Isokinetic trunk strength and lifting strength measures. Differences and similarities between low-back-injured and noninjured workers |
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Authors: | PJ Mandell E Weitz JI Bernstein MH Lipton J Morris D Bradshaw KP Bodkin B Mattmiller |
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Affiliation: | Department of Orthopaedic Surgery, University of California San Francisco-Mount Zion Hospital. |
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Abstract: | Fifty-eight back pain patients and 21 entry-level Postal Service workers without low-back pain were evaluated using a variety of lumbar function measures. Isolated trunk strength and full lifting strength were gauged with isokinetic and isometric methods. Lumbar range-of-motion was computed using toe-touch and goniometers. Conventional clinical techniques such as toe touch and straight leg raise were effective in distinguishing back-injured from normal subjects. Isometric and isokinetic peak force and torque tests failed to show significant differences between low-back pain and job applicant groups. When compared with published norms, our job applicant group was significantly deconditioned. Our data suggest that asymptomatic, deconditioned subjects could be mistaken for back-impaired patients or symptom magnifiers. |
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