Journal of Orthopaedic Surgery and Research

Table 7 Radiographic parameters between low CP group and high CP group

From: Effects of endplate coverage and intervertebral height change on heterotopic ossification following cervical disc replacement

	CP < 84.88 (n = 58)	CP ≥ 84.88 (n = 116)	P value
PHO	45	28	< 0.001*
Motion-restricting PHO	19	6	0.069
Post-op
Cervical lordosis	12.12 ± 9.91	14.57 ± 10.66	0.211
ROM C2–C7	29.51 ± 11.55	28.40 ± 11.08	0.677
Shell angle	4.70 ± 5.24	4.56 ± 4.95	0.632
FSU angulation	3.20 ± 4.97	2.59 ± 4.60	0.424
ROM at index level	8.07 ± 4.07	6.78 ± 3.52	0.029*
Last follow-up
Cervical lordosis	11.92 ± 8.70	12.01 ± 8.74	0.945
ROM C2–C7	44.83 ± 13.96	50.96 ± 13.31	0.018*
Shell angle	1.83 ± 5.78	1.58 ± 4.66	0.759
FSU angulation	0.69 ± 4.75	− 0.46 ± 4.70	0.134
ROM at index level	6.89 ± 4.70	8.94 ± 4.82	0.004*
Anterior bone loss	32	75	0.226
Changes during follow-up
Cervical lordosis	− 0.20 ± 8.70	− 2.56 ± 9.12	0.104
Shell angle	− 2.87 ± 3.96	− 2.98 ± 4.14	0.874
FSU angulation	− 2.51 ± 3.61	− 3.04 ± 3.63	0.263
Insertion angle	0.85 ± 4.64	1.43 ± 3.51	0.260

*Significant difference between two groups
CP, combined parameter; PHO, posterior heterotopic ossification; post-op, values at 1 week after surgery; FSU, functional spinal unit; ROM, range of motion

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ISSN: 1749-799X

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