THE MEDIAL CALCANEAL NERVE - ANATOMY AND NERVE-CONDUCTION TECHNIQUE

We report a new technique for studying conduction in the medial calcan eal nerve (MCN), Dissection of 14 cadaver feet revealed the optimal G( 1) site to be one third of the way from the apex of the heel to a poin t midway between the navicular tuberosity and the prominence of the me dial malleolus, Seventy-two feet (36 healthy volunteers) were studied using surface stimulation of the tibial nerve 10 cm proximal to the G( 1) surface electrode. Averaging technique was not required, Reference values (mean +/- 2 SD) were determined for MCN onset latency (2.0 +/- 0.3 ms), peak latency (2.5 +/- 0.3 ms), onset conduction velocity (61 +/- 11 m/s), peak conduction velocity (40 +/- 5 m/s), baseline-to-peak amplitude (18 +/- 6 mu V), and maximum intrasubject side-to-side diff erences in these values (0.3 ms, 0.3 ms, 15 m/s, 5 m/s, and 17 mu V, r espectively), This study provides an easily performed, reproducible me thod for electrophysiologic evaluation of the MCN. (C) 1996 John Wiley and Sons, Inc.