Abstract
Only a few cases of a clinically significant pigmented villonodular synovitis-like lesion (PVS-like lesion) following total knee replacement (TKR) have been reported. Here we describe a woman with osteonecrosis of the medial femoral condyle of the right knee, in whom a PVS-like lesion developed after TKR of the involved knee. The type of artificial knee used was a Yamamoto Mark II. Seven years after the knee replacement, her varus deformity appeared and X-rays revealed progressive osteolytic change in the medial tibial portion, necessitating re-operation with a cemented Omnifit type prosthesis. Pathological findings of the resected synovia, which was totally black in color, were consistent with those of PVS. Ten months have passed since the second operation, and the prosthesis has remained stable thus far.
