Efficacy and safety of anterior cervical discectomy and fusion (ACDF) through mini-incision and posterior laminoplasty (LAMP) for treatment of long-level cervical spondylosis: a retrospective cohort study

Table 6 Cervical range-of-motion of Groups A and B

	Group	Preoperative	Postoperative	P value	loss ratio
Flexion	Group A	40.63 ± 4.79	31.25 ± 4.28	0.134	19.65 ± 6.67
	Group B	42.78 ± 5.58	36.85 ± 6.64	0.239	14.62 ± 7.95
	P value	0.862	0.357		0.246
Extension	Group A	38.75 ± 4.65	32.54 ± 7.38	0.147	15.85 ± 8.69
	Group B	39.82 ± 5.85	34.38 ± 6.25	0.132	12.89 ± 4.65
	P value	0.785	0.845		0.345
Lateral bending (L)	Group A	39.69 ± 4.27	31.85 ± 4.41	0.067	17.59 ± 6.54
	Group B	45.65 ± 6.45	37.45 ± 6.68	0.075	17.78 ± 5.36
	P value	0.357	0.247		0.825
Lateral bending (R)	Group A	41.37 ± 7.85	37.85 ± 5.56	0.127	9.75 ± 3.56
	Group B	43.82 ± 6.35	38.15 ± 6.15	0.097	11.54 ± 4.52
	P value	0.687	0.728		0.358
Axial rotation (L)	Group A	72.50 ± 6.58	55.31 ± 8.65	0.125	24.58 ± 6.74
	Group B	77.24 ± 8.41	60.96 ± 9.82	0.238	22.68 ± 7.54
	P value	0.278	0.375		0.534
Axial rotation (R)	Group A	70.59 ± 7.52	53.95 ± 9.54	0.234	24.28 ± 6.15
	Group B	75.65 ± 8.40	61.25 ± 6.96	0.127	18.36 ± 7.96
	P value	0.251	0.287		0.081
Hyperextension and hyperflexion Cervical ROM	Group A	41.5 ± 11.6	26.3 ± 7.6	0.015*	36.58 ± 5.34
	Group B	43.6 ± 12.4	36.2 ± 8.5	0.037*	16.27 ± 4.78
	P value	0.571	0.125		0.021*

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