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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