near a pelvic acetabular fossa (3) and comprising an interposition acetabular cup (11) and an interposition acetabular fixing screw (12) which are combined with the pelvic acetabular fossa (3), and an interposition acetabular liner (13) arranged on the side of the interposition acetabular cup (11) far from the pelvic acetabular fossa (3), wherein the interposition acetabular cup (11) is provided with a mounting hole (111), the interposition acetabular fixing screw (12) is fixedly connected with the pelvic acetabular fossa (3) through the mounting hole (111) and is used for fixing the interposition acetabular cup (11), and the top of the interposition acetabular liner (13) is provided with a tapered mounting column (131), the inner side of the top of the interposition acetabular cup (11) is provided with a mounting groove (112) matched with the mounting column (131), and the mounting column (131) and the mounting groove (112) are matched and mounted to connect the interposition acetabular liner (13) and the interposition acetabular cup (11); a femoral head reconstruction device (2) is arranged between the interposition acetabular prosthesis (1) and a femoral head (4) and is slidably connected with the interposition acetabular liner (13), and the femoral head reconstruction device (2) comprises an articular surface prosthesis (21) and a bone ingrowth support cage (22), and the bone ingrowth support cage (22) is inserted into the femoral head (4); the interposition acetabular cup (11) and the interposition acetabular liner (13) are both provided with an acetabular ligament protection area (14), the acetabular ligament protection area (14) is provided with an artificial ligament (141), and the artificial ligament (141) is wrapped around the acetabular ligament protection area (14); the wire of the artificial ligament (141) is made of three elastic cores with different pitches; the interposition acetabular cup (11) is further provided with a plurality of petal openings (113), and the interposition acetabular cup (11) is deformed into an ellipse through the petal openings (113); the articular surface prosthesis (21) is made of ceramic material, and the articular surface prosthesis (21) is provided with a ligament passing area (211) corresponding to the acetabular ligament protection area (14); the bone ingrowth support cage (22) comprises a central fixing ring (221), the central fixing ring (221) is circumferentially provided with femoral head support structures (222), the femoral head support structures (222) are inserted into the femoral head (4), the femoral head support structures (222) are in the shape of sharp knives and are coated with a tantalum coating, the central fixing ring (221) is provided with a plurality of soft spring fixing columns (224) away from the femoral head (4), the soft spring fixing columns (224) are connected with the articular surface prosthesis (21), a central hole (225) is arranged in the central fixing ring (221), the central hole (225) is filled with bone and / or the central hole (225) introduces the artificial ligament (141) and fixes the artificial ligament (141). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The central fixed ring (221) is provided with a central fixed column (226) near the side of the femoral head (4), the outer side of the central fixed column (226) is provided with threads, and is fixed with the femoral head (4) through threads.

2. The hip prosthesis of claim 1, wherein: The shock absorbing member (15) is arranged between the interposition acetabular cup (11) and the interposition acetabular liner (13), the shock absorbing member (15) comprises a first guide column (151) arranged on the inner surface of the interposition acetabular cup (11), a second guide column (152) arranged on the outer surface of the interposition acetabular liner (13) and opposite to the first guide column (151), and a titanium alloy flexible spring (153) arranged between the first guide column (151) and the second guide column (152), the first guide column (151) is a pipe body and is sleeved outside the second guide column (152), and the titanium alloy flexible spring (153) is located inside the first guide column (151) and abuts against one end of the interposition acetabular cup (11) and the other end of the second guide column (152).

3. The hip prosthesis of claim 2, wherein: The side of the interposition acetabular liner (13) away from the interposition acetabular cup (11) is an inner spherical surface, and the roughness of the inner spherical surface is not greater than Ra0.

5.

4. The hip prosthesis of claim 3, wherein: The outer surface of the interposition acetabular cup (11) is provided with a barb column (114), and the barb column (114) is introduced into the acetabular cavity (3).

5. The hip prosthesis of claim 4, wherein: The three interposition acetabular fixation screws (12) comprise a drill bit section (121), a chip removal section (122) connected with the drill bit section (121), a threaded section (123) arranged at the other end of the chip removal section (122), and a pressurizing section (124) arranged at the other end of the threaded section (123), wherein the pressurizing section (124) is conical; the other end of the pressurizing section (124) is provided with a spherical structure (125), the spherical structure (125) is located inside the interposition acetabular cup (11), and the remaining structures are fixed in the acetabular cavity (3) through the installation hole (111) of the interposition acetabular cup (11).

6. The hip prosthesis of claim 5, wherein: The threaded section (123) comprises a fine threaded section (1231) connected with the chip removal section (122) and a coarse threaded section (1232) connected with the fine threaded section (1231).

7. The hip prosthesis of claim 1, wherein: The central fixed column (226) is conical, the end of the central fixed column (226) away from the central fixed ring (221) is provided with a 3D printed trabecular bone (2261) structure, and the inner diameter of the threads is provided with a rough and porous form.

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