Unicompartmental knee arthroplasty improves mental health in patients with single compartment knee osteoarthritis

Purpose The purpose of this study was to determine if preoperative mental health status improves following unicompartmental knee arthroplasty (UKA) in patients with single compartment knee osteoarthritis (OA). Methods A total of 163 patients underwent UKA [115 (71%) medial, 48 (29%) lateral] (mean age = 65 ± 11) completed preoperative and minimum 2‐year postoperative veterans RAND 12 item health survey (VR‐12) mental component score (MCS). VR‐12 MCS was the primary outcome measure. Secondary measures included VR‐12 physical component summary score (PCS), knee osteoarthritis outcome score (KOOS) and KOOS patient acceptable symptom state at the final follow‐up. Results The median VR‐12 MCS improved from 50.5 [interquartile range (IQR): 43.7−56.8] to 55.0 [IQR: 52.3−57.0] (p