Extracanalicular lumbar disc herniation (ELDH) is a specific clinical entity with compression of the nerve root in its extraforaminal course. The classical midline interlaminar approach is often difficult because the facet joint obviates a direct view of the nerve, and a partial facetectomy is required. Consequently, the risk of instability or continued postoperative back pain is increased. The authors performed a microsurgical muscle-splitting approach in an attempt to obtain a direct view of the disc rupture without sacrificing the facet joint. Twenty-eight consecutive patients were operated upon with this surgical procedure. A retrospective study showed that 10 patients (35.7%) had an excellent, 13 (46.4%) a good, 4 (14.3%) a fair and one (3.6%) a poor result, according to the Macnab criteria. No serious postoperative complications were noted. This procedure is safe, effective and less invasive.
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