Total knee prosthesis - has femoral component able to rotate freely in relation to cylindrical rod in vertical sleeve by means of bearing rollers

摘要

The prosthesis consists of a femoral component with a transverse axis, able to rotate freely relative to a vertical cylindrical rod (5) inside a sleeve (6) to permit flexion and rotation movements. The femoral component presses via condyle lugs against a base (2b) on a tibial component through a polyethylene plate (9) which is able to perform a limited angular movement in the horizontal plane relative to the base. The transverse axis is able to rotate inside a sleeve (4) which is joined to the vertical sleeve (6), e.g. by means of needle bearing rollers (7). In addition, the sleeve (4) is equipped with a stop (4a) which interacts with a projection (1b) when the femoral element is in its flexion position. ADVANTAGE - Improved joint movement.