Figure 1.

A. Magnetic resonance image showing L4/5 lateral recess stenosis (left). B. The Kirschner wire was attached to the tip of the superior articular process (lateral and anteroposterior view) C. A reamer was used to enlarge the foramen by removing the ventral aspect of the superior articular process. The tip of the reamer was not allowed to get over the medial border of the pedicle, and this was verified via fluoroscopy (anteroposterior view). D. The working cannula was placed though the foramina. E. The dorsal and ventral decompressions were completed around the nerve root. F. Decompression was confirmed.