Meniscal bearing dislocation of unicompartmental knee arthro
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Meniscal bearing type of knee prosthesis was designed to reduce contact stress between the femoral component and the bearing because the meniscal bearing automatically realigns the femorotibial relationship and functions as “check valve” for the excessive rotational force between both components. On the contrary, excess mobility due to thinner bearing selection in surgery, “wear-out” of polyethylene for many years of use, or ligament deterioration may lead to dislocation of the bearing. Dislocation of the bearing promptly requires reposition because it may lead to metallosis and polyethylene wear. Dislocation of the bearing in total knee arthroplasty (TKA) is well documented.

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