The clinical efficacy of laminectomy fusion fixation and posterior single open-door laminoplasty in the treatment of multilevel cervical ossification of the posterior longitudinal ligament (OPLL): a retrospective study

Table 3 Comparison of CCI, C2 -7 SVA, ROM between the two groups before and after operation (mean ± SD)

Index	Point-in-time	Lanminectomy group	Laminoplasty group	T value	P value
CCI	Pre-operation	12.73 ± 1.79	12.65 ± 1.50	0.947	P > 0.05
	Last follow-up	17.36 ± 1.78	10.72 ± 1.63	3.679	P < 0. 05
CCI change		5.38 ± 1.25	− (1.93 ± 1.27)	1.179	P<0. 05
	T value	10.637	3.245
	P value	P < 0. 05	P < 0. 05
C2-7 SVA	Pre-operation	18.13 ± 4.20	21.94 ± 3.18	3.274	P > 0. 05
	Last follow-up	25.00 ± 3.82	16.41 ± 2.78	16.285	P < 0. 05
C2-7 SVA change		7.81 ± 2.80	− (8.58 ± 2.91)	13.491	P < 0. 05
	T value	10.235	18.642
	P value	P < 0. 05	P < 0. 05
ROM	Pre-operation	26.58 ± 3.50	28.06 ± 3.79	2.798	P > 0. 05
	Last follow-up	13.36 ± 3.78	22.95 ± 2.71	36.251	P < 0. 05
ROM change		13.23 ± 4.35	5.10 ± 3.23	12.350	P < 0. 05
	T value	3.0725	16.329
	P value	P < 0. 05	P < 0. 05

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