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
Allograft
(n = 53)
Peek
(n = 35)
p-value
Cephalad level
Fusion
51 (98.1)
35 (100)
1.000
Subsidence
4 (7.7)
8 (22.9)
0.057
Caudal level
49 (94.2)
0.270
8 (15.4)
13 (37.1)
0.020