Split-sciatic nerve surgery: A new microsurgical model in experimental nerve repair.

Area of Science:

• Neuroscience
• Regenerative Medicine
• Surgical Innovation

Background:

• Standard sciatic nerve injury models in rats often cause significant hindlimb autophagy, posing ethical and research challenges.
• Developing alternative surgical models is crucial for reliable and ethically sound nerve regeneration studies.

Purpose of the Study:

• To introduce and evaluate a new microsurgical model for sciatic nerve regeneration in rats, the split-sciatic technique.
• To assess animal morbidity and the consistency of research outcomes compared to traditional sciatic axotomy.

Main Methods:

• The distal sciatic nerve was split, and a 1 cm gap in the peroneal segment was bridged with fibrin conduits containing differentiated adipose-derived stem cells (dASC) or empty conduits.
• Control groups included autografts and sham operations.
• Histomorphometric analysis and walking track analysis were performed at 12 weeks post-implantation.

Main Results:

• The split-sciatic technique significantly reduced animal autophagy.
• Histomorphometric analysis yielded consistent results comparable to previous studies using full sciatic axotomy.
• Walking track analysis demonstrated superior nerve regeneration in both autograft and dASC groups.

Conclusions:

• The split-sciatic nerve surgery model effectively reduces animal morbidity and ethical issues.
• This technique provides consistent and representative regeneration outcomes, facilitating more efficient functional evaluation.
• The model is suitable for studying nerve regeneration strategies, including the use of stem cells in fibrin conduits.