Microsurgical Peripheral Nerve Repair & Autologous Cable Grafting
Acute deep lacerations from broken glass, knife injuries, or industrial machinery frequently transect major peripheral nerves in the forearm, wrist, and hand (median, ulnar, radial, and digital nerves). A severed nerve cannot heal on its own; without prompt microsurgical coaptation, the severed distal nerve fibers undergo irreversible Wallerian degeneration, while the proximal stump forms a painful traumatic neuroma, resulting in permanent paralysis and numbness.
Principles of Tension-Free Microsurgical Repair
Dr. Vishal Purohit utilizes high-magnification operating microscopes to achieve anatomical restoration:
- Primary Epineural Coaptation: When nerve ends can be brought together without tension, the outer epineural sheath is re-approximated using ultra-fine 9-0 or 10-0 non-absorbable monofilament sutures, aligning matching motor and sensory fascicles under 15x–20x magnification.
- Autologous Sural Nerve Cable Grafting: In neglected or crush lacerations with a nerve gap greater than 2 cm, stretching nerve ends together causes severe endoneurial ischemia and failure. Multiple cable segments of the expendable sural nerve (from the back of the calf) are harvested to bridge the gap without tension.
- Synthetic Nerve Conduits: For short sensory digital nerve gaps (<1.5 cm), collagen or bioabsorbable conduits provide an enclosed micro-environment for axonal growth cones.
The Biology of Nerve Regeneration
Regenerating nerve axons sprout from the proximal stump and advance down the Schwann cell tubes of the distal nerve at approximately 1 mm per day (1 inch per month). Guided sensory re-education and occupational therapy ensure maximum functional recovery.