TABLE 5.
Occipitocervical Arthrodesis Failure Rates by Graft Group
| Graft group | No fail (%) | Fail (%) | Total | P-value |
|---|---|---|---|---|
| Age = Adult (>18 yr) | ||||
| Structural autograft (Group 1) | 37 (94.9) | 2 (5.1) | 39 | |
| Structural allograft (Group 2) | 13 (100.0) | 0 (0.0) | 13 | |
| Nonstructural, any (Group 3) | 76 (89.4) | 9 (10.6) | 85 | |
| None documented (Group 4) | 31 (86.1) | 5 (13.9) | 36 | |
| Total | 157 (90.8) | 16 (9.2) | 173 | .46 |
| Age = Child (0-18 yr) | ||||
| Structural autograft (Group 1) | 20 (74.1) | 7 (25.9) | 27 | |
| Structural allograft (Group 2) | 3 (75.0) | 1 (25.0) | 4 | |
| Nonstructural, any (Group 3) | 15 (93.8) | 1 (6.3) | 16 | |
| None documented (Group 4) | 9 (81.8) | 2 (18.2) | 11 | |
| Total | 47 (81.0) | 11 (18.9) | 58 | .40 |