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© 1992 British Society for Rheumatology

other

VARIATION IN LUMBAR SPINE MOBILITY MEASURED OVER A 24-HOUR PERIOD

P. RUSSELL, A. WELD, M. J. PEARCY*, R. HOGG and A. UNSWORTH

Centre for Biomedical Engineering, University of Durham

An electronic device for the measurement of three-dimensional movements, the Polhemus Navigation Sciences 3Space Isotrak system, was used to measure the range of movement in the lumbar spine of: (1) 10 young adults pre- and post- normal night-time sleep; (2) 10 young adults tested every 2 h over a 24-h period. The results obtained for the 10 subjects tested pre-/post-sleep showed there to be significant decreases in flexion, extension and lateral bend post-sleep. Axialrotation was not seen to alter significantly. The results obtained for the 10 subjects tested over a 24-h period showed movement during the day to be significantly more than at night. A decrease in the range of all movements except extension was observed when testing subjects in the early hours of the morning (after they had been supine for a minimum of 4 h) relative to the range observed from mid-afternoon to early evening.

KEY WORDS: Lumbar spinal movement, 3Space Isotrak, Circadian variation

*Now at Department of Orthopaedic Surgery and Trauma, Royal Adelaide Hospital, Australia.


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