Stabilised mobile bearing knee

Claim 1

A prosthesis for total knee replacement (TKR) which comprises: (a) a femoral component having a pair of condylar bearing surfaces, (b) a tibial component having a tibial platform and an upstanding stabilizing post fixed to the platform and located between the condylar-bearing surfaces, and (c) a meniscal component interposed between the condylar bearing surface and the tibial platform for sliding movement on the tibial platform in the anterior-posterior (A-P) direction, said meniscal component having an aperture therethrough and said post extending through said aperture, said femoral component having an intercondylar projecting surface which bridges said condylar surfaces and is adapted to contact the post at high degrees of flexion so as to influence the sliding movement of the meniscal component in a posterior direction, and wherein the aperture in the meniscal component is elongated in the A-P direction and cooperates with said post for guiding sliding movement of the meniscal component in the A-P direction, wherein the stabilizing post is spaced from the intercondylar projecting surface at low flexion and contacts said surface only at high degrees of flexion.