TOTAL KNEE PROSTHESIS COMPRISING HINGE WITH AUTOMATIC WEAR TAKE-UP

摘要

The invention concerns a total knee prosthesis, comprising a femoral component (1) articulated by a hinge (2) about a transversal pin (3) on a tibial component (4) provided with a plate (5) arranged on a bone anchoring support (6), said plate being shaped so as to form for the femoral component a stop element in extension and contact bearings (27) for the rotary ends (11) of the hinge integral with the femoral component; the tibial plate is mounted with a slight antero-posterior clearance (j) relative to the support (6). As the surfaces of the bearings (27) of the plate (5) wear off, the latter can move gradually owing to the slight clearance with which it is provided, and thus be automatically realigned. The invention greatly reduces the wear of the plate (5) and considerably increases the life span of the prosthesis.