Comparison of Fusion Rates between Glycerol-Preserved and Frozen Composite Allografts in Cervical Fusion
Table 2
Fusion rates by numbers of levels*.
Frozen
Glycerol-preserved
Frozen versus glycerol statistically similar?
Total levels
Fused grafts
Not fused
% of fused levels
Total levels
Fused grafts
Not fused
% of fused levels
Three months
Total
70
29
41
41.4%
64
29
35
45.3%
Yes
1 level
12
6
6
50.0%
4
1
3
25.0%
Yes
2 levels
40
17
23
42.5%
32
13
19
40.6%
Yes
3 levels
18
6
12
33.3%
24
11
13
45.8%
Yes
4 levels
0
0
0
—
4
4
0
100%
—
12 months
Total
45
45
0
100.0%
41
41
0
100%
Yes
1 level
8
8
0
100.0%
2
2
0
100%
Yes
2 levels
25
25
0
100.0%
17
17
0
100%
Yes
3 levels
12
12
0
100.0%
18
18
0
100%
Yes
4 levels
0
0
0
—
4
4
0
100%
—
Note that 2-level patients had both glycerol-preserved and frozen grafts. The results from those patients were counted as 1 level in each 2-level treated group.
