Artificial femoral prosthesis

Abstract

The invention discloses an artificial femoral prosthesis, which consists of a femoral stem (1), bone grafts (2) and an outer sleeve (3). Particularly, the outer sleeve (3) is implanted into the medullary space of femora (4); a femoral stem far end (5) is inserted into an outer sleeve track (6); and the gap between the outer sleeve (3) and the femora (4) is filled with the bone grafts (2). The aimof the invention is that: through long term fusion of the femora (4) and the bone grafts (2), the artificial femoral prosthesi bears the stress from a femoral stem collar (7); through the annular design of the outer sleeve track (6), after the femoral stem collar (7) is stressed, inside displacement (8) is smaller than outside displacement (9), so that the stress outside the femora is larger; by controlling the contact position of the outer sleeve track (6) and the femoral stem far end (5), the stress of the femora (4) is distributed close to the natural state; through anatomy covering of thefemoral stem collar (7), grains are prevented from entering the bone-prosthesis joint surface; and by changing the shape size of the outer sleeve (3), the artificial femoral prosthesis adapts to different medullary spaces and indications.

Description

technical field [0001] The invention relates to a hip joint prosthesis, especially an artificial femoral prosthesis implanted in the femoral part. Background technique [0002] Artificial hip arthroplasty is widely used clinically and is currently the treatment for severe osteoarthritis, femoral neck intracapsular fracture, rheumatoid arthritis, advanced aseptic necrosis of the femoral head, advanced congenital acetabular dysplasia and acetabular deformity. and so on the most common method. It has many advantages such as relieving joint pain, restoring joint function, maintaining joint stability and not affecting or repairing the length of limbs. It has become an effective means of treating severe hip joint lesions. [0003] The existing technology of artificial hip joint prosthesis is usually to imitate the structure of the human hip joint, insert the prosthesis handle into the femoral medullary cavity, and use the head to rotate with the socket or the metal cup of the pro...

AI Technical Summary

Problems solved by technology

The femoral stem with a collar structure can effectively prevent the prosthesis from subsidence, avoid disuse osteoporosis on the osteotomy surface, and ensure the position of the center of rotation of the prosthesis, but the distal end of the stem is prone to loosening and swinging, which intensifies the stress on the stem The femoral stem with collarless structure can sink automatically after the prosthesis is implanted to ensure the tight fit between the prosthesis and the medullary cavity, which can effectively ensure the stability of the femoral stem after implantation. long-term stability, but disuse osteoporosis is prone to occur on the osteotomy surface, and excessive subsidence will lead to unequal lengths of the lower limbs

Images