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Table 5 Effects of Sagittal Alignment Parameters on Adjacent Segment Degeneration 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-SASD
(n = 114)
SASD
(n = 18)
P value Non-IASD
(n = 104)
IASD
(n = 28)
P value
Postoperative
 CL (°) 15.9 ± 8.3 12.4 ± 12.4 0.189 16.3 ± 8.2 11.9 ± 10.7 0.048a
 SA (°) 1.7 ± 4.5 −2.1 ± 5.4 0.006a 1.8 ± 4.9 −1.2 ± 3.7 0.001a
 SVA (mm) 17.0 ± 8.1 16.3 ± 4.8 0.740 16.7 ± 8.1 17.5 ± 6.1 0.609
 T1s (°) 28.0 ± 7.1 25.2 ± 3.9 0.020a 28.2 ± 7.1 25.1 ± 5.4 0.034a
 T1s-CL (°) 12.1 ± 7.4 12.8 ± 11.5 0.740 11.9 ± 8.0 13.3 ± 8.2 0.476
Last Follow-up
 CL (°) 13.1 ± 8.0 8.4 ± 9.3 0.026a 13.3 ± 7.8 9.2 ± 9.2 0.018a
 SA (°) −2.2 ± 4.9 −4.0 ± 5.7 0.160 −1.8 ± 5.1 −4.8 ± 3.8 0.001a
 SVA (mm) 16.9 ± 7.2 15.3 ± 6.5 0.482 16.5 ± 6.6 17.3 ± 8.9 0.665
 T1s (°) 23.2 ± 10.3 16.4 ± 10.1 0.004a 24.0 ± 9.5 15.7 ± 11.5 < 0.001a
 T1s-CL (°) 10.1 ± 11.6 8.0 ± 15.4 0.926 10.7 ± 11.5 6.5 ± 14.1 0.212
  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, SASD superior adjacent segment degeneration, IASD inferior adjacent segment degeneration
  2. aSignificant difference between two groups