Extended Sural Nerve Harvest: A Technique to Gain Additional Graft Length

The sural nerve is widely used as a nerve graft for various types of peripheral nerve repair due to its ease of harvest and acceptable donor-site morbidity. Nevertheless, certain clinical scenarios, such as cable grafting or multiple cross-face nerve grafts, require grafts longer than the typical 35 cm. This study aims to investigate the anatomic feasibility and clinical safety of an extended sural nerve harvest above the popliteal crease by interfascicular dissection.

An anatomic study using 5 fresh-frozen cadaver legs was conducted, focusing on identifying the anatomic relationship of the sural nerve above the popliteal crease to its surrounding structures and nerve histopathology. A retrospective review was performed of all patients who underwent an extended sural nerve harvest, and patient outcomes, including nerve graft length and postoperative complications, were reviewed to evaluate the clinical feasibility of the extended harvest technique.

Anatomic dissection revealed that interfascicular dissection allowed for an additional 14.3 ± 6 cm of nerve length, achieving a total graft length of 49.1 ± 5 cm. Histologic analysis showed no significant differences in fascicle number or axon count along the nerve. A retrospective review, which included 7 adults and 2 pediatric patients, demonstrated that an extended sural nerve harvest was feasible and safe. The maximum graft length was 55 cm, and no intraoperative complications or functional deficits were reported.

The extended sural nerve harvest above the popliteal crease with a step-incision approach was both anatomically feasible and clinically safe, providing additional graft length without increasing donor-site morbidity.