Tantalum metal bone trabecula femoral condyle prosthesis and knee joint replacement body

Abstract

The invention relates to a tantalum metal bone trabecula femoral condyle prosthesis and a knee joint replacement body. The femoral condyle prosthesis comprises a cobalt-chromium-molybdenum substrate and a porous tantalum metal bone trabecula inner shell welded into the cobalt-chromium-molybdenum substrate, the knee joint prosthesis comprises the femoral condyle prosthesis and further comprises a femoral marrow needle, a tibial plateau pad, a tibial plateau support and a tibial marrow needle, the femoral marrow needle and the femoral condyle prosthesis are connected through a first taper locking mechanism, the tibial marrow needle and the tibial plateau support are connected through a second taper locking mechanism, the upper end face of the tibial plateau support and the lower end face of the tibial plateau pad are both planes, and a rotary limiting hole is formed in the upper end face of the tibial plateau support; and the lower end face of the tibial plateau pad is provided with a rotary limiting column corresponding to the rotary limiting hole, and the rotary limiting column is arranged in the rotary limiting hole. The femoral condyle prosthesis has the beneficial effects that a wide bone ingrowth space can be provided, stress shielding can be reduced, chemical erosion can be resisted, and the risk of prosthesis loosening and dislocation can be effectively reduced.

Description

technical field [0001] The present application relates to the technical field of artificial joints, in particular to a tantalum metal trabecular femoral condyle prosthesis and a knee joint replacement. Background technique [0002] Rheumatoid arthritis, osteoarthritis, traumatic arthritis, and polyarthritis have bone defects and joint instability. Knee replacement surgery often uses knee replacements to restore the normal physiological movement of the knee joint. At present, this kind of knee joint prosthesis has been widely used in joint replacement surgery. However, there are still many unstable factors in the knee joint replacement body of the related art. The existing knee replacement body still has defects in structure and use, and cannot achieve the best use effect, and its shortcomings can be summarized as follows: [0003] 1. The traditional femoral condyle prosthesis for knee joint replacement is made of cobalt chromium molybdenum, and its outer surface is highly ...

AI Technical Summary

Problems solved by technology

However, there are still many unstable factors in the knee joint replacement body of the related art.

The existing knee replacement body still has defects in structure and use, and cannot achieve the best use effect, and its shortcomings can be summarized as follows:

[0003] 1. The traditional femoral condyle prosthesis for knee joint replacement is made of cobalt chromium molybdenum, and its outer surface is highly polished, which cannot effectively facilitate bone ingrowth, provide a high friction coefficient, and have an elastic modulus close to that of cancellous bone. Reduce stress shielding, etc.

[0004] 2. The polyethylene tibial plateau pad and tibial plateau support of the knee joint replacement have a snap-lock mechanism, and the connection cannot be absolutely firm. At the same time, the tibial plateau support is not a high-polished surface, so the two will produce micro-motion during the knee joint movement, resulting in Polyethylene Tibial Plateau Subsurface Wear

[0005] 3. The knee arthroplasty of the prior art cannot realize the physiological internal and external rotation angles of the normal knee joint flexion. At the same time, the joint contact surface of the femoral condyle and the tibial plateau pad is in the form of a circle to a shallow concave surface, which limits the height between the joints. match, resulting in locally high stress

However, other concerns persist, as increased prosthetic confinement increases stress transmitted to the prosthesis-cement or cement-bone interface, leading to aseptic loosening and early failure of the prosthesis

[0007] The knee arthroplasty of the related art still has the contradiction between low contact stress and free rotation, and cannot realize the physiological internal and external rotation angles of the normal knee joint flexion. At the same time, the joint contact surface of the femoral condyle and the tibial plateau pad is a circular to shallow concave surface The contact mode limits the high matching between joints, resulting in local high stress

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