Reconstructive Techniques and Outcomes for Large (≥4 cm) Peripheral Nerve Defects: A Meta-analysis

Area of Science:

• Neurosurgery
• Regenerative Medicine
• Clinical Outcomes Research

Background:

• Peripheral nerve injuries significantly impair motor and sensory function, impacting quality of life.
• Surgical repair of short nerve defects is established, but large defects (≥4 cm) present significant challenges.
• Current consensus on measuring clinical outcomes after nerve reconstruction is lacking.

Purpose of the Study:

• To summarize surgical techniques and outcomes for peripheral nerve defects measuring 4 cm or more.
• To identify the most common reconstruction methods and their reported efficacy.
• To highlight the need for standardized outcome measures in nerve repair research.

Main Methods:

• Systematic literature search of studies published between 1990 and 2024.
• Inclusion criteria: human studies on surgical nerve reconstruction with defect lengths ≥4 cm and follow-up >3 months.
• Data extraction included sample size, nerve affected, treatment type, follow-up duration, and outcomes.

Main Results:

• Twenty-four studies met eligibility criteria, identifying six reconstruction techniques.
• Flap-associated autologous nerve grafting was the most common technique.
• No single reconstruction technique demonstrated clear superiority for motor or sensory recovery.

Conclusions:

• Multiple surgical approaches exist for long peripheral nerve defects, but none show definitive superiority.
• The lack of standardized outcome measures for motor and sensory function hinders comparative analysis and treatment development.
• Establishing standardized assessment protocols is essential for advancing peripheral nerve repair research and clinical practice.