Rotatable axially restriction type hinge knee joint assembly

Abstract

The invention relates to the field of medical apparatus and instruments, and especially relates to a rotatable axially restriction type hinge knee joint assembly. The assembly includes a tibial plateau prosthesis, a tibial plateau pad disposed on the tibial plateau prosthesis, a femoral condyle prosthesis disposed above the tibial plateau pad, and a hinge structure connecting the tibial plateau prosthesis, the tibial plateau pad, and the femoral condyle prosthesis. The assembly achieves a flexion and extension function of a knee joint prosthesis through a hinge type design, and can bear 90% ofa load of tibia condyle; combination of design of each of parts is precise, and the knee joint assembly is strong in stability, can maintain the stability without relying on collateral ligaments, andis suitable for severe damage conditions of a knee joint such as absence of the collateral ligaments; and in addition, the hinge is designed in a split type, and so, the operability during operationis enhanced, at the same time, the assembly can be connected with various types of extension rods and cushion blocks to solve the bony defect problem.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a rotatable axially limited hinge knee joint assembly. Background technique [0002] In the clinical application of knee prosthesis, it cannot effectively deal with the following more complex clinical problems: [0003] (1) moderate to severe knee instability; [0004] (2) large bony defect including collateral ligament; [0005] (3) Simultaneous rupture of the medial and lateral collateral ligaments; [0006] (4) comminuted fracture of the distal femur in the elderly; [0007] (5) Bone fusion knee joint that cannot perform gap balance; [0008] (6) Tumors, trauma, rheumatoid arthritis, osteoarthritis, traumatic arthritis, polyarthritis, collagen diseases caused by massive defects or ligament defects; [0009] (7) Femoral condyle with ischemic necrosis, valgus, varus or flexion deformity; [0010] Conventional knee prostheses deal with the above problems, because the original...

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Problems solved by technology

[0005] (3) Simultaneous rupture of the medial and lateral collateral ligaments;

[0007] (5) Bone fusion knee joint that cannot perform gap balance;

[0010] Conventional knee prostheses deal with the above problems, because the original structure of the knee joint is severely damaged, especially the collateral ligaments may be missing, and the prosthesis cannot fully withstand the double shear force generated during the knee joint flexion and extension after installation, making There is a risk of dislocation of the knee prosthesis. Once the dislocation of the knee prosthesis occurs, it needs to be repaired again, causing great pain to the patient

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