Acetabular posterior wall defect reconstruction system

Abstract

The invention discloses a system for reconstruction of acetabular posterior wall defect. It includes a reconstruction prosthesis and a screw. The shape and thickness of the reconstruction prosthesis are consistent with the outer edge of the acetabulum at the defect. The articular surface end of the reconstruction prosthesis is an arc structure. A plurality of screw holes are arranged on the reconstruction prosthesis. The opening directions of the plurality of screw holes are different and all face the outside of the joint. The screw passes through the screw hole to fix the reconstruction prosthesis at the acetabular posterior wall defect. The reconstruction prosthesis includes but is not limited to a reconstruction prosthesis for the entire posterior wall defect of the acetabulum, a reconstruction prosthesis for the upper 2 / 3 of the acetabular posterior wall, a reconstruction prosthesis for the lower 2 / 3 of the acetabular posterior wall, a reconstruction prosthesis for the upper 1 / 3 of the acetabular posterior wall, a reconstruction prosthesis for the middle 1 / 3 of the acetabular posterior wall, and a reconstruction prosthesis for the lower 1 / 3 of the acetabular posterior wall. The invention has the advantages of meeting the needs of reconstruction of various acetabular posterior wall defects, solving the problem of fixation failure or inappropriate internal fixation treatment in patients with severe acetabular posterior wall fractures, and improving the prognosis and quality of life of patients.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and more particularly to a system for reconstructing posterior acetabular wall defects. Background Art

[0002] Acetabular posterior wall fracture is the most common type of acetabular fracture. According to the 1964 Letournel classification, in addition to simple posterior wall fractures, there are other types of fractures combined with posterior wall fractures, such as posterior column combined with posterior wall fractures and transverse combined posterior wall fractures, which account for 35% to 47% of all acetabular fractures. The degree of acetabular posterior wall fracture injury is mainly related to the degree and angle of femoral head impact. Different impacts divide the posterior wall fracture types into three categories: simple posterior wall fracture, comminuted posterior wall fracture, and posterior wall fracture with articular surface compression. Regardless of the type of posterior wall fracture, surgery is often used for treatment, because the prognosis of most patients treated non-surgically cannot bring the expected effect, and when the posterior wall bone fragments accumulate to more than 25%, the stability of the hip joint decreases severely and must be treated surgically.

[0003] Up to now, clinical orthopedic trauma mostly uses reconstruction plates to fix posterior wall fracture fragments, but different fixation methods are used for different fracture types. Simple posterior wall fractures can be fixed firmly and stably with a single or double reconstruction plate or lag screws; for comminuted posterior wall fractures, spring plates or small screws will be added to the reconstruction plate to fix small bone fragments; for posterior wall fractures with articular surface compression, autologous bone or allogeneic bone is also required to reconstruct the compressed part. The prognosis of simple posterior wall fractures can basically achieve the expected treatment effect, while the latter two types of posterior wall fractures often have uneven articular surfaces after treatment and bone absorption after a period of time due to the diversity of fracture fragments or articular surface compression, which will lead to wear of the femoral head and form arthritis, causing pain and movement disorders, and eventually lead to joint replacement. This is very different from the expected surgical effect in clinical practice.

[0004] Clinically, the most effective treatment for severe acetabular posterior wall defects is hip replacement, but this surgical method often requires revision for relatively young patients, so young patients with posterior wall defects need to carefully consider whether it is worthwhile to replace the hip. Chinese patent application with application number 201610539646.6 discloses a acetabular defect reconstruction prosthesis, including: an iliac support, the iliac support includes a support seat and a connecting wing plate arranged on the support seat, and the support seat is in contact with the ilium; an acetabular cup, which is rotatably connected to the support seat. The technical solution of the invention can effectively solve the problems of reconstruction and long-term stability of periacetabular defects in the prior art. However, this invention is mainly aimed at reconstructing the huge pelvic bone defect generated after surgical resection of periacetabular tumors, but the reconstruction prosthesis is too large and is only suitable for the reconstruction of the huge defect involved after the tumor is removed. It has no effect on the reconstruction of a small range of posterior wall defects. The Chinese patent application with application number 201510266407.3 discloses an acetabular reconstruction prosthesis system adapted to different types of acetabular defects, including an acetabular reconstruction pad, an acetabular reconstruction titanium mesh and an acetabular reconstruction bracket, all of which are covered with screw holes on the surface and can be fixed to the part of the acetabular bone with good quality by acetabular screws to achieve the filling and support function of the defect and achieve the effect of immediate stability after surgery; the acetabular reconstruction pad, acetabular reconstruction titanium mesh and acetabular reconstruction bracket can meet the needs of acetabular acetabulum of different sizes. However, this patent is for the use of the entire acetabulum defect (that is, it is a replacement technology for the entire acetabulum, which requires the entire acetabulum to be destroyed and then reconstructed), and it is not suitable for the use of this technology for local posterior wall defects. Chinese patent application with application number 202011184480.3 discloses a method for constructing an individualized 3D printed acetabular wall defect repair and reconstruction system. Chinese patent application with application number 201921884497.2 discloses an embedded acetabular posterior wall reconstruction prosthesis based on 3D printing. Both are methods and devices proposed for the replacement of the entire acetabulum. For partial acetabular defects, it is not possible to simply reconstruct the defect, and the entire acetabulum often needs to be destroyed and then reconstructed.

[0005] With existing technology, the best treatment strategy for acetabular posterior wall defects is hip replacement. However, for young patients with posterior wall defects or even elderly patients with simple posterior wall defects without complications such as joint wear, hip replacement is not the best option.

[0006] In summary, there is an urgent need to design a prosthesis technology for reconstruction of the posterior wall defect of the acetabulum that can solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a system for reconstructing the defect of the posterior wall of the acetabulum to meet the needs of various reconstructions of the defect of the posterior wall of the acetabulum, and to solve the problem of fixation failure after internal fixation treatment or inappropriateness for internal fixation treatment in patients with severe posterior wall fractures of the acetabulum (the present invention is used in a first-stage operation to reconstruct the site of the posterior wall fracture block of the acetabulum to prevent subsequent internal fixation failure causing severe arthritis and hip replacement, and to reconstruct the posterior wall fracture defect in patients with posterior wall fractures whose internal fixation fails before the femoral head wears out), thereby improving the prognosis and quality of life of the patients.

[0008] The acetabular posterior wall defect reconstruction system described in the present invention is a universal patch prosthesis, and the patch prosthesis can also be customized by 3D printing according to the specific defect site, and connected with the specific defect site to meet the reconstruction needs of various acetabular posterior wall defects; the universal patch prosthesis model in the present invention includes but is not limited to six types (acetabular full posterior wall defect reconstruction prosthesis, acetabular posterior wall upper 2 / 3 reconstruction prosthesis, acetabular posterior wall lower 2 / 3 reconstruction prosthesis, acetabular posterior wall upper 1 / 3 reconstruction prosthesis, acetabular posterior wall middle 1 / 3 reconstruction prosthesis and acetabular posterior wall lower 1 / 3 reconstruction prosthesis), the universal patch prosthesis of the present invention can also be constructed according to the proportion of other posterior walls, and the specific construction structure depends on the actual application situation. The present invention is suitable for reconstruction of posterior wall defects of various sizes to replace the original acetabular replacement. The present invention is mainly described in detail with the above six types of patch prostheses, but is not limited to the above 6 models.

[0009] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: a system for reconstructing the defect of the posterior wall of the acetabulum, comprising various types of 3D-printed reconstruction prostheses and screws for the defect of the posterior wall of the acetabulum, wherein the shape of the reconstruction prosthesis is consistent with the outer edge of the acetabulum at the defect, and the thickness is consistent with the outer edge of the acetabulum at the defect, and various types of patch blocks are similar to the outer edge of the acetabulum at the defect, and the thickness is similar to the outer edge of the acetabulum. These types of patch blocks meet the defect of the posterior wall of the acetabulum and achieve the effect of filling the bone defect;

[0010] The joint surface ends of the reconstructed prosthesis are all arc-shaped structures, which fit perfectly with the surrounding normal joint surfaces to avoid gaps;

[0011] A plurality of screw holes are arranged on the main body of the reconstruction prosthesis. The present invention fixes the patch to the ilium by inserting screws, thereby supporting the patch and achieving a stable effect on the hip joint after surgery.

[0012] The opening directions of the multiple screw holes are different and all face the outside of the joint, so that the mechanical distribution of the screws on the main body is even, avoiding uneven force on the patch prosthesis and partial tilting; and the opening directions of the screw holes avoid the acetabular joint surface and face the outside of the joint, and the direction of inserting the screws is away from the hip joint to avoid the screws entering the joint; the main body surfaces of various types of acetabular patch prostheses in the present invention are covered with screw holes in different directions, and all types of acetabular patch prostheses can be fixed to the corresponding defective parts of the posterior wall of the acetabulum through acetabular screws, so as to achieve the filling and supporting effects of the defect and achieve the effect of immediate stability after surgery;

[0013] The screw passes through the screw hole to fix the reconstruction prosthesis in the defect of the posterior wall of the acetabulum.

[0014] Reconstructive prostheses include but are not limited to reconstruction prostheses for the entire posterior wall defect of the acetabulum, reconstruction prostheses for the upper 2 / 3 of the posterior wall of the acetabulum, reconstruction prostheses for the lower 2 / 3 of the posterior wall of the acetabulum, reconstruction prostheses for the upper 1 / 3 of the posterior wall of the acetabulum, reconstruction prostheses for the middle 1 / 3 of the posterior wall of the acetabulum and reconstruction prostheses for the lower 1 / 3 of the posterior wall of the acetabulum. Different types of patch prostheses can meet the reconstruction needs of posterior wall defects of different degrees of acetabulum.

[0015] Furthermore, the bottom of the screw hole on the reconstructed prosthesis is a bowl-shaped structure, which can better fit the nut and enhance the fixing effect of the screw.

[0016] Furthermore, the main body of the reconstruction prosthesis is a hollow mesh structure. The main body of all types of acetabular posterior wall defect reconstruction prostheses in the present invention adopts a hollow mesh structure, which can be used to fill ground autologous bone or artificial bone to facilitate the growth of normal bone in the future, so that the prosthesis and the surrounding normal bone form a whole, further strengthening the fixation effect.

[0017] Furthermore, the main body of the reconstructed prosthesis is sunken by 3mm compared with the acetabulum at the defect site (the thickness of the main body of the reconstructed prosthesis is similar to the defect site, and the main body of the reconstructed prosthesis is sunken by 3mm away from the acetabulum than the acetabulum at the defect site); the main bodies of all types of acetabular posterior wall defect reconstructed prostheses in the present invention are sunken by about 3mm compared with the surrounding normal bone, and the sunken space can be used for bone grafting or bone cement filling to further enhance the fixation effect, strengthen the stability of the patch, and achieve the effect of immediate stability after surgery.

[0018] Furthermore, the joint surface end of the reconstructed prosthesis is a smooth metal surface. The acetabular joint surface of all types of acetabular posterior wall defect reconstruction prostheses in the present invention is a smooth metal surface, and may also be lined with ceramic or polyethylene. The acetabular surface and the normal joint surface are guaranteed to be flat and smooth, preventing the movement of the hip joint in postoperative life from rubbing against the femoral head and causing irreversible consequences.

[0019] Furthermore, four screw holes are arranged on the main bodies of the acetabular full posterior wall defect reconstruction prosthesis, the acetabular posterior wall upper 2 / 3 reconstruction prosthesis, and the acetabular posterior wall lower 2 / 3 reconstruction prosthesis to form mechanical fixation in all directions;

[0020] Two screw holes are arranged on the main body of the upper 1 / 3 reconstruction prosthesis of the posterior acetabulum, the middle 1 / 3 reconstruction prosthesis of the posterior acetabulum, and the lower 1 / 3 reconstruction prosthesis of the posterior acetabulum to form mechanical fixation in all directions;

[0021] Different types of patch prosthesis bodies in the present invention have different numbers of screw holes, and the screw placement directions in the screw holes are also different, so that the mechanical distribution of the screws on the body is even, avoiding uneven force on the patch prosthesis and partial tilting.

[0022] Furthermore, the shape and thickness of the acetabular total posterior wall defect reconstruction prosthesis are consistent with the outer edge of the acetabulum at the total posterior wall defect, and multiple screws pass through the screw holes to fix the acetabular total posterior wall defect reconstruction prosthesis at the acetabular posterior wall defect;

[0023] The shape and thickness of the upper 2 / 3 reconstruction prosthesis of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the upper 2 / 3 of the posterior wall. Multiple screws are passed through the screw holes to fix the upper 2 / 3 reconstruction prosthesis of the posterior wall of the acetabulum at the defect of the upper 2 / 3 of the posterior wall of the acetabulum.

[0024] The shape and thickness of the reconstruction prosthesis of the lower 2 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the lower 2 / 3 of the posterior wall. Multiple screws pass through the screw holes to fix the reconstruction prosthesis of the lower 2 / 3 of the posterior wall of the acetabulum at the defect of the lower 2 / 3 of the posterior wall of the acetabulum.

[0025] Furthermore, the shape and thickness of the upper 1 / 3 reconstruction prosthesis of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the upper 1 / 3 of the posterior wall, and multiple screws are passed through the screw holes to fix the upper 1 / 3 reconstruction prosthesis of the posterior wall of the acetabulum at the defect of the upper 1 / 3 of the posterior wall of the acetabulum;

[0026] The shape and thickness of the reconstruction prosthesis of the 1 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the 1 / 3 of the posterior wall, and multiple screws are passed through the screw holes to fix the reconstruction prosthesis of the 1 / 3 of the posterior wall of the acetabulum at the defect of the 1 / 3 of the posterior wall of the acetabulum;

[0027] The shape and thickness of the reconstruction prosthesis of the lower 1 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the lower 1 / 3 of the posterior wall. Multiple screws pass through the screw holes to fix the reconstruction prosthesis of the lower 1 / 3 of the posterior wall of the acetabulum to the defect of the middle 1 / 3 of the posterior wall of the acetabulum.

[0028] The present invention has the following advantages:

[0029] (1) The acetabular posterior wall defect reconstruction prosthesis provided by the present invention is divided into multiple models. According to the specific size of the acetabular posterior wall defect, a suitable patch prosthesis can be selected at will or customized by 3D printing;

[0030] (2) The reconstruction prosthesis in the present invention is a universal patch prosthesis, which can be designed according to the corresponding actual anatomical structure of the posterior wall of the acetabulum, so that it is more closely attached to the surrounding bone surface, and the articular surface end of the reconstruction prosthesis is closely attached to the normal articular surface around the posterior wall of the acetabulum;

[0031] (3) The main body of the patch prosthesis of the present invention adopts a spatial hollow mesh structure and is sunken 3mm from the normal bone surface around the posterior wall of the acetabulum, which is convenient for intraoperative compression bone grafting or filling with bone cement, and ensures the long-term stability of the prosthesis and the surrounding bone after surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the main structure of the prosthesis for reconstruction of the total acetabulum posterior wall defect in the present invention.

[0033] Figure 2 It is a schematic diagram of the side view of the prosthesis for reconstruction of the total acetabulum posterior wall defect in the present invention.

[0034] Figure 3 This is a schematic diagram of the main structure of the prosthesis for reconstructing the upper 2 / 3 defect of the posterior wall of the acetabulum in the present invention.

[0035] Figure 4 It is a schematic diagram of the side view of the prosthesis for reconstructing the defect of the upper 2 / 3 of the posterior wall of the acetabulum in the present invention.

[0036] Figure 5 This is a schematic diagram of the main structure of the prosthesis for reconstructing the defect of the lower 2 / 3 of the posterior wall of the acetabulum in the present invention.

[0037] Figure 6 It is a schematic diagram of the side structure of the prosthesis for reconstructing the defect of the lower 2 / 3 of the posterior wall of the acetabulum in the present invention.

[0038] Figure 7 It is a schematic diagram of the main structure of the prosthesis for reconstructing the defect of the upper 1 / 3 of the posterior wall of the acetabulum in the present invention.

[0039] Figure 8 It is a schematic diagram of the side view of the prosthesis for reconstructing the defect of the upper 1 / 3 of the posterior wall of the acetabulum in the present invention.

[0040] Fig. 9 This is a schematic diagram of the main structure of the prosthesis for reconstructing the 1 / 3 defect in the posterior wall of the acetabulum in the present invention.

[0041] Fig.10 It is a schematic diagram of the side view of the prosthesis for reconstructing the 1 / 3 defect in the posterior wall of the acetabulum in the present invention.

[0042] Fig.11 It is a schematic diagram of the main structure of the prosthesis for reconstructing the defect of the lower 1 / 3 of the posterior wall of the acetabulum in the present invention.

[0043] Fig.12 It is a schematic diagram of the side view of the prosthesis for reconstructing the defect of the lower 1 / 3 of the posterior wall of the acetabulum in the present invention.

[0044] Figure 2 The main body of the middle patch prosthesis sinks 3mm below the surrounding normal bone.

[0045] Figure 4 In the experiment, the main body of the reconstructed prosthesis was 3 mm lower than the surrounding normal bone.

[0046] Figure 6 In the experiment, the main body of the reconstructed prosthesis was 3 mm lower than the surrounding normal bone.

[0047] Figure 8 In the experiment, the main body of the reconstructed prosthesis was 3 mm lower than the surrounding normal bone.

[0048] Fig.10 In the experiment, the main body of the reconstructed prosthesis was 3 mm lower than the surrounding normal bone.

[0049] Fig.12 In the experiment, the main body of the reconstructed prosthesis was 3 mm lower than the surrounding normal bone.

[0050] Figure 1-Figure 12 In the figure, A represents the posterior wall of the acetabulum.

[0051] In the figure, 1-reconstruction prosthesis, 1.1-reconstruction prosthesis for the entire posterior wall defect of the acetabulum, 1.2-reconstruction prosthesis for the upper 2 / 3 of the posterior wall of the acetabulum, 1.3-reconstruction prosthesis for the lower 2 / 3 of the posterior wall of the acetabulum, 1.4-reconstruction prosthesis for the upper 1 / 3 of the posterior wall of the acetabulum, 1.5-reconstruction prosthesis for the middle 1 / 3 of the posterior wall of the acetabulum, 1.6-reconstruction prosthesis for the lower 1 / 3 of the posterior wall of the acetabulum, 2-screw hole, 3-screw. DETAILED DESCRIPTION

[0052] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention are made clearer and easier to understand through the description.

[0053] like Figures 1 to 12 As shown, the acetabular posterior wall defect reconstruction system of the present invention includes but is not limited to a reconstruction prosthesis 1.1 for the entire posterior wall defect of the acetabulum, a reconstruction prosthesis 1.2 for the upper 2 / 3 of the posterior wall of the acetabulum, a reconstruction prosthesis 1.3 for the lower 2 / 3 of the posterior wall of the acetabulum, a reconstruction prosthesis 1.4 for the upper 1 / 3 of the posterior wall of the acetabulum, a reconstruction prosthesis 1.5 for the middle 1 / 3 of the posterior wall of the acetabulum, and a reconstruction prosthesis 1.6 for the lower 1 / 3 of the posterior wall of the acetabulum, which can meet various needs for reconstruction of the posterior wall defect of the acetabulum.

[0054] like Figures 1 to 12 The main bodies of various types of reconstruction prostheses in the present invention all adopt a hollow mesh structure, which can be used for compression bone grafting during surgery, which is conducive to normal bone growth into the prosthesis and closely combined with the prosthesis, thereby increasing the service life of the prosthesis.

[0055] like Figures 1 to 12The main bodies of various types of reconstruction prostheses in the present invention are all provided with screw holes, and the bottom of the screw holes is a bowl-shaped structure, which facilitates the combination of the nut and the screw hole (i.e., the acetabular screw) and strengthens the fixation of the screw. The directions of the screws in each screw hole avoid the acetabular joint surface to prevent the screws from entering the joint.

[0056] like Figures 1 to 12 The articular surface ends of various types of reconstruction prostheses in the present invention are all arc-shaped structures, which perfectly fit with the surrounding normal articular surfaces to avoid gaps.

[0057] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 As shown, each type of acetabular reconstruction prosthesis in the present invention has its main body sunken 3mm below the surrounding normal bone to compress the bone graft or fill bone cement, thereby further stabilizing and strengthening the fixation effect of the reconstruction prosthesis.

[0058] The reconstruction prosthesis 1 in the present invention (including but not limited to the reconstruction prosthesis for the complete defect of the posterior wall of the acetabulum, the reconstruction prosthesis for the defect of the upper 2 / 3 of the posterior wall of the acetabulum, the reconstruction prosthesis for the defect of the lower 2 / 3 of the posterior wall of the acetabulum, the reconstruction prosthesis for the defect of the upper 1 / 3 of the posterior wall of the acetabulum, the reconstruction prosthesis for the defect of the middle 1 / 3 of the posterior wall of the acetabulum and the reconstruction prosthesis for the defect of the lower 1 / 3 of the posterior wall of the acetabulum) is designed according to the degree of defect of the posterior wall of the acetabulum, and different types of reconstruction prostheses are designed and selected according to different degrees of defect to meet the needs of different posterior wall defects of the acetabulum, as follows:

[0059] (1) Figure 1 The acetabular posterior wall total defect reconstruction prosthesis shown is suitable for the total defect of the acetabular posterior wall, completely replacing the entire acetabular posterior wall, and achieving the function of supplementing the posterior wall defect. There are 4 screw holes on its surface, and the screw placement directions in each screw hole are also different, so that the mechanical distribution of the screws on the main body is even, avoiding uneven force on the reconstruction prosthesis and partial tilting;

[0060] (2) Figure 3 and Figure 5 The reconstruction prosthesis for defects of the upper 2 / 3 and lower 2 / 3 of the posterior wall of the acetabulum shown in the figure is respectively suitable for defects of the upper 2 / 3 and lower 2 / 3 of the posterior wall of the acetabulum, and has 4 screw holes on its surface, and the screw placement directions in each screw hole are also different, so that the mechanical distribution of the screws on the main body is even, avoiding uneven force on the reconstruction prosthesis and partial tilting;

[0061] (3) Figure 7 , Fig. 9 and Fig.11The reconstruction prosthesis for defects of the upper 1 / 3, middle 1 / 3 and lower 1 / 3 of the posterior wall of the acetabulum shown in the figure is respectively suitable for defects of the upper 1 / 3, middle 1 / 3 and lower 1 / 3 of the posterior wall of the acetabulum, and has two screw holes on its surface, and the screw placement directions in the screw holes are also different, so that the mechanical distribution of the screws on the main body is even, and the reconstruction prosthesis is prevented from being unevenly stressed and partially tilted;

[0062] The above-mentioned various types of reconstruction prostheses 1 are all flexibly used for different degrees of defects in the posterior wall of the acetabulum, to achieve the filling and supporting effects of the corresponding defects, to achieve the effect of immediate postoperative stability, and to meet the needs of different procedures of defects in the posterior wall of the acetabulum.

[0063] It should be further explained that the articular surface ends of various types of reconstruction prostheses in the present invention are smooth metal surfaces to reduce friction with the femoral head, and the articular surface ends can be changed to ceramic linings or polyethylene linings as needed.

[0064] In order to more clearly illustrate the advantages of the acetabular posterior wall defect reconstruction system of the present invention compared with the prior art, the staff compared the two technical solutions, and the comparison results are shown in the following table:

[0065]

[0066]

[0067] It can be seen from the above table that the acetabular posterior wall defect reconstruction system described in the present invention can solve the problem of fixation failure after internal fixation treatment for patients with severe acetabular posterior wall fractures compared with the prior art. It has good stability, can achieve immediate stability, and is small in size. In addition to several specific models and sizes prepared in advance (such as acetabular full posterior wall defect reconstruction prosthesis, acetabular posterior wall upper 2 / 3 reconstruction prosthesis, acetabular posterior wall lower 2 / 3 reconstruction prosthesis, acetabular posterior wall upper 1 / 3 reconstruction prosthesis, acetabular posterior wall middle 1 / 3 reconstruction prosthesis and acetabular posterior wall lower 1 / 3 reconstruction prosthesis), reconstruction prostheses of other models and sizes can also be printed through 3D printing technology to meet the needs of various acetabular posterior wall defect reconstruction. The reconstruction method is simple, fast and effective.

[0068] The above description is only a detailed explanation of the preferred embodiments and cannot be used to limit the present invention. Any ordinary technician in this field can make further improvements, modifications and equivalent substitutions without violating the technical principles of the invention. These improvements, modifications and equivalent substitutions should all fall within the scope of protection of the present invention.

[0069] Other parts not described belong to the prior art.

Claims

1. Acetabular posterior wall defect reconstruction system, characterized by: The invention comprises a reconstruction prosthesis (1) and a screw (3). The shape of the reconstruction prosthesis (1) is consistent with the outer edge of the acetabulum at the defect, and the thickness is consistent with the outer edge of the acetabulum at the defect. The joint surface ends of the reconstructed prosthesis (1) are all arc-shaped structures; A plurality of screw holes (2) are arranged on the reconstruction prosthesis (1), and the opening directions of the plurality of screw holes (2) are different and all face outside the joint; The screw (3) passes through the screw hole (2) to fix the reconstruction prosthesis (1) to the defect of the posterior wall of the acetabulum. The reconstructive prosthesis (1) includes but is not limited to a reconstructive prosthesis for the entire posterior wall defect of the acetabulum (1.1), a reconstructive prosthesis for the upper 2 / 3 of the posterior wall of the acetabulum (1.2), a reconstructive prosthesis for the lower 2 / 3 of the posterior wall of the acetabulum (1.3), a reconstructive prosthesis for the upper 1 / 3 of the posterior wall of the acetabulum (1.4), a reconstructive prosthesis for the middle 1 / 3 of the posterior wall of the acetabulum (1.5) and a reconstructive prosthesis for the lower 1 / 3 of the posterior wall of the acetabulum (1.6).

2. The acetabular posterior wall defect reconstruction system according to claim 1, characterized in that: The bottom of the screw hole (2) is a bowl-shaped structure.

3. The acetabular posterior wall defect reconstruction system according to claim 1 or 2, characterized in that: The main body of the reconstruction prosthesis (1) is a hollow mesh structure.

4. The acetabular posterior wall defect reconstruction system according to claim 3, characterized in that: The main body of the reconstructed prosthesis (1) was sunken 3 mm below the defective acetabulum.

5. The acetabular posterior wall defect reconstruction system according to claim 4, characterized in that: The joint surface end of the reconstruction prosthesis (1) is a smooth metal surface.

6. The acetabular posterior wall defect reconstruction system according to claim 5, characterized in that: Four screw holes (2) are arranged on the main bodies of the acetabular full posterior wall defect reconstruction prosthesis (1.1), the acetabular posterior wall upper 2 / 3 reconstruction prosthesis (1.2) and the acetabular posterior wall lower 2 / 3 reconstruction prosthesis (1.3); Two screw holes (2) are arranged on the main bodies of the upper 1 / 3 reconstruction prosthesis (1.4) of the posterior wall of the acetabulum, the middle 1 / 3 reconstruction prosthesis (1.5) of the posterior wall of the acetabulum, and the lower 1 / 3 reconstruction prosthesis (1.6) of the posterior wall of the acetabulum.

7. The acetabular posterior wall defect reconstruction system according to claim 6, characterized in that: The shape and thickness of the acetabular total posterior wall defect reconstruction prosthesis (1.1) are consistent with the outer edge of the acetabulum at the total posterior wall defect, and a plurality of screws (3) pass through the screw holes (2) to fix the acetabular total posterior wall defect reconstruction prosthesis (1.1) at the acetabular posterior wall defect; The shape and thickness of the upper 2 / 3 reconstruction prosthesis (1.2) of the acetabulum posterior wall are consistent with the outer edge of the acetabulum at the defect of the upper 2 / 3 of the acetabulum posterior wall, and a plurality of screws (3) pass through the screw holes (2) to fix the upper 2 / 3 reconstruction prosthesis (1.2) of the acetabulum posterior wall at the defect of the upper 2 / 3 of the acetabulum posterior wall; The shape and thickness of the reconstruction prosthesis (1.3) of the lower 2 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the lower 2 / 3 of the posterior wall. Multiple screws (3) pass through the screw holes (2) to fix the reconstruction prosthesis (1.3) of the lower 2 / 3 of the acetabulum at the defect of the lower 2 / 3 of the posterior wall of the acetabulum.

8. The acetabular posterior wall defect reconstruction system according to claim 6, characterized in that: The shape and thickness of the reconstruction prosthesis (1.4) of the upper 1 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the upper 1 / 3 of the posterior wall, and a plurality of screws (3) pass through the screw holes (2) to fix the reconstruction prosthesis (1.4) of the upper 1 / 3 of the posterior wall of the acetabulum at the defect of the upper 1 / 3 of the posterior wall of the acetabulum; The shape and thickness of the reconstruction prosthesis (1.5) of the posterior acetabulum wall are consistent with the outer edge of the acetabulum at the defect of the posterior acetabulum wall. A plurality of screws (3) pass through the screw holes (2) to fix the reconstruction prosthesis (1.5) of the posterior acetabulum wall at the defect of the posterior acetabulum wall. The shape and thickness of the reconstruction prosthesis (1.6) of the lower 1 / 3 of the posterior wall of the acetabulum are consistent with the outer edge of the acetabulum at the defect of the lower 1 / 3 of the posterior wall. Multiple screws (3) pass through the screw holes (2) to fix the reconstruction prosthesis (1.6) of the lower 1 / 3 of the posterior wall of the acetabulum at the defect of the middle 1 / 3 of the posterior wall of the acetabulum.

Images