Study Design. This study analyzed anatomic parameters between the thoracic pedicles and the spinal nerve roots.; Objectives. To quantitatively determine the anatomic ralations of the thoracic pedicle to the adjacent neural structures.; Summary of background data. Pedicular screw placement carries with it potential hazard to the surrounding neural structures, especially in the thoracic spine. No studies exist regarding the anatomic relations of the thoracic pedicle to the adjacent nerve roots.; Methods. Fifteen cadavers were obtained for study of the thoracic spine. All soft tissue was dissected off of the thoracic spine. Laminectomy and total removal of the superior and inferior articular facets was then performed on C7-T1 through T12-L1 to expose the pedicles, nerve roots and dura. Measurements were taken from the pedicle to the nerve root superiorly and inferiorly as well as between the pedicles. Also, the superoinferior diameter of the nerve root and the frontal angle of the nerve root were measured. Symmetrical structures were measured bilaterally. (Abstract shortened by UMI.)
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