A femoral prosthesis construction system adaptable to different types of femoral deformities and defects

Abstract

The invention discloses a femur prosthesis assembly system suitable for different types of femur malformation and defects. The system comprises a femoral condyle prosthesis, an extension shank prosthesis and an assembled metal wedge-shaped cushion block, wherein the femoral condyle prosthesis comprises a joint surface, condyle bonding surfaces, a femur marrow inner shank and an intercondylar bonding surface; the joint surface and the condyle bonding surfaces adopt an integral structure; the intercondylar bonding surface is arranged between the condyle bonding surfaces; the femur marrow inner shank is arranged in the intercondylar bonding surface; the metal wedge-shaped cushion block comprises a femur rear condyle cushion block and a distal femoral cushion block which are both matched with the condyle bonding surfaces; the upper end of the extension shank prosthesis extends into the femur marrow inner shank for connection and fixation. Due to the femoral condyle prosthesis, the assembled metal wedge-shaped cushion block and the extension shank prosthesis, the parts of the system can be assembled into various types of prostheses in an operation, so as to meet the custom-made prosthesis requirements of patients with various bone defects, and to ensure precise combination and ideal healing effect.

Description

technical field [0001] The invention belongs to the technical field of medical device design, and in particular relates to a femoral prosthesis assembly system adapting to different types of femoral deformities and defects. Background technique [0002] Currently, bone defects on the femoral side can be caused by a number of causes, including: angular knee valgus deformity due to arthritis, avascular necrosis, trauma, femoral condyle dysplasia, and knee revision surgery. In revision knee arthroplasty, significant bone defects are often encountered, and the extent of the defect is often greater than preoperative imaging assessment. [0003] Bone defects on the femoral side are divided into three types according to the defect site: cavity defect and segmental defect; [0004] In the prior art, the bone defect existing on the femoral side can be solved by the following methods: [0005] 1. Bone cement filling: Bone cement filling is suitable for bone defects with a cavity def...

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Problems solved by technology

[0006] 2. Bone graft (autologous bone or allogeneic bone): bone graft (autologous bone or allogeneic bone) is suitable for hollow bone defects between 5-10mm, especially for young patients; but autologous bone materials are limited , and the safety of allograft bone, bone remodeling and integration ability are poor, resulting in failure of bone grafting;

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