Table 1.

Patient demographic data.

Patient number	Age	Gender	Follow-up period (months)	Side of procedure	Other diagnoses	Previous operations/procedures
1	56	F	49	Right	HNP, L4-5, Lt.	Root block, L4, 5, Lt.
2	70	F	37	Left	Extraforaminal HNP, L5-S1, Lt.	Transforaminal epidural block, L5-S1, Lt.
3	74	F	36	Both	HNP, L3-4, 4-5, 5-S1	Caudal block medial branch block, L3-4, 4-5, 5-S1, both
4	73	F	35	Both	Spinal stenosis, L3-4, 4-5	Medial branch block, L3-4, 4-5, both
5	76	F	35	Left	HNP, L4-5, Rt.	(1) Decompressive hemilaminectomy, L4, Rt. (2005) (2) Medial branch RFA, L4, 5, Rt. (2006)
6	81	F	22	Right	Spinal stenosis, L3-4, 4-5	PLIF, L3-4, 4-5 (2008)
7	37	F	22	Right	Spinal stenosis, L4-5, L5-S1	Root block, L4, 5, Rt.
8	72	F	21	Left	Spinal stenosis, L5-S1	PLIF, L5-S1 (2001)
9	61	F	15	Left	Spondylolisthesis, L4-5	2014.10.8 MIS TLIF 45 (post-procedure)
10	57	F	13	Right	Spinal stenosis, L4-5	PLIF, L4-5 (2012)
11	48	F	13	Right	HNP, L3-4, Rt.	Transforaminal epidural block, L3-4, Rt.
12	58	F	12	Right	Spondylolisthesis, L3-4	Caudal block, epidural block, L3-4 Trigger point injection of paravertebral muscles
13	56	F	12	Left	HNP, L5-S1, Rt.	Discectomy, L5-S1, Rt. (2013)
14	58	F	10	Both	Facet arthropathy, L4-5, Lt.	Medial branch RFA, L4, 5, Lt. (2013)
15	60	F	9	Both	Spondylolisthesis, L4-5	PLIF, L4-5 (2013)
16	47	M	9	Right	HNP, L5-S1, Lt.	Discectomy, L5-S1, Lt. (2013)
17	69	F	8	Right	Spondylolisthesis, L4-5, L5-S1	PLIF, L4-5, 5-S1 (2008)