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Microsurgical anatomy and operative technique for extreme lateral lumbar disc herniations

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Summary

The anatomy of the lateral aspect of the lumbar spine and our lateral microsurgical technique for extreme lateral lumbar disc herniations (ELLDH) is described. This study was based on the microdissection of 4 cadavers, on the morphometric evaluation of these as well as 6 dried cadaver spines and 8 lumbar CT scans, and on the use of this technique on over 200 cases.

Level dependent changes in the posterior arch cause a shift of the disc space distally relative to the facet joint, an increasing amount of bone to overlie the intervertebral foramen, and a decreasing amount of working space within the exposure in the caudal direction. Therefore, more bone removal from the lateral aspect of the pars interarticularis and supero-lateral aspect of the facet joint is required in the lower lumbar spine. When the exposed ligamentum flavum is resected, the dorsal root ganglion is seen and access to the herniation and disc space is achieved. Level dependent changes in the pedicles and transverse processes lead to an alteration in the course and relationships of the nerves, thereby influencing the pathophysiology of and surgical technique for the ELLDH. The operative target is the lateral aspect of the pars interarticularis and not the intertransverse space as has been previously described.

Our techniques allows for the early identification of the nerve with minimal risks of injury to it, to the adjacent vessels and to the structural integrity of the facet joint and pars interarticularis.

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Abbreviations

DRG:

dorsal root ganglion

ELLDH:

extreme lateral lumbar disc herniation

ESA:

erector spinae aponeurosis

ITL:

intertransverse ligament

L:

lumbar

LA:

lumbar artery

LF:

ligamentum flavum

LIPC:

lateral interpedicular compartment

m.:

muscle

S:

sacral

TP(s):

TP(s) transverse process(es)

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Schlesinger, S.M., Fankhauser, H. & de Tribolet, N. Microsurgical anatomy and operative technique for extreme lateral lumbar disc herniations. Acta neurochir 118, 117–129 (1992). https://doi.org/10.1007/BF01401297

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