Metallic discs which are surgically slotted in between the femur and the tibia, to adjust the contact surfaces and the forces through the joint. These are really not mainstream, although they are being used and evaluated in long-term studies.



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The first interpositional disc on the market - the earlier results highlighted several problems, including problems of sudden migration (dislocation) of the disc.



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A more stable implant with a posterior lip, which minimises movement. This disc has been designed for the medial side of the joint only.