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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-opFirst post-op versus final post-op
Radiological OutcomeAllograft (n = 53)PEEK (n = 35)Interaction
(Group*Time)
GroupTimeInteraction
(Group*Time)
GroupTime
 Preop1st post-opFinal postopPreop1st post-opFinal postopp-valuep-valuep-valuep-valuep-valuep-value
Mean Disc Height3.47 ± 1.076.51 ± 0.895.46 ± 0.893.97 ± 1.256.63 ± 0.985.64 ± 0.910.1730.088<  0.0010.8480.327<  0.001
Segmental Height31.32 ± 3.6633.23 ± 3.4432.66 ± 3.4131.57 ± 4.1133.50 ± 3.6932.14 ± 3.460.9470.741<  0.0010.0020.490*0.004
^< 0.001
Segmental Cobb Angle−1.19 ± 5.831.89 ± 3.820.46 ± 4.192.30 ± 6.662.53 ± 4.521.20 ± 3.940.0340.477*< 0.001
^0.852
0.9540.3610.004
Cervical Cobb Angle7.24 ± 11.9711.75 ± 10.4111.37 ± 9.8010.96 ± 9.8010.46 ± 7.8011.02 ± 8.030.0140.532*< 0.001
^0.759
0.5190.6230.999
Caudal level    Pre-op versus first post-opFirst post-op versus final post-op
Radiological OutcomeTriad (n = 53)Peek (n = 35)Interaction
(Group*Time)
GroupTimeInteraction
(Group*Time)
GroupTime
 Preop1st post-opFinal postopPreop1st post-opFinal postopp-valuep-valuep-valuep-valuep-valuep-value
Mean Disc Height3.58 ± 1.096.51 ± 1.095.40 ± 0.923.76 ± 1.746.57 ± 1.065.72 ± 1.110.6800.581<  0.0010.3840.272<  0.001
Segmental height32.27 ± 3.5133.94 ± 3.4333.05 ± 3.4131.10 ± 3.4133.14 ± 3.5031.65 ± 2.940.3400.292<  0.0010.0170.050< 0.001
Segmental Cobb angle3.41 ± 4.776.95 ± 4.384.00 ± 4.922.25 ± 6.066.04 ± 4.743.25 ± 5.260.8110.280<  0.0010.8950.376<  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,