| 摘要 |
<p>Provided is an artificial knee joint capable of controlling the rotation of the knee joint according to the bend angle while also maintaining high stability in the antero-posterior direction. The artificial knee joint is provided with a femoral component that is fixed to the distal end of the femur, and a tibial plate that is fixed to the proximal end of the tibia and slidably accepts the femoral component. The femoral component has a medial condyle and lateral condyle. An opening and an elliptical sliding part, which connects the posterior ends of the medical condyle and lateral condyle and slides on the tibial plate when the knee is bent, are formed between the medial condyle and lateral condyle. The tibial plate is provided with a medial fossa that accepts the medial condyle and a lateral fossa that accepts the lateral condyle. Between the medial fossa and lateral fossa, a spine, which moves in the opening in the antero-posterior direction according to the flexing and extending motions of the knee and which contacts the elliptical sliding part during knee flexion, and a concave sliding surface, which configures the posterior surface of the spine and slidably accepts the elliptical sliding part, are formed. The width of the elliptical sliding part widens continuously from the opening to the posterior end.</p> |
