1. Posterior displacement of the fifth lumbar vertebra occurs frequently and is an important cause of severe back pain.
2. The displacement happens as the result of an anatomical variation in the facets of the lateral articulations between the fifth lumbar and first sacral vertebrae.
3. Sciatica is of frequent occurrence because of pressure on the fifth lumbar nerve root.
4. Conservative measures seldom cure the symptoms from posterior displacement of the fifth lumbar and, in the majority of cases, lumbosacral fusion is the only effective means of treatment.
(C) 1934 All Rights Reserved.The Journal of Bone and Joint Surgery, Inc.