Tibia pad and total knee joint prosthesis

Abstract

The invention provides a tibia liner and a total knee joint prosthesis, the tibia liner comprises an inner side liner and an outer side liner, the inner side liner is used for being matched with an inner side condyle, and the outer side liner is used for being matched with an outer side condyle; a section line formed by intersection of the articular surface and the sagittal plane of the inner side liner comprises a first section arc and a second section arc which are connected, the second section arc is located on the rear side of the first section arc, the sagittal radius of the first section arc is smaller than that of the second section arc, the first section arc comprises a functional area, and the functional area is used for making contact with the inner side condyle during translation and rolling of the femoral prosthesis. According to the tibia liner, the height of the rearmost side of the inner side liner is effectively reduced, the knee joint prosthesis stably rotates with the inner side as the center, abrasion of the knee joint prosthesis can be reduced, the situation that the rearmost side of the inner side liner affects further backward rolling of the inner side condyle under high-flexion movement of the knee joint prosthesis can be avoided, and the knee joint prosthesis can be protected from being damaged. And the high buckling performance of the knee joint prosthesis is improved.

Description

technical field [0001] The invention relates to the field of orthopedic internal implants, in particular to a tibial liner and a total knee joint prosthesis. Background technique [0002] Knee replacement uses artificial knee prosthesis to replace diseased articular cartilage and meniscus while retaining normal joint ligaments and other tissues, which has the advantages of less trauma, faster recovery, less pain, and a more natural range of motion. Therefore, the knee joint Arthroplasty is widely used in knee joint treatment. [0003] During the flexion process of the normal human knee joint from -5° (extended position) to 120° (bent position), the medial femoral condyle 1 will experience about 1.5mm of front and rear translation (such as figure 1 shown), the lateral femoral condyle 2 will experience an anterior-posterior translation of approximately 18 mm. This movement makes the femur externally rotate about the medial condyle relative to the tibia during the flexion pro...

AI Technical Summary

Problems solved by technology

[0004] In the previous bionic total knee joint design, the medial tibial liner is usually designed as a complete ball-socket or approximate ball-socket shape with a single radius, which has the advantage of providing medial stability under all movements and ensuring that the knee joint rotates around the medial center , but under high flexion (such as squat) movement of the human body, this single-radius design will cause the medial femoral condyle prosthesis to be restricted by the higher posterior side of the medial tibial pad, so that the femoral prosthesis cannot roll back further, thus affecting High buckling performance of the prosthesis

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