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The Bone & Joint Journal

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The Journal of Bone & Joint Surgery British Volume
Vol. 74-B, Issue 1 | Pages 18 - 22
1 Jan 1992
Jones S Pinder I Moran C Malcolm A

Isolated wear of the polyethylene tibial component led to failure in five of a series of 108 uncemented porous-coated knee replacements. The clinical features included pain, effusion and instability with progressive varus deformity. In all cases there was extensive wear on the medial side of the polyethylene surface of the prosthesis. The mechanism of such wear is complex, being due in part to the unconstrained nature of the joint and the incongruity of its surfaces. Other design characteristics may have contributed.