Patients with anteromedial osteoarthritis achieve the greatest improvement in patient reported outcome after total knee arthroplasty.

Abstract

472 patients with pre- and 1-year postoperative patient reported outcome measures (PROMs) undergoing TKA surgery were retrospectively identified and classification of the OA disease pattern was made on preoperative radiographs. Measured resection was the universal technical approach. The key findings showed greater improvement in mean PROMs for anteromedial OA (AMOA) compared with other OA disease patterns; 3.1 points (95% CI 1.4-4.7, p < 0.001) in Oxford Knee score, 11.7 points (95% CI 0.9-22.5, p = 0.034) in Forgotten Joint score and 0.08 points (95% CI 0.02-0.14, p = 0.007) in EQ5D score. Similar results were observed when comparing AMOA with AMOA that had only partial thickness cartilage loss (AMOA-PTCL). Patients with AMOA achieve greater improvement in PROMs after TKA surgery when using measured resection compared with other OA disease patterns. This finding has important implications for reporting, risk stratification and interpretation in TKA outcome studies, including randomized trials, why further investigation of the topic is of highly relevance.