title: Factors related to low back pain in patients with hip osteoarthritis.
abstract: BACKGROUND
  The incidence of low back pain (LBP) is high in patients with hip osteoarthritis (OA). Evidence from previous studies suggests that lumbar alignments and hip range of motion (ROM) are important etiological factors for LBP. However, no studies have investigated which factors that have the greatest influence on LBP.
  
  
  OBJECTIVE
  This investigation aimed to collectively examine factors related to LBP in patients with hip OA, including lumbar lordosis angle (LLA), leg length discrepancy (LLD), and hip ROM.
  
  
  METHODS
  Thirty-five patients participated in this study. LBP was treated as a dependent variable, whereas hip ROMs were treated as independent variables. Patients' age and body mass index (BMI) were recorded as confounding factors, as were LLA and LLD. A logistic regression model was performed to determine the most accurate set of variables to predict LBP.
  
  
  RESULTS
  BMI and ROM of hip flexion on the affected side were identified as significant variables.
  
  
  CONCLUSIONS
  Our results suggest that BMI and ROM of hip flexion on the affected side are related to LBP in patients with hip OA and need to be assessed.
authors.affiliation: Department of Physical Therapy, Kawasaki Junior College of Rehabilitation, Okayama, Japan Department of Rehabilitation Science, Graduate School of Health Sciences, Kobe University, Hyogo, Japan.
authors.forename: Shigeharu
authors.initials: S
authors.lastname: Tanaka
authors.affiliation: Department of Physical Therapy, Kawasaki Junior College of Rehabilitation, Okayama, Japan.
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Matsumoto
authors.affiliation: Rehabilitation Center, Kawasaki Medical School Hospital, Okayama, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Fujii
authors.affiliation: Instituto Nacional de Rehabilitación, Lima, Perú
authors.forename: Kotaro
authors.initials: K
authors.lastname: Tamari
authors.affiliation: Department of Bone and Surgery, Kawasaki Medical School, Okayama, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Mitani
authors.affiliation: Department of Rehabilitation Medicine, Kawasaki Medical School, Okayama, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Tsubahara
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007870:Leg Length Inequality / Q000150:complications* / Q000503:physiopathology; D008141:Lordosis / Q000150:complications* / Q000503:physiopathology; D017116:Low Back Pain / Q000209:etiology* / Q000503:physiopathology; D008161:Lumbosacral Region / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000150:complications* / Q000503:physiopathology; D016059:Range of Motion, Articular / Q000502:physiology*
keywords: Low back pain; osteoarthritis of the hip; prediction