American Journal of Roentgenology, Vol 159, 799-803, Copyright © 1992 by American Roentgen Ray Society

ARTICLES

Spondylolysis, spondylolisthesis, and associated nerve root entrapment in the lumbosacral spine: MR evaluation

JR Jinkins, JC Matthes, RN Sener, S Venkatappan and R Rauch
Neuroradiology Section, University of Texas Health Science Center, San Antonio 78284-7800.

Spondylolysis is defined as a bone defect in the pars interarticularis. Its cause is uncertain but is believed in most cases to be related to repeated stress, trauma, or both. Findings of spondylolysis on conventional radiographs and on CT scans have been well characterized. Although these imaging techniques remain effective for the diagnosis of this defect, MR imaging is increasingly used as the primary or sole imaging method in patients with lower back pain and radiculopathy. Therefore, because MR images of the lumbar spine may be interpreted in the absence of correlative CT scans or conventional radiographs, the MR features of spondylolysis and its associated findings must be recognized. This essay illustrates the MR findings of lumbosacral spondylolysis and associated entrapment and direct impingement of the spinal nerve root.
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