Table 3. Summary of the VAS results from the BioSphere Putty ACDF procedures grouped by follow-up period and number of operated levels.
| VAS follow-up period | # of patients | # of levels | Pre-op Avg. | 1-year Avg. | 1-year % decrease | 24-month Avg. | 2-year % decrease |
|---|---|---|---|---|---|---|---|
| 1-year ACDF | 25 | 1 | 5.8 | 1.1 | 81% | N/A | N/A |
| 46 | 2 | 6.6 | 1.5 | 77% | |||
| 18 | 3 | 6.0 | 1.2 | 80% | |||
| 6 | 4 | 7.3 | 2.5 | 66% | |||
| 1-year overall results | 95 | 1–4 | 6.3 | 1.4 | 78% | ||
| 2-year ACDF | 2 | 1 | 2.5 | 0.0 | 100% | 0.0 | 100% |
| 10 | 2 | 7.9 | 1.1 | 86% | 0.4 | 95% | |
| 7 | 3 | 6.3 | 0.6 | 90% | 0.1 | 98% | |
| 1 | 4 | 7.0 | 0.0 | 100% | 0.0 | 100% | |
| 2-year overall results | 20 | 1–4 | 6.8 | 0.8 | 88% | 0.3 | 96% |
VAS, visual analog pain; ACDF, anterior cervical decompression and fusion.