Table 2.

The number of planned and unplanned surgical procedures in the traditional growing rods group

Ref.	Subject	Surgical procedures (n)	Planned surgical procedures (n)	Unplanned surgical procedure		% unplanned surgeries to all surgeries	% unplanned surgery to patients with at least one complication	Ratio of planned to unplanned surgery
				n	%
Bess et al[15], 2010	140	897	823	74	52.92	8.22	91.42	11.12
Du et al[16], 2020	167	199	167	32	19.23	16.13	100.03	5.22
Andras et al[13], 2015	36	288	259	29	80.6	10.1	100.0	8.9
Myung et al[17], 2014	159	10811	10501	311	19.5	2.9	83.8	33.87
Arandi et al[18], 2014	175	12471	1190	571	32.6	4.6	71.3	20.88
Liang et al[19], 2015	55	272	263	231	41.82	8.52	100.02	11.43
Ramirez et al[20], 2020	67	4631	3961	67	100	14.5	163.4	5.91
Poe-Kochert et al[22], 2016	100	1571	1001	57	573	36.33	285.03	1.75
Kabirian e et al[23], 2014	379	2344	22741	70	18.5	3.0	166.7	32.49
Luhmann et al[14], 2017	18	167	141	26	144.4	15.6		5.42
Akbarnia et al[10], 2014	12	73	68	5	41.7	6.8	45.5	13.6
Harris et al[8], 2020	353	31411	28951	246	69.7	7.8	174.5	11.77
Helenius et al[9], 2018	214	1971	1836	133	62.1	6.7	137.1	13.8

¹Data estimated based on the mean values of duration between lengthenings.

²The values of the % of unplanned surgeries in which all four complications were analyzed in the paper.

³Corresponds to the papers in which all the patients were after the final fusion.