Journal of Orthopaedic Surgery and Research

Table 6 Radiographic parameters between low disc height change group and high disc height change group

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

	Disc height change < 1.80 (n = 67)	Disc height change ≥ 1.80 (n = 107)	P value
PHO	13	60	< 0.001*
Motion-restricting PHO	2	23	0.196
Post-op
Cervical lordosis	13.19 ± 10.58	14.11 ± 10.40	0.497
ROM C2–C7	30.41 ± 12.02	27.75 ± 10.61	0.131
Shell angle	3.71 ± 4.70	5.17 ± 5.17	0.063
FSU angulation	2.13 ± 4.03	3.20 ± 5.08	0.145
ROM at index level	7.59 ± 3.71	6.98 ± 3.77	0.316
Last follow-up
Cervical lordosis	9.93 ± 8.90	13.27 ± 8.37	0.013*
ROM C2–C7	49.49 ± 14.06	48.56 ± 13.69	0.664
Shell angle	1.68 ± 4.87	1.66 ± 5.17	0.982
FSU angulation	− 0.66 ± 4.78	0.29 ± 4.69	0.198
ROM at index level	8.61 ± 5.02	8.04 ± 4.77	0.588
Anterior bone loss	40	67	0.701
Changes during follow-up
Cervical lordosis	− 3.26 ± 9.12	− 0.84 ± 8.89	0.086
Shell angle	− 2.03 ± 3.77	− 3.51 ± 4.16	0.019*
FSU angulation	− 2.79 ± 3.19	− 2.91 ± 3.88	0.817
Insertion angle	0.97 ± 3.77	1.41 ± 4.03	0.462

*Significant difference between two groups
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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