Table 2.
Surgical procedure
| Variable | RhBMP-2 cohort (n = 64) | Control group (n = 40) | P value* | ||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Single level surgery | 31 | 48.4 | 23 | 57.5 | 0.423 |
| L2/L3 | 1 | 1.6 | 0 | 0.0 | 1.000 |
| L3/L4 | 1 | 1.6 | 1 | 2.5 | 1.000 |
| L4/L5 | 13 | 20.3 | 9 | 22.5 | 0.809 |
| L5/S1 | 16 | 25.0 | 11 | 27.5 | 0.821 |
| Multi-level surgery | 33 | 51.6 | 18 | 45.0 | 0.550 |
| L2–L5 | 3 | 4.7 | 0 | 0.0 | 0.283 |
| L3–L5 | 3 | 4.7 | 3 | 7.5 | 0.673 |
| L3–S1 | 0 | 0.0 | 1 | 2.5 | 0.394 |
| L3–pelvis | 1 | 1.6 | 0 | 0.0 | 1.000 |
| L4–S1 | 23 | 35.9 | 14 | 35.0 | 1.000 |
| T–L4/5 | 3 | 4.7 | 0 | 0.0 | 0.283 |
| Inter-body cage | 19 | 29.7 | 10 | 25.0 | 0.659 |
| rhBMP-2 | |||||
| Cage rhBMP-2 | 19 | 28.1 | 0 | 0.0 | >1 |
| Posterolateral rhBMP-2 | 64 | 100.0 | 0 | 0.0 | >1 |
| Cage Healos® | 0 | 0.0 | 3 | 7.5 | 0.054 |
The lumbo-sacral operative level was similar in both treatment groups. The majority of surgery was performed at L4/L5 and or L5/S1 in both groups
* P values for categorical variables were generated using Fischer’s exact test