Nerve Conduction Study of Medial Calcaneal Nerve in Healthy Koreans

ABSTRACT

OBJECTIVE: To determine the normal values of medial calcaneal nerve (MCN) conduction study for the diagnostic reference value. METHOD: The subjects were healthy 54 adults (30 males, 24 females). Antidromic sensory nerve conduction study of medial calcaneal nerve was performed in 108 feet of the subjects. The active surface electrode (G1) was placed to the point of one third of the distance from the apex of the heel to a point midway between the navicular tuberosity and prominence of the medial malleolus. The reference surface electrode (G2) was placed to the apex of the heel. The stimulation was done at the site of 10 cm proximal to the proposed G1 site. RESULTS: Reference values (mean+/-2 SD) were determined for MCN onset latency (1.62+/-0.16 msec), peak latency (2.41+/-0.19 msec), baseline-to-peak amplitude (12.46+/-4.87 microV), onset conduction velocity (62.28 +/-6.30 m/sec), and peak conduction velocity (41.70+/-3.19 m/sec). The maximum intrasubject side-to-side differences of above values were 0.17 msec, 0.17 msec, 2.90 micro V, 6.63 m/sec, and 2.87 m/sec respectively. The MCN response was elicitable in 92.6% of the subjects. CONCLUSION: The results of this study would be used for the electrophysiologic evaluation of the MCN.