Affiliations: [a] Department of Physical Therapy, Kawasaki Junior College of Rehabilitation, Kurashiki, Japan | [b] Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, Kobe, Japan | [c] Rehabilitation Center, Kawasaki Medical School Hospital, Kurashiki, Japan | [d] Department of Bone and Surgery, Kawasaki Medical School, Kurashiki, Japan
Correspondence:
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Corresponding author: Shigeharu Tanaka, Department of Physical Therapy, Kawasaki Junior College of Rehabilitation: 672, Matsushima, Kurashiki, Okayama 701-0192, Japan. Tel.: +81 86 464 1179; Fax: +81 86 464 1108; E-mail:stanaka@med.kawasaki-m.ac.jp
Abstract: BACKGROUND: The symptoms of hip osteoarthritis (OA) influence
instrumental activities of daily living (IADL). Evidence form previous
studies suggest that body functions and walking speed are important
etiological factors for IADL. However, no studies have investigated which
factors that have the greatest influence on IADL. OBJECTIVE: The aims of this study were (1) to analyze factors
related to IADL in patients with hip OA, including 10 m walking speed (10 mWS), and (2) to establish cut-off values for factors that predict
maintenance of IADL. METHODS: Forty-eight patients participated in this study. IADL was
treated as dependent variable. Range of motion (ROM), muscle strength of the
hips and knees, and 10 mWS were measured as independent variables. Other
potential confounding factors were also measured. Data were analyzed using
hierarchical multiple regression and Receiver Operating Characteristic curve
analysis. RESULTS: The hip flexion ROM on the affected side and 10 mWS were
selected as significant variables in this study. The cut-off values obtained
were 92.5 degrees for the hip flexion ROM on the affected side and 42.3 m/min for 10 mWS. CONCLUSIONS: The suggested target associated with maintaining IADL
in patients with hip OA is the cut-off value of 42.3 m/min for 10 mWS found
in this study.
Keywords: Instrumental activities of daily living, osteoarthritis of the hip, walking speed
