Research Article

Navigated Transtubular Extraforaminal Decompression of the L5 Nerve Root at the Lumbosacral Junction: Clinical Data, Radiographic Features, and Outcome Analysis

Figure 4

Extraforaminal stenosis at the lumbosacral junction. The degeneration of the lower lumbar spine leads to collapsing of the L5-S1 segment, contact between the sacrum and the L5-transverse process, and a very narrow operating window on the symptomatic side (left) that requires significant bone removal (patient number 3).