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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-monthBaseline versus 2-year
Clinical outcomeAllograft (n = 53)PEEK (n = 35)Interaction between
Group and Time
GroupTimeInteraction between
Group and Time
GroupTime
 Preoperative6-month2-yearPreoperative6-month2-yearp-valuep-valuep-valuep-valuep-valuep-value
NPD31.2 ± 20.314.0 ± 16.98.8 ± 12.739.7 ± 27.220.6 ± 17.413.4 ± 13.80.6670.063<  0.0010.3650.052<  0.001
NS47.3 ± 26.115.7 ± 22.314.6 ± 21.950.4 ± 29.918.2 ± 18.812.8 ± 14.00.9280.543<  0.0010.6490.929<  0.001
NDI30.4 ± 20.915.1 ± 16.110.4 ± 15.138.5 ± 25.418.5 ± 17.311.4 ± 11.90.2610.145<  0.0010.1260.174<  0.001
VASNP4.8 ± 3.61.3 ± 2.51.0 ± 2.34.4 ± 3.41.9 ± 3.00.9 ± 2.30.2600.778<  0.0010.9390.832<  0.001
VASLP4.1 ± 3.90.8 ± 2.00.9 ± 2.22.7 ± 3.20.5 ± 1.70.2 ± 1.20.1290.107<  0.0010.4510.087<  0.001
JOA13.7 ± 2.015.3 ± 2.115.5 ± 2.111.3 ± 4.314.3 ± 3.514.3 ± 3.20.0110.162< 0.0010.1560.030<  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;