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Objective Measurement of L4–5 Instability: A Case Report

WILDER, DAVID G., MSME; SELIGSON, DAVID, MD; FRYMOYER, J W, MD; POPE, M H, PhD

Original Article: PDF Only

Segmental instability as a consequence of disc degeneration is presented as an entity capable of producing low-back pain which responds to surgical stabilization with spinal fusion, and is illustrated with a case report. Data from lumbar radiographs were analyzed with a computer, and the position changes of the lumbar vertebrae were computed relative to the neutral positions of each. The results indicate that segmental instability is a complex disruption of intervertebral motion, consistent with the coupling behavior of the spine.

From the Department of Orthopaedic Surgery, University of Vermont College of Medicine, Burlington, Vermont

© Lippincott-Raven Publishers.