Polycaprolactone/Polylactic Acid Membrane Fails to Prevent Laminectomy-induced Sprouting of CGRP- and SP-immunopositive Nerve Fibres in the Dura mater lumbalis of Rats

Abstract

Background Context Mechanisms and prevention of failed back surgery syndromes are rarely known in the clinical context. It has been shown that laminectomy induces outgrowth of putative nociceptive peptidergic afferents in the dura mater lumbalis of rats.

Purpose We aimed to investigate whether the application of a polycaprolactone/polylactic acid membrane (Mesofol) after surgery inhibits sensory hyperinnervation.

Materials/Methods Adult Lewis rats were assigned to three groups: Control (no manipulation), Laminectomy and Laminectomy + Mesofol. Six weeks post-surgery, the durae were removed, immunohistochemically stained for CGRP- and SP-positive afferents and their density quantified.

Results In controls, CGRP- and SP-positive neurons were predominantly found in ventral but rarely observed in dorsal parts of the dura. Following laminectomy, the density of afferents significantly increased ventrally, resulting in a dense network of nerve fibers. In dorsal regions, neuronal sprouting of was observed. Covering the dura with Mesofol after laminectomy had no impact on nerve fibre outgrowth.

Conclusion Application of Mesofol neither prevents nor significantly diminishes the laminectomy-induced increase in the density of peptidergic afferents.

Keywords

laminectomy - failed back surgery syndrome - biodegradable membrane - Mesofol - CGRP-/SP-immunopositive nerve fibers

Publikationsverlauf

Eingereicht: 22. Februar 2022

Angenommen: 26. April 2022

Artikel online veröffentlicht:
01. August 2022

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