Journal of Orthopaedic Surgery and Research

Table 3 Angular parameters of levels with and without posterior heterotopic ossification

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

	non-PHO (n = 101)	PHO (n = 73)	P value
Post-op
Cervical lordosis	13.34 ± 9.90	14.32 ± 11.21	0.541
C2–C7 ROM	28.35 ± 11.03	29.35 ± 11.53	0.711
Shell angle	4.99 ± 4.91	4.08 ± 5.18	0.239
FSU angulation	2.40 ± 4.30	3.33 ± 5.23	0.217
ROM at index level	7.10 ± 3.82	7.37 ± 3.66	0.533
Last follow-up
Cervical lordosis	11.35 ± 8.63	12.85 ± 8.79	0.264
C2–C7 ROM	50.79 ± 13.45	46.33 ± 13.95	0.035*
Shell angle	2.16 ± 5.06	0.97 ± 4.97	0.125
FSU angulation	− 0.47 ± 4.47	0.47 ± 5.06	0.200
ROM at index level	9.12 ± 4.94	7.06 ± 4.51	0.004*
Changes during follow-up
Cervical lordosis	− 1.99 ± 9.03	− 1.47 ± 9.08	0.712
Shell angle	− 2.82 ± 3.78	− 3.10 ± 4.46	0.659
FSU angulation	− 2.87 ± 3.63	− 2.86 ± 3.63	0.988
Insertion angle	1.37 ± 3.87	1.06 ± 4.01	0.144

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

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ISSN: 1749-799X

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