A case of aseptic loosening after total knee replacement with porous-coated mega prosthesis despite progression of extra bone growth

Abstract

Total knee replacement with mega prosthesis for periprosthetic fractures after total knee arthroplasty is related to early functional recovery, but aseptic loosening of the implant has been a major reoperation factor in the long-term outcome of total knee replacement with mega prosthesis. Extracortical bone formation caused by bone-collar interface osteointegration may decrease the probability of aseptic loosening by promoting bone formation and improving bone-implant fixation. Here, we report a case of total knee replacement using mega prosthesis with porous-coated collar showing extra bone growth without osteointegration of prosthesis and leading to aseptic loosening.

Keywords

• Megaprosthesis
• Extracortical bone growth
• Radio lucent line
• Aseptic loosening