The influence of L4–S1 Dynesys® dynamic stabilization versus fusion on lumbar motion and its relationship with lumbar degeneration: a retrospective study

Table 3 Summary of X-ray results

	PDS	Fusion	P
Lumbar sagittal Cobb angle
Preoperative	34.53 ± 9.99	37.11 ± 7.85	0.29
Postoperative 2 years	35.60 ± 5.45	37.87 ± 4.96	0.11
Lumbar flexion ROM
Preoperative	26.76 ± 12.50	30.11 ± 9.68*	0.27
Postoperative 2 years	24.69 ± 8.22	19.16 ± 4.20#	0.02
Lumbar extension ROM
Preoperative	8.82 ± 4.50	7.98 ± 2.04	0.37
Postoperative 2 years	7.56 ± 4.26	7.06 ± 2.53	0.60
Lumbar total ROM
Preoperative	35.04 ± 12.95	37.18 ± 10.15*	0.50
Postoperative 2 years	32.10 ± 8.40	26.23 ± 4.79#	0.02
Surgical segment sagittal Cobb angle
Preoperative	23.37 ± 7.54*	24.79 ± 4.61	0.41
Postoperative 2 years	16.34 ± 4.80#	25.08 ± 3.18	<0.01
Surgical flexion ROM
Preoperative	12.97 ± 6.06*	13.23 ± 3.98*	0.85
Postoperative 2 years	4.49 ± 2.39#	1.10 ± 0.65#	<0.01
Surgical extension ROM
Preoperative	4.50 ± 2.67	3.99 ± 1.67*	0.40
Postoperative 2 years	3.14 ± 2.05	1.38 ± 0.90#	<0.01
Surgical total ROM
Preoperative	16.96 ± 7.19*	17.32 ± 5.85*	0.83
Postoperative 2 years	7.10 ± 2.89#	2.38 ± 1.10#	<0.01

P was calculated with independent sample t test. Between preoperative and postoperative, * and # denote significant difference

ISSN: 1749-799X