Patients Have Acceptable Patient-Reported Outcome Measures After Medial Unicompartmental Knee Arthroplasty Regardless of Age

Contemporary evidence-based indications no longer consider age regarding eligibility for medial unicompartmental knee arthroplasty (mUKA). This has led to more surgical candidates; however, whether patients still have satisfactory outcomes lacks evidence. This study examined the association between age and change in patient-reported outcome measures after mUKA as well as the achievement of patient acceptable symptom state (PASS) and minimal important change (MIC). We included 782 mUKAs performed between February 1, 2016, and April 26, 2023. The mean change from preoperative Oxford knee score (OKS), forgotten joint score (FJS), and activity and participation questionnaire (APQ) was assessed at 3, 12, and 24 months after surgery, respectively. The achievement of 12-month PASS (OKS ≥ 30) and MIC (changes in OKS ≥ 8; FJS ≥ 14) was also assessed. Patients were divided into the following age groups: