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Operative technique (Part I). Marking the outline of the medial and lateral heads of the gastrocnemius muscle, the popliteal crease, the insertion of the Achilles tendon, and the lazy-S-line of incision on the proximal part of the lower leg (a). Exposure of the medial sural nerve between the medial and lateral heads (white arrows) of the gastrocnemius muscle before (b) and after (c) external neurolysis. Excision of a 2 cm nerve biopsy segment for neuropathological examination (d).
