Table 4.

Radiographical outcomes

Variables	AHO Group (n = 17)	Non-AHO Group (n = 80)	P Value
Cervical lordosis (°)
Preoperative	5.3 ± 11.2	6.8 ± 10.8	0.611
Postoperative 3 month	7.9 ± 9.4*	10.2 ± 9.7*	0.384
Last follow-up	8.7 ± 9.1*	11.5 ± 12.3*	0.629
ROM C2-C7 (°)
Preoperative	51.8 ± 15.7	46.9 ± 14.4	0.209
Postoperative 3 month	36.6 ± 9.8*	34.9 ± 10.8*	0.559
Last follow-up	47.7 ± 8.9*	42.7 ± 10.1*	0.148
Arthroplasty Disc Angle (°)
Preoperative	1.7 ± 3.6	2.7 ± 3.5	0.313
Postoperative 3 month	2.2 ± 3.7	2.7 ± 4.5	0.681
Last follow-up	2.1 ± 5.2	3.4 ± 5.5	0.651
Arthroplasty Disc ROM (°)
Preoperative	8.7 ± 3.3	9.4 ± 4.1	0.459
Postoperative 3 month	6.8 ± 4.1*	7.8 ± 4.8*	0.461
Last follow-up	8.1 ± 5.0	9.0 ± 5.1	0.537
Arthroplasty FSU (mm)
Postoperative 1 week AH	27.6 ± 2.5	28.1 ± 2.9	0.496
Postoperative 1 week PH	27.5 ± 2.2	28.3 ± 2.7	0.251
Postoperative 3 month AH	27.3 ± 2.8	27.1 ± 4.0*	0.909
Postoperative 3 month PH	27.8 ± 2.2	28.1 ± 4.0	0.887
Last follow-up AH	26.6 ± 2.3*	27.2 ± 2.5*	0.520
Last follow-up PH	26.9 ± 1.9*	28.0 ± 2.6	0.278
ADA change > 5°	8 (47.1%)	27 (33.8%)	0.405
Prosthesis–endplate depth ratio	0.91	0.90	0.866

AHO anterior heterotopic ossification, ADA arthroplasty disc angle, ROM range of motion, FSU functional spinal unit, AH anterior height, PH posterior height

* P < 0.05, compared with pre-operation or post-operation (1 week)