Arthroscopically-assisted retrieval of a fractured polyethylene Oxford knee meniscal bearing: a case report

Fracture of a polyethylene insert in a knee prosthesis is an uncommon but severe complication resulting in an unstable and malfunctioning knee that requires revision surgery. The aim of this paper was to present our experience with a minimally-invasive option for retrieving a posteriorly-migrated fragment of a mobile tibial bearing, which is a rare complication. We describe the management of a case of breakage of an Oxford knee medial bearing. Half of the mobile bearing was retrieved from the suprapatellar recess, while the other half had migrated posteriorly to the femoral condyle and was retrieved through an arthroscopically-assisted approach with the help of a posteromedial port. At the follow-up, no further complaints were reported by the patient, and activities of daily living were possible without pain or limitations. This report of a breakage of the mobile bearing following Oxford knee medial prosthesis placement demonstrates that in the event of breakage of the bearing, an arthroscopically-assisted approach is safe in the removal of the bearing and allows its replacement.