Association of surgeon factors with outcome scores after total knee arthroplasty.

PURPOSE To identify preoperative factors (including surgeon factors) associated with outcome scores after total knee arthroplasty (TKA). METHODS Medical records of 2848 patients (3458 knees) who underwent primary TKA by 27 orthopaedic specialists were retrieved. Three specialty knee surgeons who had one-year fellowship in TKA performed 1930 TKAs, and 24 general orthopaedic surgeons performed 1528 TKAs. Four of them (including all 3 specialty knee surgeons) were ultrahigh- volume (≥ 100 TKAs a year), and 21 of them were senior consultants (≥ 5 years post residency). At 2 years, 2922 (85%) of knees had complete followup data. Oxford Knee Score, Knee Society knee and function scores, and SF-36 quality-of-life score were assessed by independent physiotherapists before and after surgery. Outcomes were compared in terms of dichotomised specialty, seniority, and surgical volume of surgeons. RESULTS Comparing ultra-high-volume (≥ 100 TKAs per year) specialty knee surgeons with general orthopaedic surgeons, the former achieved better outcomes in terms of the Oxford Knee Score at 6 months, Knee Society knee and function scores at 2 years, and SF-36 scores at 6 months and 2 years. Comparing lower-volume (<100 TKAs per year) specialty knee surgeons with general orthopaedic surgeons, the former still achieved better outcome and quality-of-life scores, except for SF-36 Mental Component Score at 2 years. CONCLUSION Specialty training and clinical research in TKA improved outcome and quality-of-life scores.