Patella component loosening--A case report.

Patellofemoral arthroplasty is a treatment option for the relatively young patient with isolated patellofemoral osteoarthritis where conservative treatment has failed. However, despite of reasonable long term results, complications could be challenging. Loosening of the polyethylene patella component is a serious complication and has been reported in 2%. Dislocation of the polyethylene patella component did -happen more often in the polyethylene patella metal backed LCS-PFA variant. In this case we describe the diagnostic and treatment challenges of this complication.