Long-Term clinical results of patellofemoral arthroplasty for isolated patellofemoral osteoarthritis

ObjectivesThe aim of this study was to explore the clinical outcomes and long-term survival of patellofemoral arthroplasty in treatment of isolated patellofemoral osteoarthritis.MethodsWe retrospectively studied a total of 46 type Y-L-Q PFAs that were designed at our institution in 38 patients. Implant survivorship was analyzed with a follow-up of 18.9-29.6 years. Knee Society Score (KSS), Oxford Knee Score (OKS), and University of California Los Angeles activity scale (UCLA) were used to assess functional outcomes.ResultsThe implant survivorship was 83.6% at 15 years, 76.8% at 20 years, and 59.4% at 25 years 14 PFAs in 12 patients were revised into total knee arthroplasty at 16.0 +/- 6.7 years; 13 for progression of tibiofemoral osteoarthritis and one for polyethylene wear. The mean Knee Society Score objective scores and functional scores were 73.0 +/- 17.5 (range, 49-95) and 56.4 +/- 28.9 (range, 5-90), respectively. The mean Oxford Knee Score was 25.8 +/- 11.5 (range, 8-44).ConclusionType Y-L-Q patellofemoral arthroplasty can be an effective method for treating isolated patellofemoral osteoarthritis with satisfactory survival.

Automated summary

This study aimed to investigate the clinical outcomes and long-term survival of patellofemoral arthroplasty in treating isolated patellofemoral osteoarthritis. A total of 46 surgeries in 38 patients were retrospectively analyzed with a follow-up period of 18.9-29.6 years. The implant survivorship at 15 years, 20 years, and 25 years were 83.6%, 76.8%, and 59.4% respectively. The functional assessment showed a mean Knee Society Score of 73.0 and a mean Oxford Knee Score of 25.8.