Prevention of postlaminectomy scar formation

Area of Science:

• Biomaterials Science
• Surgical Innovation
• Spinal Surgery

Background:

• Scar formation and adhesion following lumbar laminectomy can lead to complications such as post-laminectomy syndrome.
• Biodegradable interposing materials are being explored to mitigate adverse tissue reactions after spinal surgery.

Purpose of the Study:

• To evaluate the efficacy of polylactic acid (PLA) foam and membrane as interposing materials for preventing scar formation after lumbar laminectomy in a canine model.
• To assess the biocompatibility and degradation characteristics of PLA-based materials in spinal surgical sites.

Main Methods:

• A canine model with L5 or L6 laminectomy was used, with experimental groups receiving PLA membrane or foam coverage and control groups receiving no coverage.
• Histological evaluation of lumbar spines was performed at varying intervals (2-52 weeks) post-surgery to assess scar tissue formation, adhesion, and material degradation.
• Biocompatibility and biodegradability of the PLA materials were assessed through histological analysis.

Main Results:

• The PLA membrane demonstrated potential in reducing scar tissue extension and adhesion but exhibited challenges with marginal fitting.
• PLA foam acted as a scaffold, promoting scar tissue extension and adhesion to the nerve, similar to other tested foam materials like gelatin foam or avitane.
• Both PLA membrane and foam were found to be biocompatible and exhibited slow biodegradation.

Conclusions:

• While PLA membrane shows promise for scar prevention, its marginal fitting requires improvement.
• PLA foam may exacerbate scar adhesion, suggesting it is not ideal as a standalone material for preventing scar tissue.
• A combination of a stiff, posteriorly convexed PLA membrane with PLA foam as a marginal gap filler could potentially prevent both scar tissue adhesion and post-laminectomy spinal stenosis.