The peroneal communicating nerve (fibular communicating nerve) is a branch of the lateral sural cutaneous nerve that crosses the lateral calf to join the medial sural cutaneous nerve, forming the sural nerve. Its presence, size, and junction point are highly variable. In approximately 25% of individuals the peroneal communicating nerve is absent and the sural nerve is formed by direct union of the medial and lateral sural cutaneous nerves.
The peroneal communicating nerve determines the formation and course of the sural nerve and affects sural nerve graft harvest planning. Pre-harvest ultrasound or nerve mapping identifies the variable sural nerve formation to guide the incision location and the length of graft obtainable. Understanding sural nerve formation variants is important in planning sural nerve blocks for ankle surgery anaesthesia.
The peroneal communicating branch determines how far proximally the sural nerve is formed as a single trunk; when the communicating branch joins high in the calf, a longer single-trunk graft is obtainable from the ankle to the junction, while a low junction limits harvestable length.
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