| Change of Parameters in Plantar Nerve Conduction Study According to Approximation of Needle Electrode to Tibial Nerve Using Near-Nerve Needle Technique |
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| Abstract |
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Objectives : To evaluate the change of parameters in the plantar nerve conduction study according to approximation of needle electrode to the tibial nerve using orthodromic near-nerve needle recording technique. Methods : Fourteen feet without any neurological symptoms or signs of neuropathy, were enrolled. Their mean age was 47 years. For the near-nerve needle recording of sensory nerve action potential (SNAP), an active needle recording electrode was inserted closely to the tibial nerve above flexor retinaculum. In this study, three positions of the needle tip were guaranteed by eliciting the great toe movement with a 5, 3, and 1 mA of the stimulus intensity and 0.05 msec of the stimulus duration by adjusting the depth and the position of the needle electrode. Then, the medial and lateral plantar nerve conduction studies were performed using the same needle recording electrode by stimulating the 1st and 5th toes with ring electrodes. Results : The mean amplitudes of the medial plantar nerve were 0.8 0.5, 2.5 1.0, and 3.1 1.2 V, and the lateral plantar nerve were 0.6 0.2, 2.0 0.8, 2.5 0.8 V with the needle electrode at 5, 3 and 1 mA position respectively. The amplitudes of the medial and the lateral plantar nerves in 3 and 1 mA compared with 5 mA position were higher (p<0.05). The difference of maximum conduction velocity and the onset and peak latencies between needle positions were statistically not significant. Conclusion : These results demonstrated that the approximation of the needle electrode about the tibial nerve affected the amplitude of SNAP. It is necessary to define the approximation status of the needle electrode about their examined nerve in the near-nerve needle technique. |
| Key Words:
Near-nerve needle technique, Plantar nerve, Approximation of needle electrode |
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