Patellofemoral Arthroplasty Designs and Osteoarthritis Progression Overview This study aimed to evaluate clinical and functional outcomes, complication rates, implant survivorship, and the progression of tibiofemoral osteoarthritis (OA) in patients with isolated patellofemoral OA undergoing new inlay or onlay patellofemoral arthroplasty (PFA). The research also sought to compare different implant types and models