It is difficult to record successfully the action potential of the lateral femoral cutaneous nerve because of anatomic variations in the distribution of branches. The objective of this study was to show improved detection rate of the action potential of the lateral femoral cutaneous nerve using modified Butler's method, that is, the recording electrodes consisted of a pair of ring electrode instead of disc surface electrode to increase pick-up area.

Twenty male adults free of disease were examined with modified Butler's method. Their ages ranged from 23 to 58 years. The mean conduction velocity, the mean distal latency, and the mean amplitude were 49.07±4.07m/sec, 2.42±0.20msec, and 16.91±3.63㎶ respectively.