Bone defect hip joint prosthesis

Abstract

The invention discloses a bone defect hip joint prosthesis which comprises a semi-crescent acetabulum edge filling block set, a bone metal defect block, an acetabulum wall defect supporting block, a cylinder supporting block, an angle cushion block, a locking nail, a locking nut, an assembling screw, an acetabulum plugging nail and an acetabulum supporting block. The semi-crescent acetabulum edge filling block group comprises two groups of semi-crescent acetabulum edge filling blocks, the two groups of semi-crescent acetabulum edge filling blocks are assembled through matching of pin holes and pins, and the outer circle of the bone metal defect block of the acetabulum supporting block is connected with the semi-crescent acetabulum edge filling block group through bone cement. According to the bone defect hip joint prosthesis, the irregular defect area of the acetabular edge is effectively filled up, the screw hole positions and the kirschner wire hole positions of various specifications are formed in the surface of the bone defect hip joint prosthesis to provide multi-dimensional fixing selection, the overall structure achieves precise reconstruction under the premise that the biomechanical property is guaranteed through the synergistic effect of multiple components, and the bone defect hip joint prosthesis is high in practicability. And the postoperative prosthesis loosening and wearing risks are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the field of joint prostheses, in particular to a hip joint prosthesis for bone defects. Background Art

[0002] In the field of bone defect repair and artificial joint replacement technology, existing prosthetic systems are typically reconstructed using modular components to address the clinical needs of insufficient bone volume or anatomical abnormalities after hip arthroplasty. These prostheses must balance initial stability, long-term biological fixation, and functional recovery, but their structural design often faces multiple challenges: Traditional locking mechanisms often utilize a single operating channel, requiring repeated adjustments of the fixation angle during surgery, resulting in prolonged surgery and limited locking reliability due to operational space constraints; screw fixation channels are often unidirectional, making it difficult to adapt to the differences in bone orientation caused by complex anatomical variations, which can easily lead to stress concentration at the prosthesis-bone interface; support structures typically utilize standardized interface designs, which either overemphasize bone ingrowth at the expense of joint surface wear resistance or pursue smoothness, resulting in insufficient bone integration; Furthermore, the contact surfaces of conventional support components are often flat or simply curved, forming point or line contacts with adjacent anatomical structures. This can easily generate local stress peaks during joint load transfer, accelerating prosthesis loosening or interface wear.

[0003] While existing technical solutions attempt to improve performance by increasing the number of components or adjusting material ratios, the core structure still suffers from the following flaws: the locking fixation method lacks a quick adjustment mechanism, significantly increasing the difficulty of operating complex cases; the fixed channel direction design limits the prosthesis's adaptability to individualized anatomical structures; the single-function support interface cannot simultaneously meet the requirements of bone integration and wear resistance; and the contact surface geometry does not adequately match the biomechanical characteristics of the human body, resulting in inefficient load transfer. These issues directly affect the long-term stability of the prosthetic system, leading to high rates of postoperative prosthetic loosening, interface wear, and reoperation. This is especially true when faced with severe bone defects or unique anatomical variations, where traditional designs struggle to achieve precise mechanical reconstruction. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present application provides a bone defect hip joint prosthesis to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a bone defect hip joint prosthesis, comprising a semi-crescent-shaped acetabular rim filling block group, a bone metal defect block, an acetabular wall defect support block, a column support block, an angle pad, a locking nail, a locking nut, an assembly screw, an acetabular sealing nail and an acetabular support block, wherein the semi-crescent-shaped acetabular rim filling block group comprises two groups of semi-crescent-shaped acetabular rim filling blocks, the two groups of semi-crescent-shaped acetabular rim filling blocks are assembled by matching with pins through pin holes, the outer circle of the bone metal defect block of the acetabular support block is connected with the semi-crescent-shaped acetabular rim filling block by bone cement. The crescent-shaped acetabular rim filling block group is connected, and a screw fixing hole and a first Kirschner wire hole are provided on the outside of the semi-crescent-shaped acetabular rim filling block group. A formal screw hole at a circular arc and an inclined screw hole at a circular arc are respectively provided on the left and right sides of the outside of the semi-crescent-shaped acetabular rim filling block group. The inner cavities of the screw fixing hole, the formal screw hole at a circular arc and the inclined screw hole at a circular arc are all equipped with assembly screws. A semi-circular concave block is provided on the outside of the semi-crescent-shaped acetabular rim filling block group, and the outside of the semi-circular concave block is equipped with an oblique Kirschner wire hole at a circular arc.

[0006] The outside of the bone metal defect block is respectively provided with a bottom screw fixing hole, a second Kirschner wire hole, an operation hole and an arc Kirschner wire oblique hole. The inside of the two groups of operation holes are connected with locking nails, and the outside of the locking nail is provided with a locking nut. The outside of the bone metal defect block is respectively provided with an arc straight hole and an arc oblique hole, and the inner cavity of the arc oblique hole and the arc straight hole is connected with the assembly screw.

[0007] The acetabular wall defect support block is provided with a first bolt hole and a second bolt hole on the left and right sides of its exterior, a trabecular bone interface and a metal polishing interface on the bottom of the acetabular wall defect support block, a first concave arc surface and a second concave arc surface on the left and right sides of its exterior, an L-shaped inlay is provided on the exterior of the acetabular wall defect support block, and inclined surfaces are provided on both sides of its exterior.

[0008] Preferably, the outside of the acetabular wall defect support block is connected to the angle pad, and the outside of the acetabular wall defect support block is equipped with a rectangular block, and the angle pad and the support block are combined to form an adjustable support system; the outside of the rectangular block and the angle pad are both provided with circular grooves, and the circular groove structure reduces weight and reserves space for bone cement filling; the outside of the angle pad and the rectangular block are both provided with short nails, and the short nail structure enhances anti-rotation stability.

[0009] Preferably, the column support block is assembled on the outside of the bone metal defect block by bone cement, and the column structure fills the segmental bone defect and transfers the load; the column support block includes a connecting seat, and the modular connecting seat is adapted to column components of different diameters.

[0010] Preferably, the outside of the connecting seat is equipped with an eccentric column, and the eccentric design compensates for the offset bone defect; the outside of the eccentric column is provided with an arc protrusion, and the arc protrusion enhances the contact area and anti-settling performance.

[0011] Preferably, a reinforcing pad is provided on the outside of the arc protrusion, which disperses stress and prevents local crushing; the connecting seat includes an arc and a straight structure, and the connecting seat is connected to the bone metal defect block through bone cement, and the composite structure adapts to the fixation requirements of different anatomical morphologies.

[0012] Preferably, the outside of the connecting seat is equipped with a straight column, which provides axial rigid support; the left and right sides of the straight column are both flat designs, and the flat structure prevents the column from rotating and displacing.

[0013] Preferably, the outside of the bone metal defect block is equipped with an acetabulum sealing nail, and the acetabulum sealing nail is connected to the bone metal defect block through bone cement. The sealing nail seals the medullary cavity to prevent tissue fluid leakage; the bottom of the acetabulum sealing nail is provided with an internal hexagonal groove, and the internal hexagonal structure is adapted to the operation of standardized surgical instruments.

[0014] Preferably, the trabecular interface and the metal polishing interface include a trabecular interface and a metal polishing interface, and the dual-interface design takes into account both bone integration and wear resistance; the outside of the acetabular support block is provided with a screw hole structure, and the multi-screw hole layout realizes a personalized fixation solution.

[0015] Preferably, the first concave arc surface and the second concave arc surface are in contact with the outside of the semi-lunar acetabular rim filling block group through bone cement, and the arc surface contact design increases the contact area and improves the fixation strength.

[0016] Preferably, the outside of the angle pad is provided with an adjustable angle of 5-30°, and the adjustable angle design is adapted to different anatomical variation cases; and a light hole structure is provided, and the light hole facilitates the position confirmation by X-ray fluoroscopy during surgery; the bottom of the locking nail is equipped with a nail body, and the nail body thread design prevents failure due to pull-out.

[0017] In summary, the present application provides a hip joint prosthesis for bone defects, which has the following beneficial effects: This bone defect hip joint prosthesis achieves precise adaptation to complex acetabular defect shapes through modular combination design. The split structure of the semi-crescent-shaped filling block group and the pin connection method can flexibly adjust the assembly angle and effectively fill the irregular defect area of ​​the acetabular rim. The Kirschner wire holes set on its surface provide multi-dimensional fixation options, enhance the initial stability of the prosthesis and the host bone, provide a universal standardized prosthesis, diversified assembly and coordination, save surgical time, and are suitable for revision surgery or patients with local tumors.

[0018] This bone defect hip prosthesis uses dual operation holes in the metal defect block, which is convenient for rapid locking and fixation during surgery. The arc-shaped hole design on its surface can match bone structures with different anatomical orientations, improving the stress dispersion effect. The acetabular wall support block promotes bone ingrowth while maintaining the smoothness of the joint surface through the composite design of the trabecular bone interface and the metal polishing interface. Its L-shaped insert and concave arc surface structure can form surface contact support with adjacent anatomical structures, effectively dispersing joint loads. The inclined surface design reduces edge stress concentration during movement. Combined with the use of columnar support blocks and angled pads, customized support solutions can be provided for different defect sites. The overall structure achieves precise reconstruction while ensuring biomechanical properties through the synergistic effect of multiple components, significantly reducing the risk of prosthetic loosening and wear after surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an external schematic diagram of the semi-crescent-shaped acetabular rim filling block of the present invention.

[0020] Figure 2 It is a partial cross-sectional view of the semi-crescent-shaped acetabular rim filling block of the present invention.

[0021] Figure 3 It is an external schematic diagram of the acetabular wall defect support block of the present invention.

[0022] Figure 4 It is an external schematic diagram of the angle pad of the present invention.

[0023] Figure 5 It is an external schematic diagram of the column support block of the present invention.

[0024] Figure 6 It is an external schematic diagram of the locking nail, locking nut, screw and acetabulum sealing nail of the present invention.

[0025] Figure 7 This is an example diagram showing the appearance of the acetabular wall defect support block of the present invention.

[0026] Figure 8 This is an example diagram showing the appearance of a semi-crescent-shaped acetabular rim filling block group of the present invention.

[0027] Description of reference numerals: 1. Semi-lunar acetabular rim filling block group; 11. First K-wire hole; 12. Screw fixation hole; 13. Regular screw hole at the arc; 14. Inclined screw hole at the arc; 15. Semi-circular concave block; 16. Oblique K-wire hole at the arc; 2. Bone metal defect block; 21. Bottom screw fixation hole; 22. Second K-wire hole; 23. Operation hole; 24. Oblique K-wire hole at the arc; 25. Oblique hole at the arc; 26. Regular hole at the arc; 3. Acetabular wall defect support block; 31. First Bolt hole; 32. Trabecular interface and metal polishing interface; 33. Second bolt hole; 34. First concave arc surface; 35. L-shaped insert; 36. Inclined surface; 37. Second concave arc surface; 4. Column support block; 41. Eccentric column; 42. Arc protrusion; 43. Connecting seat; 44. Straight column; 5. Angle pad; 51. Circular groove; 52. Short nail; 53. Rectangular block; 6. Locking nail; 61. Nail body; 7. Locking nut; 8. Screw; 9. Acetabular sealing nail; 10. Acetabular support block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] This application provides a technical solution, please refer to Figure 1 and Figure 2 A bone defect hip joint prosthesis includes a semi-lunar acetabular rim filling block group 1, a bone metal defect block 2, an acetabular wall defect support block 3, a column support block 4, an angle spacer 5, a locking screw 6, a locking nut 7, an assembly screw 8, an acetabular sealing screw 9 and an acetabular support block 10; The acetabular wall defect support block 3 and the semi-lunar acetabular rim filling block group 1 have various shapes. Figure 7 and Figure 8 , including but not limited to the examples in the figure.

[0030] The semi-lunar acetabular rim filler set 1 includes two sets of semi-lunar acetabular rim fillers. The two sets of semi-lunar acetabular rim fillers are assembled by pin holes and pins. The modular combination design can adapt to different forms of acetabular rim defects. The curved contact surface matches the anatomy of the human acetabulum. The modular design allows the selection of fillers with different curvatures according to the defect range to achieve anatomical reconstruction. The modular design also reduces medical costs by reducing the number of inventory specifications, and can be quickly trial-fitted and adjusted during surgery, shortening surgical exposure time and reducing the risk of infection.

[0031] See also Figure 3 The outer circle of the bone metal defect block 2 of the acetabular support block 10 is connected to the semi-lunar acetabular rim filling block group 1 through bone cement. The bone cement fills the gap to form a biomechanical locking structure. The mechanical interlocking is achieved by the penetration of bone cement into the microporous surface, thereby enhancing the anti-rotation stability of the interface. The microporous surface treatment technology enables bone cement to penetrate to a depth of 0.5 to 1.0 mm, forming a micro-mechanical interlocking structure. Biomechanical tests have confirmed that the torsional strength is increased by more than 40% compared to traditional planar connections.

[0032] The outside of the semi-lunar acetabular rim filling block set 1 is provided with a screw fixation hole 12 and a first Kirschner wire hole 11. The multi-directional fixation structure enhances initial stability. The Kirschner wire hole provides a temporary fixation point, and the screw fixation hole 12 achieves permanent fixation, forming a double guarantee. See also Figure 4 The multi-directional fixation structure disperses stress concentration points, reducing the maximum shear stress of the interface to less than 60% of the traditional fixation method, effectively delaying the loosening cycle of the prosthesis.

[0033] See 5 and Figure 6 The left and right sides of the outer side of the semi-lunar acetabular rim filling block group 1 are respectively provided with a regular screw hole 13 at the arc and an inclined screw hole 14 at the arc. The inclined hole position design is adapted to the fixation requirements of asymmetric bone defects. The inclination angle matches the anatomical axis of the acetabular column and optimizes the distribution of the holding force of the screw 8. The 15°-25° variable angle design of the inclined screw hole 14 at the inclined arc makes the angle between the axis of the screw 8 and the principal stress direction ≤10°. Finite element analysis has confirmed that the holding force of the screw 8 can be increased by 25% to 35%.

[0034] The inner cavities of the screw fixing hole 12, the formal screw hole 13 at the arc, and the inclined screw hole 14 at the arc are all equipped with assembly screws 8. The taper design of the screw 8 achieves a pressure fixation effect. The screw 8 generates a pre-tightening force by squeezing the bone cement layer to eliminate interface micro-motion; The 3°-5° taper design of screw 8 generates an axial displacement of 0.1 to 0.3 mm when tightened, forming a continuous preload. Dynamic fatigue tests show that the interface stability can be maintained for more than 10 years.

[0035] The outside of the semi-lunar acetabular rim filling block group 1 is provided with a semicircular concave block 15, and the outside of the semicircular concave block 15 is equipped with an arc-shaped Kirschner wire oblique hole 16. The oblique hole design facilitates temporary fixation operation during surgery. The Kirschner wire can be inserted along the axis of the acetabulum to reduce soft tissue interference.

[0036] The 20°-30° inclination angle design of the Kirschner wire oblique hole position 16 at the arc makes the insertion direction of the Kirschner wire parallel to the direction of the joint capsule fibers, avoiding puncture and damage to key vascular structures such as the medial femoral circumflex artery.

[0037] The exterior of the bone metal defect block 2 is respectively provided with a bottom screw fixing hole 21, a second Kirschner wire hole 22, an operation hole 23, and an arc Kirschner wire oblique hole 24. The double Kirschner wire holes achieve three-dimensional spatial positioning, and the orthogonally arranged Kirschner wire holes can construct a three-dimensional coordinate system to assist in the precise alignment of the prosthesis. The three-dimensional coordinate system is imported into the navigation system through preoperative CT data to achieve sub-millimeter positioning accuracy, so that the prosthesis placement error is controlled within the range of ±1°.

[0038] The two sets of operating holes 23 are internally connected with locking pins 6, and the locking pins 6 are externally provided with locking nuts 7. The mechanical locking structure prevents the components from loosening. The double nut anti-loosening design offsets the vibration load through the pre-tightening force to avoid failure after long-term use. The double-nut anti-loosening structure uses Belleville washers for pre-tightening, which can still maintain more than 90% of the initial pre-tightening force under a 1000N cyclic load, meeting the requirements of ASTM F2028.

[0039] The outside of the bone metal defect block 2 is respectively provided with a straight hole 26 at the arc and an oblique hole 25 at the arc, and the inner cavities of the oblique hole 25 at the arc and the straight hole 26 at the arc are connected with the assembly screw 8. The combination of the straight and oblique holes meets the needs of bone defect repair at different angles. The direction of the oblique hole is consistent with the stress trajectory of the acetabulum weight-bearing area, optimizing the load transfer path.

[0040] The 10°-15° inclination angle of the oblique hole 25 at the arc forms an angle of 15°-20° with the normal direction of the acetabular articular surface, so that the load transfer path avoids the weak bone area and reduces the risk of femoral head collapse.

[0041] The outside of the acetabular wall defect support block 3 is connected to the angle pad 5, and the outside of the acetabular wall defect support block 3 is equipped with a rectangular block 53. The angle pad 5 and the support block are combined to form an adjustable support system. By stacking modular pads, 0-30° angle adjustment is achieved to adapt to acetabular anteversion / valgus deformity; The adjustable support system uses a combination of wedge-shaped pads to achieve incremental adjustment in 5° units, with an angle adjustment accuracy of ±2°, meeting the needs of correcting complex deformities such as congenital hip dysplasia.

[0042] The rectangular block 53 and the angled spacer 5 are both provided with circular grooves 51 on their exteriors. The circular grooves 51 reduce weight and reserve space for bone cement filling. The circular grooves form a bone cement reservoir, thereby enhancing interface bonding strength. The honeycomb arrangement design of the circular grooves 51 increases the bone cement filling volume by 30% to 40%, and improves the interface shear strength to above 15 MPa, which complies with the ISO 7207-4 standard.

[0043] Short nails 52 are provided on the outside of the angle spacer 5 and the rectangular block 53. The short nails 52 structure enhances the anti-rotation stability. The conical short nails 52 are embedded in the host bone cortex to form a mechanical interlocking.

[0044] The cone angle of the short nail 52 is designed to be 60°-75°, the depth of the spiral groove on the surface of the nail body 61 is 0.2-0.3 mm, and the pull-out force is increased by more than 200% compared with the smooth nail body 61.

[0045] The column support block 4 is assembled on the outside of the bone metal defect block 2 through bone cement. The column structure fills the segmental bone defect and transfers the load. The hollow design reduces the stress shielding effect and promotes bone ingrowth. The honeycomb porosity of the hollow structure reaches 60% to 70%, and the pore diameter is 400-600μm, which meets the optimal pore parameters for bone ingrowth. The bone integration rate can reach more than 85% 6 months after surgery.

[0046] The outside of the connecting seat 43 is equipped with a straight column 44, which provides axial rigid support; the left and right sides of the straight column 44 are both flat designs, and the flat structure prevents the column from rotating and displacing.

[0047] The modular connector 43 uses a Morse taper connection and a locking pin to achieve zero-clearance fit. Its axial load capacity reaches 3000N, meeting the needs of patients with high activity levels.

[0048] The outside of the connecting seat 43 is equipped with an eccentric column 41. The eccentric design compensates for the offset bone defect. The eccentricity can be adjusted within a range of 5mm to correct the abnormal eccentricity of the femoral neck. The 5-level adjustable scale design of the eccentric column 41 enables the eccentricity adjustment accuracy to reach 1mm. Precise adjustment can be completed through intraoperative X-ray fluoroscopy, avoiding repeated disassembly and assembly.

[0049] The outside of the eccentric column 41 is provided with an arc protrusion 42, which enhances the contact area and anti-sinking performance. The height of the protrusion matches the host bone density to prevent long-term sinking.

[0050] The curvature radius of the arc protrusion 42 matches the curvature of the host bone cortical surface, the contact area is increased by more than 50%, and the pressure per unit area is reduced to below the bone absorption threshold.

[0051] The doctor determines the type and extent of the acetabular defect through three-dimensional CT reconstruction. For cases of acetabular rim defects, the basic module in the semi-lunar acetabular rim filling block group 1 is first selected. This component consists of two groups of semi-lunar filling blocks with different curvatures, which are pre-assembled through pin holes and matching pins. The modular design allows the selection of 15°, 30° or 45° arc module combinations according to the curvature of the defect, and its anatomical arc surface forms a surface contact with the host acetabular socket. For local defects of the anterior or posterior edge, a single group of filling blocks can be used alone; when it involves a full circumferential defect, the two groups of modules are spliced ​​into a complete ring through a dovetail structure, and the joints are filled with bone cement to form a continuous mechanical structure.

[0052] The semi-lunar acetabular rim filling block group 1 adopts two groups of semi-lunar structures and is assembled through pin holes and pins. It can be modularly combined according to the shape of the acetabulum defect, and precise alignment is achieved through pin positioning. The screw fixing holes 12, the screw holes 13 at the arc and the inclined screw holes 14 at the arc form a multi-directional fixed structure, which can be combined with the assembly screws 8 to achieve three-dimensional mechanical locking. The combination design of the semi-circular concave block 15 and the oblique Kirschner wire hole 16 at the arc not only meets the temporary fixation requirements, but also avoids the Kirschner wire interfering with the main structure assembly; the bone metal defect block 2 is connected to the semi-lunar acetabular rim filling block group 1 through bone cement, and its bottom screw fixing hole 21 and the second Kirschner wire hole 22 constitute a double fixation system. The operating hole 23 cooperates with the locking pin 6 and the locking nut 7 to form an adjustable locking mechanism. The staggered layout of the positive hole 26 at the arc and the oblique hole 25 at the arc enables the assembly screw 8 to form a cross-fixed structure, which effectively resists rotational displacement; the acetabular wall defect support block 3 realizes multi-point rigid connection through the first bolt hole 31 and the second bolt hole 33. The composite design of the trabecular interface and the metal polishing interface 32 takes into account the bone growth requirements and wear resistance. The first concave arc surface 34 and the second concave arc surface 37 fit the natural curvature of the acetabulum, the L-shaped insert 35 enhances the edge support strength, and the inclined surface 36 structure disperses stress concentration. Each component forms an integrated mechanical conduction path through the assembly screw 8 and the acetabular sealing pin 9, effectively restoring the biomechanical environment of the hip joint.

[0053] In the initial fixation stage, a multi-directional fixation structure designed on the surface of the semi-lunar acetabular rim filling block group 1 is used. First, a 2.0mm Kirschner wire is inserted into the Kirschner wire oblique hole 16 at the arc of the semi-circular concave block 15, and the host bone is obliquely driven into the acetabulum axis to achieve temporary spatial positioning. Subsequently, an assembly screw 8 with a diameter of 4.5mm is implanted in the screw fixation hole 12. The taper design of the screw 8 makes the screw body 61 form an interference fit with the hole wall, squeezing the bone cement layer to produce an axial displacement of 0.2 to 0.3mm, and eliminating interface micro-motion through the material creep effect. For the asymmetric defect area, a locking screw 6 with a locking nut 7 is implanted in the oblique screw hole 14 at the arc. The inclination angle forms an angle of 15° with the anatomical axis of the acetabular column, so that the holding force direction of the screw 8 coincides with the main stress trajectory.

[0054] When there is a bone defect in the acetabulum wall, the support system assembly stage begins. The acetabulum wall defect support block 3 is combined with the angle pad 5, and precise alignment is achieved through the circular groove 51 structure of the rectangular block 53. The angle pad 5 is available in four specifications: 0°, 10°, 20°, and 30°, and angle adjustment is achieved through modular superposition. During adjustment, the basic angle pad 5 is first inserted, and the conical tip of the short nail 52 is used to form a mechanical interlock with the host bone cortex. Subsequently, the corresponding angle pad 5 is superimposed according to the preoperative measurement value, and the circular groove 51 between each layer of pads is filled with bone cement to form a chemical bond. For cases of abnormal anteversion, while the angle pad 5 is superimposed on the outer edge of the acetabulum, a reverse angle compensation block is implanted at the corresponding position of the inner edge of the acetabulum to correct the abnormal angle through the wedge effect.

[0055] For segmental columnar bone defects, a column support system is installed. The connecting seat 43 of the column support block 4 is docked with the bone metal defect block 2, and the eccentric distance of the femoral neck is compensated through the 5mm adjustable range of the eccentric column 41. During installation, first select the connecting seat 43 that matches the diameter of the host bone marrow cavity, rotate the eccentric column 41 to the optimal compensation position, and use the arc protrusion 42 to form multi-point contact with the host bone cortex. Calcium phosphate bone cement is filled in the hollow structure of the column, and pressurized injection is performed through the operating hole 23 with a diameter of 3mm, so that the bone cement penetrates into the microporous structure on the surface of the column to form a mechanical interlocking effect.

[0056] During the multi-component coordinated fixation stage, the bone metal defect block 2 is rigidly connected to the host pelvis through the bottom screw fixation hole 21. A dual-plane fixation strategy is adopted: two assembly screws 8 with a diameter of 6.5 mm are implanted in the projection direction of the anteroposterior film, and the axis of the screw 8 forms a 30° angle with the weight-bearing surface of the acetabulum; in the projection direction of the lateral film, a third screw 8 is implanted through the oblique hole 25 at the arc, and the oblique hole direction forms a 15° angle with the normal direction of the acetabulum articular surface. The three screws 8 form a spatial triangular fixation structure, which cooperates with the temporary fixation of the second Kirschner wire hole 22 to construct a three-dimensional mechanical stabilization system. After the locking screw 6 passes through the double operation hole 23, the pre-tightening force of the locking nut 7 eliminates the thread gap. The double nut structure generates a continuous torque of 1.5 Nm to offset the vibration load generated by postoperative functional exercise.

[0057] During the final integration phase, the semilunar acetabular rim filler assembly 1 and the metal bone defect assembly 2 were biologically fixed using bone cement. To fill the gap, bone cement was first injected into the filler assembly's microporous surface porosity (35%), using negative pressure suction to achieve a cement penetration depth of 2–3 mm. Subsequently, pressure injection was performed at the positive hole 26 of the circular arc of the metal bone defect assembly 2, forming a radial filling pattern along the oblique hole 25 of the circular arc. The final interfacial bond strength was ensured by the following mechanisms: micromechanical interlocking of the cement-metal interface; permeation fusion of the cement with the host bone; and macromechanical constraint of the screw system 8.

[0058] Immediate postoperative stability verification includes: 1. Confirming the positional relationship of each component through C-arm fluoroscopy, focusing on checking whether the inclination angle of the angle pad 5 is consistent with the preoperative plan; 2. Performing a stress test, applying a 500N axial load to the semicircular concave block 15 of the semi-lunar acetabular rim filler group 1, and measuring the interface displacement to be less than 0.5mm; 3. Confirming the bone cement filling density through ultrasonic detection, requiring a micropore filling rate of ≥85%.

[0059] This prosthetic system achieves anatomical reconstruction through a modular design, ensures initial stability through a multi-level fixation mechanism, and extends prosthesis life through biomechanical optimization. Each component can be used independently to address a single defect type or combined to form a complex repair solution, making it particularly suitable for complex acetabular bone defects such as Paprosky type III. Its innovation lies in the organic integration of mechanical fixation principles with biological fixation mechanisms, achieving long-term functional restoration of the bone defect area while ensuring surgical reversibility.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hip joint prosthesis for bone defect, comprising a semi-lunar acetabular rim filling block set, a bone metal defect block, an acetabular wall defect support block, and an acetabular support block, characterized in that: The semi-lunar acetabular rim filling block group includes two groups of semi-lunar acetabular rim filling blocks, the outer circle of the bone metal defect block of the acetabular support block is connected to the semi-lunar acetabular rim filling block group by bone cement, the outer part of the semi-lunar acetabular rim filling block group is provided with a first Kirschner wire hole position, the outer part of the semi-lunar acetabular rim filling block group is provided with a semicircular concave block, and the outer part of the semicircular concave block is equipped with an arc-shaped Kirschner wire oblique hole position; The exterior of the bone metal defect block is respectively provided with a second Kirschner wire hole, two groups of operation holes and an arc Kirschner wire oblique hole, and the exterior of the bone metal defect block is respectively provided with an arc regular hole and an arc oblique hole; The bottom of the acetabular wall defect support block is provided with a trabecular bone interface and a metal polishing interface, the left and right sides of the outside of the acetabular wall defect support block are respectively provided with a first concave arc surface and a second concave arc surface, the outside of the acetabular wall defect support block is provided with an L-shaped inlay, and the outside of the acetabular wall defect support block is provided with inclined surfaces on both sides.

2. The bone defect hip joint prosthesis according to claim 1, characterized in that: The two groups of semi-lunar shaped acetabular rim filling blocks are assembled by pinning, and the left and right sides of the outside of the semi-lunar shaped acetabular rim filling block group are respectively provided with formal screw holes at the circular arc and inclined screw holes at the circular arc, and the inner cavities of the screw fixing holes, the formal screw holes at the circular arc and the inclined screw holes at the circular arc are all equipped with assembly screws.

3. The bone defect hip joint prosthesis according to claim 1, characterized in that: The insides of the two groups of operating holes are connected with locking nails, and the outsides of the locking nails are provided with locking nuts.

4. The bone defect hip joint prosthesis according to claim 2, characterized in that: The inner cavities of the oblique hole at the circular arc and the regular hole at the circular arc are connected with assembly screws.

5. The bone defect hip joint prosthesis according to claim 1, characterized in that: It also includes an angle pad, which is connected to the outside of the acetabular wall defect support block, and the outside of the acetabular wall defect support block is equipped with a rectangular block, the outsides of the rectangular block and the angle pad are both provided with circular grooves, and the outsides of the angle pad and the rectangular block are both provided with short nails; A first bolt hole and a second bolt hole are respectively provided on the left and right sides of the exterior of the acetabulum wall defect support block.

6. The bone defect hip joint prosthesis according to claim 1, characterized in that: It also includes a column support block, which is assembled on the outside of the bone metal defect block through bone cement. The column support block includes a connecting seat, and the outside of the connecting seat is equipped with a straight column, and the left and right sides of the straight column are both flat designs; The outside of the connecting seat is equipped with an eccentric column, the outside of the eccentric column is provided with an arc protrusion, the outside of the arc protrusion is provided with a reinforcing pad, the connecting seat includes an arc and a straight structure, and the connecting seat is connected to the bone metal defect block through bone cement.

7. The bone defect hip joint prosthesis according to claim 1, characterized in that: The outside of the bone metal defect block is equipped with an acetabulum sealing nail, and the acetabulum sealing nail is connected to the bone metal defect block through bone cement. The bottom of the acetabulum sealing nail is provided with an inner hexagonal groove.

8. The bone defect hip joint prosthesis according to claim 1, characterized in that: The trabecular bone interface and the metal polishing interface include a trabecular bone interface and a metal polishing interface, and a screw hole structure is arranged on the outside of the acetabulum support block.

9. The bone defect hip joint prosthesis according to claim 1, characterized in that: The first concave arc surface and the second concave arc surface are in contact with the exterior of the semi-lunar acetabular rim filling block group through bone cement.

10. The bone defect hip joint prosthesis according to claim 1, characterized in that: The outside of the angle pad is provided with an adjustable angle of 5-30 degrees and a light hole structure, and the bottom of the locking nail is equipped with a nail body.

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