title: Disability measurement in persons with back pain: a validity study of spinal range of motion and velocity.
abstract: OBJECTIVE
  To evaluate the criterion validity and responsiveness to change of spine kinematic variables to assess disability in patients with low back pain.
  
  
  METHODS
  Blinded comparison between spine kinematic variables, Oswestry disability questionnaire scores, and work status.
  
  
  METHODS
  Multidisciplinary occupational rehabilitation clinic of a university hospital.
  
  
  METHODS
  Population-based cohort of 111 patients with subacute work-related back pain who were absent from regular work for more than 4 weeks because of back pain.
  
  
  METHODS
  This study was part of a population-based randomized clinical trial. Patients were randomized to 4 different methods of management: usual care, rehabilitation, ergonomics, or rehabilitation and ergonomics.
  
  
  METHODS
  Oswestry disability questionnaire, kinematic analysis of the spine during flexion and extension of the trunk, and work status were collected at weeks 4, 12, 24, and 52 after the back accident.
  
  
  RESULTS
  Kinematic variables were poorly to moderately related to work status and Oswestry questionnaire scores. Kinematic variables were also unresponsive to change in work status and Oswestry questionnaire scores over time.
  
  
  CONCLUSIONS
  Spine kinematics during flexion and extension of the trunk do not appear to be a valid measure of disability in patients with subacute and chronic back pain.
authors.affiliation: Centre de Recherche Clinique, Hôpital Charles-LeMoyne, Greenfield Park, Québec, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Poitras
authors.forename: P
authors.initials: P
authors.lastname: Loisel
authors.forename: F
authors.initials: F
authors.lastname: Prince
authors.forename: J
authors.initials: J
authors.lastname: Lemaire
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001696:Biomechanical Phenomena; D004185:Disability Evaluation; D004651:Employment; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000175:diagnosis* / Q000534:rehabilitation; D008297:Male; D008875:Middle Aged; D009068:Movement; D011792:Quebec; D015203:Reproducibility of Results; D013131:Spine / Q000503:physiopathology*; D011795:Surveys and Questionnaires