title: Relationship between performance on lumbar dynamometry and Waddell score in a population with low-back pain.
abstract: A prospective, blinded cohort study was performed to investigate the relationship between biomechanical variables measured during lumbar dynamometry and several psychological tests and measures of nonorganic pain behavior. Eighty-five men, aged 18-60 years, who had had low-back pain for longer than 5 weeks participated in the study. Nonorganic pain behavior was measured with the Waddell score, and lumbar function was measured with the Isostation B-200 Lumbar Dynamometer. Two brief psychological tests, the Coopersmith Self-Esteem inventory and an analog self-rating of wellness, were also administered. Relationships between biomechanical variables and psychological tests were calculated with the t-test, the Pearson r correlation, analysis of variance, and multiple step-wise logistic regression. Patients who exhibited excessive illness behavior (Waddell Scores 3-5) performed significantly worse (P less than .01) on almost all biomechanical variables. The Coopersmith Self-Esteem Score and "feelings" score had a slightly weaker but still significant correlation with motor performance. The results suggest that poor performance on biomechanical testing in this population may be a form of abnormal illness behavior and thus may not accurately reflect organic alterations of neuromusculoskeletal function.
authors.affiliation: Division of Physical Medicine and Rehabilitation, University Hospital, Vancouver, British Columbia, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Hirsch
authors.forename: G
authors.initials: G
authors.lastname: Beach
authors.forename: C
authors.initials: C
authors.lastname: Cooke
authors.forename: M
authors.initials: M
authors.lastname: Menard
authors.forename: S
authors.initials: S
authors.lastname: Locke
mesh_terms: D000328:Adult; D001416:Back Pain / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D001696:Biomechanical Phenomena; D015331:Cohort Studies; D016552:Ergometry; D006801:Humans; D008159:Lumbar Vertebrae / Q000503:physiopathology*; D008297:Male; D011446:Prospective Studies; D011581:Psychological Tests; D012649:Self Concept; D012803:Sick Role