title: Relationship Between Pedometer-Based Physical Activity and Physical Function in Patients With Osteoarthritis of the Knee: A Cross-Sectional Study.
abstract: To examine the association between pedometer-based ambulatory physical activity (PA) and physical function in patients with knee osteoarthritis (OA).
  
  
  
  Cross-sectional observational study.
  
  
  
  Institutional practice.
  
  
  
  Participants in orthopedic clinics (N=207; age, 56-90y; 71.5% women) with diagnosed radiographic knee OA (Kellgren/Lawrence [K/L] grade ≥1).
  
  
  
  Not applicable.
  
  
  
  Ambulatory PA was objectively measured as steps per day. Physical function was assessed using the Japanese Knee Osteoarthritis Measure (JKOM) functional subcategory, 10-m walk, Timed Up and Go (TUG), and 5-repetition chair stand (5CS) tests.
  
  
  
  Patients walking <2500 steps/d had a low level of physical function with a slower gait speed, longer TUG time, and worse JKOM functional score compared with those who walk 2500 to 4999, 5000 to 7499, and ≥7500 steps/d adjusted for age, sex, body mass index [BMI], and K/L grade. Ordinal logistic regression analysis revealed that steps per day (continuous) was associated with better physical function adjusted for age, sex, BMI, and K/L grade. These relationships were still robust in sensitivity analyses that included patients with K/L grades ≥2 (n=140).
  
  
  
  Although increased ambulatory PA had a positive relationship with better physical function, walking <2500 steps/d may be a simple indicator for a decrease in physical function in patients with knee OA among standard PA categories. Our findings might be a basis for counseling patients with knee OA about their ambulatory PA and for developing better strategies for improving physical function in sedentary patients with knee OA.
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science, Tokyo, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Iijima
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Fukutani
authors.affiliation: Rehabilitation Center, Fujioka General Hospital, Gunma, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Isho
authors.affiliation: Nozomi Orthopaedic Clinic, Hiroshima, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Yamamoto
authors.affiliation: Nozomi Orthopaedic Clinic Studium, Hiroshima, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Hiraoka
authors.affiliation: Nozomi Orthopaedic Clinic, Hiroshima, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Miyanobu
authors.affiliation: Nozomi Orthopaedic Clinic Hiroshima, Hiroshima, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Jinnouchi
authors.affiliation: Nozomi Orthopaedic Clinic, Hiroshima, Japan; Nozomi Orthopaedic Clinic Studium, Hiroshima, Japan; Nozomi Orthopaedic Clinic Hiroshima, Hiroshima, Japan.
authors.forename: Eishi
authors.initials: E
authors.lastname: Kaneda
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan. Electronic address: aoyama.tomoki.4e@kyoto-u.ac.jp.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Aoyama
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kuroki
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
mesh_terms: D056044:Actigraphy / Q000706:statistics & numerical data*; D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D005684:Gait; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000534:rehabilitation*; D058992:Social Participation; D016138:Walking / Q000502:physiology*
keywords: Osteoarthritis; Physical fitness; Rehabilitation