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Table 2 Clinical outcomes between the allograft and PEEK group

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

     

Baseline versus 6-month

Baseline versus 2-year

Clinical outcome

Allograft (n = 53)

PEEK (n = 35)

Interaction between

Group and Time

Group

Time

Interaction between

Group and Time

Group

Time

 

Preoperative

6-month

2-year

Preoperative

6-month

2-year

p-value

p-value

p-value

p-value

p-value

p-value

NPD

31.2 ± 20.3

14.0 ± 16.9

8.8 ± 12.7

39.7 ± 27.2

20.6 ± 17.4

13.4 ± 13.8

0.667

0.063

<  0.001

0.365

0.052

<  0.001

NS

47.3 ± 26.1

15.7 ± 22.3

14.6 ± 21.9

50.4 ± 29.9

18.2 ± 18.8

12.8 ± 14.0

0.928

0.543

<  0.001

0.649

0.929

<  0.001

NDI

30.4 ± 20.9

15.1 ± 16.1

10.4 ± 15.1

38.5 ± 25.4

18.5 ± 17.3

11.4 ± 11.9

0.261

0.145

<  0.001

0.126

0.174

<  0.001

VASNP

4.8 ± 3.6

1.3 ± 2.5

1.0 ± 2.3

4.4 ± 3.4

1.9 ± 3.0

0.9 ± 2.3

0.260

0.778

<  0.001

0.939

0.832

<  0.001

VASLP

4.1 ± 3.9

0.8 ± 2.0

0.9 ± 2.2

2.7 ± 3.2

0.5 ± 1.7

0.2 ± 1.2

0.129

0.107

<  0.001

0.451

0.087

<  0.001

JOA

13.7 ± 2.0

15.3 ± 2.1

15.5 ± 2.1

11.3 ± 4.3

14.3 ± 3.5

14.3 ± 3.2

0.011

0.162

< 0.001

0.156

0.030

<  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. ROM Range of motion; NPD Neck pain and disability; AAOS-NS AAOS neurogenic symptom score; NDI Neck Disability Index; VASNP Visual analog score neck pain; VASLP Visual analog score limp pain; JOA Japanese Orthopedic Association Score;