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Table 4 Effects of Sagittal Alignment Parameters on Heterotopic Ossification After Cervical Disc Replacement

From: Cervical sagittal alignment after Prestige LP cervical disc replacement: radiological results and clinical impacts from a single-center experience

Variable Non-AHO
(n = 94)
AHO
(n = 38)
P value Non-PHO
(n = 82)
PHO
(n = 50)
P value
Postoperative
 CL (°) 16.2 ± 8.8 13.3 ± 9.1 0.087 15.2 ± 8.9 15.7 ± 9.1 0.778
 SA (°) 1.3 ± 5.4 0.7 ± 2.9 0.310 0.8 ± 4.4 1.8 ± 5.4 0.255
 SVA (mm) 15.5 ± 7.3 20.4 ± 7.7 0.003a 17.3 ± 7.6 16.2 ± 7.9 0.368
 T1s (°) 27.5 ± 7.3 27.8 ± 5.7 0.710 27.6 ± 6.8 27.5 ± 6.9 0.659
 T1s-CL (°) 11.2 ± 8.4 14.5 ± 6.5 0.014a 12.4 ± 8.0 11.8 ± 8.2 0.573
Last Follow-up
 CL (°) 12.9 ± 8.1 11.4 ± 8.6 0.439 12.4 ± 8.3 12.6 ± 8.3 0.881
 SA (°) −2.3 ± 5.3 −2.8 ± 4.1 0.615 −3.2 ± 4.8 −1.1 ± 5.1 0.020a
 SVA (mm) 15.2 ± 5.9 20.3 ± 8.5 0.001a 17.6 ± 8.0 15.1 ± 5.0 0.032a
 T1s (°) 23.0 ± 9.8 20.4 ± 11.9 0.415 22.8 ± 11.1 21.5 ± 9.5 0.458
 T1s-CL (°) 10.1 ± 11.7 9.0 ± 13.3 0.833 10.4 ± 11.2 8.9 ± 13.7 0.940
  1. CL C2–7 lordosis, SA segmental angle, SVA sagittal vertical axis, T1s T1 slope, T1s-CL T1 slope minus C2–7 lordosis, NDI neck disability index, AHO anterior heterotopic ossification, PHO posterior heterotopic ossification
  2. aSignificant difference between two groups