Hip joint revision prosthesis

Abstract

The invention relates to a medical prosthesis, in particular to a hip joint revision prosthesis. The hip joint revision prosthesis comprises an acetabular cup, the acetabular cup is in a hemispherical shape, the acetabular cup is provided with first through holes, and the distance between any two adjacent first through holes is equal. Porous structures are designed or printed on the portions, making contact with the hip joint, of the hip joint revision prosthesis, and therefore prosthesis-bone interface bone ingrowth is achieved, and long-term stability of the prosthesis is achieved.

Description

technical field [0001] The invention relates to a medical prosthesis, in particular to a hip joint revision prosthesis. Background technique [0002] Total hip arthroplasty is one of the most successful operations in orthopedics since the 20th century. However, due to failure of infection, osteolysis and loosening after the first total hip replacement, another or multiple revision operations were required. [0003] Revision hip arthroplasty is more complicated than primary hip arthroplasty. First, the particles produced by the long-term wear and tear of the artificial hip joint can cause osteolysis around the prosthetic mass, thus forming a large-scale and complicated bone defect around the prosthetic mass; Bone cement is difficult, and irregular bone defects are easy to form; thirdly, infection around the artificial hip joint often results in complex shapes of infectious bone resorption and bone defects. [0004] Standardized acetabular pseudoblocks, reinforcing rings, a...

AI Technical Summary

Problems solved by technology

[0003] Revision hip arthroplasty is more complex than primary hip arthroplasty

First, the particles produced by the long-term wear and tear of the artificial hip joint can cause osteolysis around the prosthetic mass, thus forming a large-scale and complicated bone defect around the prosthetic mass; Bone cement is difficult, and it is easy to form irregular bone defects; third, for infection around the artificial hip joint, it often causes infectious bone resorption and bone defects with complex shapes.

[0004] Standardized acetabular pseudoblocks, reinforcing rings, autoblock or allogeneic bone grafts, bone cement filling, etc. can solve conventional hip revisions, but for hip revisions with large-scale and complex bone defects, the above methods cannot Resolved or poorly cured

The reasons are as follows: 1. Simply using bone cement to fill complex and huge bone defects, because the heat generated by bone cement can cause necrosis and absorption of the surrounding bone, and there is a bone-cement interface between the bone cement and the surrounding bone, the long-term effect is not ideal; 2. Compression bone grafting is also often used to fill complex bone defects. However, due to the need for absorption and reconstruction of the grafted bone, the early mechanical strength is not good, and the displacement of the pseudo-block occurs due to the change of mechanical strength during the process of absorption and reconstruction; 3. Structural bone grafting The mechanical strength is better than that of the granular bone graft at the early stage, but in the process of gradual bone resorption and crawling replacement, the mechanical strength gradually decreases, which may cause displacement and loosening of the pseudo-block; 4. The reinforcing ring can strengthen the hip joint particles, bone blocks or other structures. The firmness increases the fixed stability of the main part of the acetabular cup, but it may not fully meet the biomechanical requirements of the hip joint movement, and the reinforcing ring structure is mostly standardized accessories, which cannot guarantee a complete match with the patient's hip joint

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