Orthopedics & Traumatology · Mar 25, 2026
Patient-reported outcomes after UKA in older patients with comorbidities
By 酒井 鴻, 赤崎 幸, 濵井 敏 et al.
OBJECTIVE: UKA is less surgically invasive and is readily indicated for older patients with multiple comorbidities. However, few studies have evaluated age and comorbidities jointly. This study examined patient-reported outcomes after UKA by considering age and comorbidities jointly. METHODS: The study included 175 knees that underwent UKA. Comorbidities were assessed using the Rheumatic Diseases Comorbidity Index (hereafter RDCI). Based on age and individual comorbidity scores, the knees were divided into 4 groups using hierarchical cluster analysis, and Knee Society Score (hereafter KSS), Forgotten Joint Score (hereafter FJS), and EQ-5D were compared at 1–2 years postoperatively. RESULTS: Among the included cases, the group with older age (mean age 81.7 years) and high RDCI scores had significantly lower KSS standing and walking, standard activities, and advanced activities scores than the other 3 groups. No significant differences in FJS or EQ-5D were observed among any of the groups. RESULTS: UKA may provide satisfactory treatment outcomes even for older patients with multiple comorbidities. RDCI was suggested to be useful for assessing function after UKA.