Unilateral Biportal Endoscopic Discectomy versus Microendoscopic Discectomy for the Treatment of Lumbar Spinal Stenosis: A Systematic Review and Meta-Analysis

Table 1

Characteristics of included studies.

Study	Country	Study design	No. of patients		Gender (M/F)		Age (years)		Follow-up (months)	Duration
			UBED	MED	UBED	MED	UBED	MED
Heo [24]	Korea	PCS	46	42	18/28	16/26	65.8 ± 8.9	63.6 ± 10.5	>12	March 2016 to October 2017
Choi [22]	Korea	RCS	35	30	14/21	17/13	65.4 ± 11.8	65.2 ± 12.0	6	December 2013 to March 2015
Heo [23]	Korea	RCS	37	33	15/22	12/21	66.7 ± 9.4	63.4 ± 11.1	12	March 2016 to December 2017
Kang [26]	Korea	RCT	32	30	18/14	14/16	65.1 ± 8.6	67.2 ± 9.5	6	January 2015 to December 2016
McGrath [28]	USA	RCS	50	45	27/23	27/18	—	—	12	September 2014 to February 2017
Park [30]	Korea	RCT	32	32	13/19	18/14	66.2 (41 – 80)	67.1 (45 – 79)	12	November 2017 to June 2018
Rieger [31]	Germany	PCS	327	413	152/101	178/119	76 ± 10	78 ± 13	12~36	January 2012 to July 2017
Kim [27]	Korea	RCS	30	30	13/17	12/18	64.23 ± 5.26	66.20 ± 6.01	12	September 2015 to March 2017
Min [29]	Korea	RCT	54	35	27/27	19/16	65.74 ± 10.52	66.74 ± 7.96	>36	March 2015
Ito [25]	Japan	RCS	42	139	28/14	71/68	66.3 ± 12.3	65.0 ± 11.1	>6	November 2018 to June 2019

UBED, unilateral biportal endoscopic discectomy; MED, microendoscopic discectomy; PCS, prospective cohort study; RCS, retrospective cohort study; RCT, randomized controlled trial.