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Table 3 Radiological outcomes between the allograft and PEEK groups

From: A comparison of contiguous two-level anterior cervical discectomy and fusion using a structural allograft versus a Polyetheretherketone (PEEK) cage: the results of a three-year follow-up

Cephalad level

    

Pre-op versus first post-op

First post-op versus final post-op

Radiological Outcome

Allograft (n = 53)

PEEK (n = 35)

Interaction

(Group*Time)

Group

Time

Interaction

(Group*Time)

Group

Time

 

Preop

1st post-op

Final postop

Preop

1st post-op

Final postop

p-value

p-value

p-value

p-value

p-value

p-value

Mean Disc Height

3.47 ± 1.07

6.51 ± 0.89

5.46 ± 0.89

3.97 ± 1.25

6.63 ± 0.98

5.64 ± 0.91

0.173

0.088

<  0.001

0.848

0.327

<  0.001

Segmental Height

31.32 ± 3.66

33.23 ± 3.44

32.66 ± 3.41

31.57 ± 4.11

33.50 ± 3.69

32.14 ± 3.46

0.947

0.741

<  0.001

0.002

0.490

*0.004

^< 0.001

Segmental Cobb Angle

−1.19 ± 5.83

1.89 ± 3.82

0.46 ± 4.19

2.30 ± 6.66

2.53 ± 4.52

1.20 ± 3.94

0.034

0.477

*< 0.001

^0.852

0.954

0.361

0.004

Cervical Cobb Angle

7.24 ± 11.97

11.75 ± 10.41

11.37 ± 9.80

10.96 ± 9.80

10.46 ± 7.80

11.02 ± 8.03

0.014

0.532

*< 0.001

^0.759

0.519

0.623

0.999

Caudal level

    

Pre-op versus first post-op

First post-op versus final post-op

Radiological Outcome

Triad (n = 53)

Peek (n = 35)

Interaction

(Group*Time)

Group

Time

Interaction

(Group*Time)

Group

Time

 

Preop

1st post-op

Final postop

Preop

1st post-op

Final postop

p-value

p-value

p-value

p-value

p-value

p-value

Mean Disc Height

3.58 ± 1.09

6.51 ± 1.09

5.40 ± 0.92

3.76 ± 1.74

6.57 ± 1.06

5.72 ± 1.11

0.680

0.581

<  0.001

0.384

0.272

<  0.001

Segmental height

32.27 ± 3.51

33.94 ± 3.43

33.05 ± 3.41

31.10 ± 3.41

33.14 ± 3.50

31.65 ± 2.94

0.340

0.292

<  0.001

0.017

0.050

< 0.001

Segmental Cobb angle

3.41 ± 4.77

6.95 ± 4.38

4.00 ± 4.92

2.25 ± 6.06

6.04 ± 4.74

3.25 ± 5.26

0.811

0.280

<  0.001

0.895

0.376

<  0.001

  1. Mean ± SD. Two-way Repeated Measures ANOVA. Interaction and main effects of groups and time of measurement were assessed. Significance level was set at p < 0.05
  2. *Allograft
  3. ^PEEK
  4. Preop, preoperative; post-op, postoperation,