An anatomic study of the interspinous space of the lumbosacral spine.

Purpose: The purpose of this study is to quantify the interspinous anatomy at the L4/5 and L5/S1 levels.

Methods: One hundred reconstructed computer tomography scans of the lumbosacral spine were reviewed by two separate surgeons. Data were collected from the midline sagittal reconstructed image at the L4-5 and L5-S1 levels.