# Surgical Outcomes in Non-Transected and Partially Transected Peripheral Nerve Injuries

## TL;DR

This paper reviews surgical outcomes for non-transected and partially transected peripheral nerve injuries, offering guidance on optimal treatment strategies and factors affecting recovery.

## Contribution

The study provides a systematic review and case illustration to clarify surgical management and outcomes for understudied peripheral nerve injuries.

## Key findings

- Neurolysis of NAP-positive lesions often restores antigravity strength, with ~75% recovery from direct repair or grafting of nonconductive segments.
- Brachial plexus/axillary neuromas-in-continuity show ~77–92% improvement after neurolysis or reconstruction.
- Earlier intervention, shorter gaps, and younger age correlate with better outcomes, while prolonged observation risks end-organ atrophy.

## Abstract

Background: Non-transected and partially transected peripheral nerve injuries (neuromas-in-continuity) are relatively common but understudied. Their optimal surgical management and expected outcomes remain unclear. We conducted a literature review of surgical repairs in such lesions and illustrate a case to guide decision-making. Systematic searches of PubMed and Google Scholar identified 70 eligible reports (Level I = 2, Level II = 5, Level III = 37, Level IV = 20, Level V = 4). Across studies, neurolysis of NAP-positive lesions often restored antigravity strength, while direct repair or grafting of nonconductive segments yielded meaningful recovery in ~75%. After neurolysis or reconstruction, ~77–92% of brachial plexus/axillary neuromas-in-continuity reached LSUHSC Grade ≥3. Median/ulnar lesions treated with neurolysis, biologic/vascularized coverage, or reconstruction showed reliable pain relief but variable sensory/motor recovery. Radial/PIN lesions improved in some series irrespective of NAPs. Earlier intervention, shorter gaps, distal sites, and younger age correlated with superior outcomes. Meanwhile, prolonged observation risking end-organ atrophy degraded results. Adjuncts such as electrical stimulation and wraps may aid reinnervation or reduce scarring, though high-quality evidence is limited. Conclusions: For non-transected and partially transected PNIs, a pragmatic approach emerges: Observe low-grade injuries with serial examinations. Explore early if recovery stalls (≈3–6 months). Use NAP-guided neurolysis for conductive lesions. Perform tension-free repair or grafting for nonconductive segments, adding anti-adhesive coverage when appropriate. Standardized reporting and prospective trials are needed to refine timing, technique selection, and patient-reported outcomes.