There was no abnormality of nerve root morphology. We could detect the largest EMG waves in 202 roots (L2:32, L3:45, L4:40, L5:41, S1:44). The second largest wave was detected in 120 roots. The largest EMG wave was observed by L2: QF80%, L3: QF63%, L4: QF45%, L5: TA52% and S1: GC44%. The second largest waves were observed by L2: QF45%, L3: QF48%, L4: QF30%, L5: TA45% and S1: GC41%. The waves of AL were found similar frequency (12-18%) in L2-5, and waves of hamstrings were found similar frequency (10-20%) in L2-S1. The rates of coincidence with right and left roots domination were L2:63%, L3:44%, L4:15%, L5:32%, S1:59%.