Affiliations: [a] Department of Rehabilitation Medicine, Tokyo Medical and Dental University Graduate School, Tokyo, Japan | [b] Department of Rehabilitation, Shonan Kamakura General Hospital, Kanagawa, Japan | [c] School of Nursing and Rehabilitation Sciences, Showa University, Kanagawa, Japan | [d] Research Institute for Sport and Exercise Sciences, Showa University, Kanagawa, Japan | [e] Department of Orthopedic Surgery, Dokkyo Medical University Saitama Medical Center, Saitama, Japan
Correspondence:
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Corresponding author: Keigo Nanjo, Department of Rehabilitation Medicine, Tokyo Medical and Dental University Graduate School, 1-5-24, Yusima, Bunkyo-ku, Tokyo 113-8510, Japan. E-mail: nanjo.reh@tmd.ac.jp.
Abstract: BACKGROUND: The population of older adults with knee osteoarthritis (OA)-related disabilities is increasing globally. However, studies regarding instrumental activities of daily living (IADL) in older adults with knee OA are limited. OBJECTIVE: This study investigated the psychological factors associated with IADL disability in older adults with moderate to severe knee OA. METHODS: A cross-sectional study was conducted on 179 patients with knee OA aged ⩾ 65 years. The six-item short form of the Pain Catastrophizing Scale (PCS-6), the four-item short form of the Pain Self-Efficacy Questionnaire (PSEQ-4), and the fifteen-item Geriatric Depression Scale (GDS-15) were used to assess psychological factors. The participants were divided into IADL disabled and non-disabled groups. Binary logistic regression analyses were performed with the IADL disability status as the dependent variable. The PCS-6, PSEQ-4, and GDS-15 tools were included as independent variables in the logistic regression model. RESULTS: Of the 179 participants, 88 (49.1%) showed disability in conducting IADL. PSEQ-4 (odds ratio = 0.90, 95%; confidence interval = 0.82–0.99, p= 0.02) was a significant independent variable among all psychological factors. CONCLUSION: Even after controlling for cofounders, our study found that self-efficacy, assessed using the PSEQ-4, was related to IADL disability in older adults with moderate to severe knee OA.
