Motor Evoked Potentials after Supraspinal Stimulation in Pre- and Postoperative Evaluations of Patients with Cervical Radiculopathy

Table 2

Results of the Wilcoxon matched-pairs test (the t-Student test was also used for associated variables, marked in the tables with an asterisk), which show significant differences (bold field) between individual values of parameters that determine root conduction in the pre- and postoperative evaluations.

Spinal root level (N=27)	Lat. Min. F	Freq. F	FCT	RxMEP latency	RxMEP amplitude	RxCT	M-wave amplitude
C5 (recording from DP	nr	nr	na	0.0786	0.0044	nr	0.2333
C6 (recording from BB)	nr	nr	na	0.0035	0.5521	nr	0.6343
C7 (recording from TB)	nr	nr	na	0.1437	0.1882	nr	0.2149
C8 (recording from TB)	0.6938	0.6164	0.5247	0.2665	0.0335	0.3305	0.7032
C8 (recording from ADM)	0.0098	0.1424	0.0306	0.6656	0.5564	0.1183	0.2577

F min. APB: minimum F-wave latency after stimulation of motor fibres, Freq. F: frequency of F-waves after stimulation of nerve motor fibres, FCT: F-wave conduction time, RxMEP: root motor evoked potentials, RxCT: root conduction time, DP: deltoid posterior, BB: biceps brachii, TB: triceps brachii, APB: abductor pollicis brevis, ADM: abductor digiti minimi, nr: nonrecorded, and na: nonanalyzed.