Table 1. Electrophysiologic findings and functional evaluations before and after operation

	Pre op MEP	Intraop monitoring	Post op 1 month	Post op 2 months	Post op 3 months
MEP latency	20.25	21.10	20.75	20.55	20.25
Upper ext (ms)
Rt. lower ext (ms)	No response	No response	No response	51.55	49.80
Lt. lower ext (ms)	No response	No response	No response	49.90	48.40
MEP amplitude	2.7	2.3	2.1	2.5	2.3
Upper ext (mV)
Rt. lower ext (mV)	No response	No response	No response	0.2	0.3
Lt. lower ext (mV)	No response	No response	No response	0.1	0.1
SEP latency	24.8	21.7	23.84	22.5	23.6
Upper ext (ms)
Lower ext (ms)	No response	No response	No response	No response	No response
Functional evaluations
ASIA motor score (0–00)	49		57	68	72
K-MBI (0–100)	44		42	58	64
BBS	4		5	13	17
FAC (0–5)	0		0	1	2
Gait performance	Cannot walk		Cannot walk only therapeutic gait training	Walker gait with moderate assist	Walker gait with moderate to minimal assist

Values are scores.
MEP: motor evoked potential, ASIA: American Spinal Injury Association, K-MBI: Korean version of modified Barthel index, BBS: Berg balance scale, FAC: functional ambulation category.