“…Common complications after UKA, which have been described, include aseptic loosening [1, 4, 8, 12, 14], infection [3], patellofemoral pain [7], polyethylene wear [6, 25] and progressive arthritic changes in the unreplaced compartments [1, 4, 8, 12, 14]. Complications specifically related to the extrusion of cement after UKA are not well documented, although there are a few reports concerning complications of cement extrusion associated with total knee arthroplasty [19, 24]. Here, we report on a case in which the extrusion of bone cement into the posteromedial compartment caused continuous pain, a clicking sensation and restriction of knee movement after UKA.…”