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- W2380674699 abstract "Objective To investigate the morphological characteristics of the intervertebral foramina and their alterations in the process of disc height loss in low lumbar spine in order to provide basic data for the diagnosis and treatment of foraminal stenosis. Methods Eight fresh cadaveric lumbar spines of L3 to S1 were obtained for study, which were cleaned off their surrounding muscles and kept the ligaments, annulus fibrous and nerve roots attached. The morphological characteristics of foramina of L4,5 and L5S1 and their anatomic relationships with the nerve roots were observed with and without nucleus pulposus in situ under different loading conditions (0, 300, 500 N). The foraminal dimensions including heights, maximal widths and minimal widths were measured, and the disc heights were measured on lateral radiograph under above loading conditions as well. Results Without any loading, the foramina were inverted teardrop shaped, the foramina of L4,5 were similar to that of L5S1. The nerve roots were located in the upper part of the foramina, and passed across the foramina obliquely. With 500 N loading, the shapes of the foramina and the relationships with the nerve roots were found to be changed little. After removal of nucleus pulposus and more loading was applied, the foramina became stenotic gradually and the nerve roots were pushed against the superior pedicle. The foraminal heights, maximal widths and the anterior, posterior disc heights became narrower, and were significantly different from those under no loading condition (P 0.05). The foraminal heights had multiple linear correlations with the posterior and the anterior disc heights. Conclusion The shape and dimension of foramina changes as the disc height alters. The foraminal height is significantly correlated with the anterior and the posterior disc height. The alteration of the foraminal morphological characteristics may jeopardize the nerve roots of excessive compression." @default.
- W2380674699 created "2016-06-24" @default.
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- W2380674699 date "2003-01-01" @default.
- W2380674699 modified "2023-09-26" @default.
- W2380674699 title "Experimental study of correlation between morphological characteristics of the intervertebral foramina and disc heights in low lumbar spine" @default.
- W2380674699 hasPublicationYear "2003" @default.
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