A prosthesis including a tibial implant (3) and a femoral implant (4), the former being pivotable relative to the latter both about a substantially horizontal axis to allow the leg to bend and straighten, and about a vertical axis allowing limited pivoting of the tibia about its own axis, and consisting of an axially slidable projection (8) arranged in a bore which provides a bearing therefor. The vertical axis (A) about which the tibial implant (3) pivots is inwardly and forwardly offset relative to the horizontal axis about which said implant (3) pivots when the leg bends and straightens.
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