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Table 3 Comparisons of radiologic parameters

From: Comparison among perfect-C®, zero-P®, and plates with a cage in single-level cervical degenerative disc disease

  Perfect-C
(n = 41)
Zero-P
(n = 36)
Plate-Cage
(n = 71)
P-value
Cervical alignment (°)
 Preoperation 12.39 ± 6.78 12.49 ± 7.06 14.11 ± 9.24 0.457
 Postoperation 17.35 ± 7.87# 16.47 ± 8.03# 15.28 ± 9.6# 0.471
 Last follow-up 20.57 ± 8.54# 18.41 ± 8.11# 17.76 ± 9.85# 0.455
Segmental angle (°)
 Preoperation 5.81 ± 3.8 4.94 ± 3.89 4.59 ± 3.98 0.285
 Postoperation 6.1 ± 4.49# 5.25 ± 3.15# 5.41 ± 3.07# 0.514
 Last follow-up 6.59 ± 6.17# 5.34 ± 3.69# 5.34 ± 3.06# 0.294
Intervertebral height (mm)
 Preoperation 5.48 ± 1.48 5.93 ± 1.01 5.75 ± 1.21 0.284
 Postoperation 7.81 ± 1.31# 7.56 ± 1.01# 7.62 ± 1.12# 0.58
 Last follow-up 6.77 ± 1.49# 6.48 ± 1.17# 6.22 ± 1.14# 0.082
Subsidence 5 (14%) 9 (25%) 15 (21%) 0.546
Fusion 37 (90%) 31 (86%) 68 (95%) 0.284
Prevertebral soft-tissue
Thickness (mm)     
 Preoperation 15.27 ± 2.88 12.17 ± 3.32 13.15 ± 3.29  
 Postoperation 18.59 ± 3.34# 15.4 ± 3.63# 18.97 ± 3.91#  
 Last follow-up 14.91 ± 2.96# 11.86 ± 3.1# 15.01 ± 3.95#  
PDD (Cephalad, mm) 10.52 ± 2.12 13.72 ± 2.11 5.33 ± 2.09 < 0.001*
PDD (Caudal, mm) 11.83 ± 2.31 14.89 ± 1.58 6.03 ± 1.99 < 0.001*
PDD / ABH (Cephalad) 0.74 ± 0.09 1 0.38 ± 0.12 < 0.001*
PDD / ABH (Caudal) 0.77 ± 0.05 1 0.39 ± 0.11 < 0.001*
HO 0 0 21 (30%) < 0.001*
  1. PDD plate-to-disc distance, ABH anterior body heights, HO heterotopic ossification
  2. *P < 0.05, comparison among the Perfect-C, Zero-P, and Plate-Cage groups
  3. #P < 0.05, comparison with the preoperative value