Broad and Asymmetric Lower Extremity Myotomes: Results From Intraoperative Direct Electrical Stimulation of the Lumbosacral Spinal Roots.

Study Design: Retrospective review of prospectively collected data.

Objective: This study aimed to accurately map the lower extremity muscles innervated by the lumbar spinal roots by directly stimulating the spinal roots during surgery.

Summary Of Background Data: Innervation of the spinal roots in the lower extremities has been estimated by clinical studies, anatomic studies, and animal experiments.