Is possible to just replace the kneecap in an operation called a patellofemoral replacement — also known as a patellofemoral joint arthroplasty — you can receive this surgery instead of total knee replacement surgery to recover in a faster time compared to traditional surgical methods. This procedure is not suitable for some patients with osteoarthritis because the long-term results are still not entirely known. A patellofemoral replacement involves the cartilage and damaged bone being resurfaced with metal or plastic replacements. This partial knee replacement only removes a section of the knee, leaving the healthy region in tact.