A Multicenter Prospective Randomized Comparison of Conduits Versus Decellularized Nerve Allograft for Digital Nerve...

Area of Science:

• Regenerative Medicine
• Neurosurgery
• Biomaterials Science

Background:

• Digital nerve injuries pose challenges for functional recovery.
• Both processed nerve allografts (PNA) and nerve conduits are used for digital nerve repair.
• Comparative efficacy data for these techniques, especially for varying gap lengths, is limited.

Purpose of the Study:

• To compare the efficacy of PNA versus conduit-based repairs for digital nerve injuries.
• To determine optimal application of PNA and conduits based on nerve gap length.
• To test the hypothesis that PNA yields superior functional recovery for longer gaps.

Main Methods:

• A prospective, randomized, blinded study enrolled 220 patients (aged 18-69) with digital nerve injuries.
• Patients were stratified into short (5-14 mm) and long (15-25 mm) gap subgroups.
• Repairs were randomized to PNA or collagen conduit, with outcomes assessed up to 12 months post-surgery.

Main Results:

• For short gaps, PNA and conduits showed similar static two-point discrimination (7.3 mm vs 7.5 mm).
• For long gaps, PNA demonstrated significantly better static two-point discrimination (6.1 mm) than conduits (7.5 mm).
• Normal sensation was achieved in 40% of PNA long gap repairs versus 18% for conduits; long gap conduits had more clinical failures.

Conclusions:

• Processed nerve allografts (PNA) are clinically superior to conduits for long gap digital nerve reconstructions.
• Both PNA and conduits offer comparable nerve regeneration for short gap digital nerve repairs.
• PNA shows promise for improving outcomes in longer digital nerve defects.