| 摘要 |
<p>The inventive prosthetic system for knee comprises a set of femoral implants (11-14) having respective increasing sizes. Each femoral implant comprises two condyles (4a, 4b) and a front flange (5). Each condyle comprises flat rear and distal surfaces (8a, 8b, 10a, 10b) for contacting with a femur, a flat rear chamfer (9a, 9b) for contacting with the femur, an articular surface (13a, 13b), the front flange (5) provided with flat front chamfer (11) and a flat front surface (12) for contacting with the femur. The orientation ( beta 1) of each flat front surface, the orientation and length ( beta 2, L2) of each flat rear chamfer, the orientation and length ( beta 3, L3) of each flat distal surface and the orientation ( beta 4) of the front flat chamfer are identical for all femoral implants of the set on the sagittal plane. The length (L4) of the front chamfer on the sagittal plane increases together with the size of all femoral implants. Said prosthetic system is characterised in that a radius of curvature (RO, RO12, RO34) on the sagittal plane of the distal part of the articular surface of each condyle increases together with the size of at least two femoral implants (12-13) of the set. The invention also relates to a postero-stabilised knee prosthesis comprising femoral and tibia implants and in which, a cam (26) of the femoral implant contacts a tibia implant block (25) when a knee is flexed, the articular surfaces of the femoral and tibia implant being still congruent on the sagittal plane.</p> |
