Artificial knee joint bone fusion prosthesis

Abstract

The invention relates to an artificial knee joint bone fusion prosthesis. The artificial knee joint bone fusion prosthesis comprises a femur condyle prosthesis, a tibia platform prosthesis and a joint pad, wherein the femur condyle prosthesis comprises a joint surface, a condyle combination surface, a intercondylar combination surface, a positioning body, a femur intramedullary stem and a femur intramedullary extending stem; the tibia platform prosthesis comprises a platform body, a tibia combination surface, a wing plate or a positioning body, a tibia intramedullary stem and a tibia intramedullary extending stem; the femur intramedullary stem, the femur intramedullary extending stem, the tibia intramedullary stem and the tibia intramedullary extending stem are hollow, the surfaces of the intramedullary stems and the extending stems have porous or mesh structure so as to ensure that the hollow parts in the stem body can be communicated with the external part; when in use, autograft or allograft crushed bone particles are filled in the hollow parts of the intramedullary stems and the intramedullary extending stems, and after the external bone tissue fuses and grows together with the crushed bone particles filled in the intramedullary stems, the overall elastic modulus can be very close to that of the human bone, thus reaching the aim of effectively preventing the loose between the artificial knee joint bone fusion prosthesis and the sclerotin for long time.

Description

technical field [0001] The invention relates to an artificial knee joint bone fusion prosthesis. Background technique [0002] Artificial knee replacement surgery has become a relatively common surgical operation in the medical field. The implant of the artificial knee joint usually consists of a femoral condyle prosthesis, a tibial plateau prosthesis, and a joint liner made of ultra-high molecular weight polyethylene. In the past, the femoral condyle prosthesis and the tibial plateau prosthesis were bonded to the femoral end and the tibial end respectively with bone cement. After the operation, the friction surface of the joint prosthesis will gradually produce tiny debris. Osteolysin produced after microparticles are phagocytized by macrophages will promote bone dissolution around the prosthesis over time, eventually leading to loosening of the prosthesis. The biological prosthesis produced in recent years uses methods such as micropores and bioceramic coatings to form an...

AI Technical Summary

Problems solved by technology

[0002] Artificial knee replacement surgery has become a relatively common surgical operation in the medical field. The implant of the artificial knee joint usually consists of a femoral condyle prosthesis, a tibial plateau prosthesis, and a joint liner made of ultra-high molecular weight polyethylene. In the past, the femoral condyle prosthesis and the tibial plateau prosthesis were bonded to the femoral end and the tibial end respectively with bone cement. After the operation, the friction surface of the joint prosthesis will gradually produce tiny debris. Osteolysin produced after microparticles are phagocytized by macrophages will promote bone dissolution around the prosthesis over time, eventually leading to loosening of the prosthesis

The biological prosthesis produced in recent years uses methods such as micropores and bioceramic coatings to form an ingrowth combination between the prosthesis and the bone contact surface in order to obtain more long-term stability. However, due to the femoral condyle prosthesis and the tibial plateau The materials used in the prosthesis are mostly stainless steel, titanium alloy, cobalt alloy and biological ceramics. Their common defect is that the elastic modulus is too high, such as 110-120GPa for titanium alloy, and as high as 200GPa for stainless steel and cobalt alloy; The elastic modulus of bone and cancellous bone is only about 15GPa and 1.5GPa respectively, and the elastic modulus of metal materials or ceramic materials is more than ten times or even dozens of times that of bone tissue. The mechanical properties of implants made of the above materials Can't match with bone tissue, high elastic modulus will make the bone tissue around the implant prosthesis bear too little load and cause bone resorption, bone atrophy and disuse osteoporosis, and eventually lead to prosthesis loosening

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