Adjacent segment disease following Dynesys stabilization for lumbar disorders: A case series of mid- and long-term follow-ups

Table 2 Baseline characteristics of participants who did and did not undergo reoperation

Characteristics	No reoperation (n = 199)				Reoperation (n = 13)				Total patients (n = 212)
	n	Mean	min	Mean	n	Mean	min	Max	n	Mean	min	Max
Before Dynesys surgery
Upper adjacent modified Pfirrmann grade	194	3.19	1	6	12	3.17	2	5	206	3.19	1	6
Upper UCLA classification	199	2.11	1	4	13	2.08	1	4	212	2.10	1	4
Before reoperation
Upper adjacent modified Pfirrmann grade	/	/	/	/	12	4.58	2	7	/	/	/	/
Upper UCLA classification	/	/	/	/	13	2.77	1	4	/	/	/	/
Age	199	60.89	21	82	13	59.15	41	81	212	60.78	21	82
Male	72	--	--	--	4	--	--	--	76
Female	127	/	/	/	9	/	/	/	136	/	/	/
VAS score, back	/	7.67	0	10	/	7.75	5	10	/	7.67	0	10
VAS score, leg	/	8.01	2	10	/	7.67	6	10	/	7.98	2	10
BMI	/	26.16	16	38.7	/	28.28	22.9	36.6	/	26.29	16	38.7
Preoperative ODI	189	30.04	9	48	/	30.08	22	37	/	30.04	9	48
Last imaging follow-up yr (before reoperation)	199	6.09	0.10	12.76	/	7.22	1.65	11.84	/	6.16	0.10	12.76

Data are shown as the mean and minimum and maximum values. BMI: Body mass index; ODI: Oswestry Disability Index; UCLA: University of California-Los Angeles; VAS: Visual analog scale.