A new nerve coaptation technique using a biodegradable honeycomb-patterned film

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Surgical Innovation

Background:

• Neurorrhaphy, the surgical connection of severed nerves, is crucial for functional recovery.
• Current methods face challenges including nerve adhesion and inflammation, potentially hindering outcomes.
• Biodegradable materials offer potential solutions for nerve repair reinforcement.

Purpose of the Study:

• To evaluate the efficacy of a novel biodegradable poly-lactide (PLA) honeycomb film as a reinforcing material for neurorrhaphy.
• To assess the mechanical strength, histological effects, and functional recovery associated with the honeycomb film.
• To determine if the honeycomb film prevents adhesion and inflammation during nerve repair.

Main Methods:

• Development of biodegradable PLA films with a honeycomb-patterned porous structure (7- and 10-μm thickness) and a non-porous cast film control.
• Application of films as external wraps following bilateral sciatic nerve transection and two-stitch neurorrhaphy in 35 rats.
• Assessment of breaking strength at 2 days and histological/functional analyses at 6 weeks post-operation.

Main Results:

• The 10-μm honeycomb film significantly increased breaking strength compared to no wrapping (P = 0.013).
• Breaking strength of the 10-μm honeycomb film was comparable to traditional four-stitch neurorrhaphy (P = 0.497).
• No adverse effects on functional recovery, adhesions, or inflammation were observed with the honeycomb film groups.

Conclusions:

• Biodegradable PLA honeycomb film, particularly the 10-μm variant, provides effective mechanical reinforcement for neurorrhaphy.
• The honeycomb film facilitates adhesion-free nerve healing and does not impede functional recovery.
• This material presents a promising alternative for enhancing nerve repair outcomes in clinical practice.