The quantitative study of the lateral region to the lumbar pedicle.

Background: An anatomic study of the lumbar nerve lateral to the pedicle was performed on 12 cadavers. Three courses of the lumbar nerve were noted around the pedicle. The direct measurements, including the angle of the lumbar rami with the spinal cord, the axis of the pedicle with the cord in the coronal plane, and the distance between the lateral border of the pedicle to the rami, were made bilaterally.

Results: The results showed that both angles increased as the lumbar spine descended. The spaces between the lumbar rami and the pedicle were found to be less than 5 mm.

Conclusion: The region latero-superior to the pedicle had a similar relationship with the region medial inferior to the pedicle. Nerve entrapment was observed around the lumbar pedicle.