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The Journal of Bone and Joint Surgery, Vol 76, Issue 3 413-424, Copyright © 1994 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

Mechanical behavior of the human lumbar and lumbosacral spine as shown by three-dimensional load-displacement curves

MM Panjabi, TR Oxland, I Yamamoto and JJ Crisco
Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510.

The lumbar region is a frequent site of spinal disorders, including low-back pain, and of spinal trauma. Clinical studies have established that abnormal intervertebral motions occur in some patients who have low-back pain. A knowledge of normal spinal movements, with all of the inherent complexities, is needed as a baseline. The present study documents the complete three-dimensional elastic physical properties of each lumbar intervertebral level from the level between the first and second lumbar vertebrae through the level between the fifth lumbar and first sacral vertebrae. Nine whole fresh-frozen human cadaveric lumbar-spine specimens were used. Pure moments of flexion-extension, bilateral axial torque, and bilateral lateral bending were applied, and three-dimensional intervertebral motions were determined with use of stereophotogrammetry. The motions were presented in the form of a set of six load-displacement curves, quantitating intervertebral rotations and translations. The curves were found to be non-linear, and the motions were coupled. The ranges of motion were found to compare favorably with reported values from in vivo studies.
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