title: Objective measurement of L4-5 instability. A case report.
abstract: 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.
mesh_terms: D000328:Adult; D001416:Back Pain / Q000209:etiology; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D008159:Lumbar Vertebrae; D008297:Male; D011859:Radiography; D013123:Spinal Fusion