Vascularized Nerve Grafts: Current Concepts, Indications, and Future Perspectives

Area of Science:

• Regenerative Medicine
• Neurosurgery
• Biomaterials Science

Background:

• Peripheral nerve injuries present significant challenges in regeneration and functional recovery, particularly for large defects.
• Non-vascularized autologous nerve grafts often lead to poor outcomes due to necrosis and delayed regeneration.
• Vascularized nerve grafts (VNGs) offer an intrinsic blood supply, improving graft survival and promoting neovascularization.

Purpose of the Study:

• To review the advantages, challenges, and emerging experimental strategies for vascularized nerve grafting.
• To provide a comprehensive overview of the rationale and outcomes associated with VNGs.
• To highlight novel approaches for overcoming limitations in peripheral nerve repair.

Main Methods:

• Literature review of vascularized nerve grafting techniques and outcomes.
• Analysis of comparative studies between VNGs and non-vascularized grafts.
• Exploration of current experimental strategies in nerve regeneration.

Main Results:

• VNGs demonstrate superior functional outcomes, including improved motor and sensory recovery and higher axonal density.
• VNGs show enhanced graft survival, Schwann cell viability, and earlier neovascularization compared to traditional grafts.
• These benefits are particularly evident in long-gap injuries and delayed repair scenarios.

Conclusions:

• Vascularized nerve grafting is a promising alternative for peripheral nerve repair, offering significant advantages over non-vascularized grafts.
• Despite technical complexities and donor site morbidity, VNGs provide superior functional recovery.
• Emerging experimental strategies aim to further optimize VNGs and address current limitations in peripheral nerve regeneration.