title: Walking speed affects instrumental activities of daily living in patients with hip osteoarthritis.
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.
authors: Department of Physical Therapy, Kawasaki Junior College of Rehabilitation, Kurashiki, Japan.|Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, Kobe, Japan.
authors: Shigeharu
authors: S
authors: Tanaka
authors: Department of Physical Therapy, Kawasaki Junior College of Rehabilitation, Kurashiki, Japan.
authors: Shinsuke
authors: S
authors: Matsumoto
authors: Rehabilitation Center, Kawasaki Medical School Hospital, Kurashiki, Japan.
authors: Takaki
authors: T
authors: Kawashima
authors: Department of Bone and Surgery, Kawasaki Medical School, Kurashiki, Japan.
authors: Shigeru
authors: S
authors: Mitani
authors: Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, Kobe, Japan.
authors: Yasushi
authors: Y
authors: Miura
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D015207:Osteoarthritis, Hip / Q000503:physiopathology*; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies; D000072797:Walking Speed / Q000502:physiology*
keywords: Instrumental activities of daily living; osteoarthritis of the hip; walking speed