Table 8. MacNab outcomes versus type and size of disc herniation (HNP).
| Herniation characteristics | Modified MacNab outcomes | Total | |||
|---|---|---|---|---|---|
| Excellent | Fair | Good | Poor | ||
| HNP type | |||||
| Central | 14 | 4 | 9 | 0 | 27 |
| Extrusion | 5 | 2 | 2 | 1 | 10 |
| Foraminal | 3 | 1 | 4 | 1 | 9 |
| Paracentral | 4 | 0 | 5 | 0 | 9 |
| Total | 26 | 7 | 20 | 2 | 55 |
| HNP size | |||||
| <10 mm | 15 | 2 | 13 | 0 | 30 |
| >10 mm | 11 | 5 | 7 | 2 | 25 |
| Total | 26 | 7 | 20 | 2 | 55 |
| Facet joint status | |||||
| Normal | 13 | 4 | 11 | 2 | 30 |
| Degeneration | 13 | 3 | 9 | 0 | 25 |
| Total | 26 | 7 | 20 | 2 | 55 |
| Other factors | |||||
| None | 22 | 2 | 12 | 1 | 37 |
| Annular tear | 0 | 0 | 1 | 0 | 1 |
| Diabetes | 0 | 0 | 1 | 0 | 1 |
| Alcohol abuse | 0 | 0 | 1 | 0 | 1 |
| Fibromyalgia | 0 | 1 | 0 | 0 | 1 |
| Spondylolisthesis | 0 | 0 | 1 | 0 | 1 |
| Psych | 0 | 2 | 2 | 0 | 4 |
| Smoking | 4 | 2 | 2 | 1 | 9 |
| Total | 26 | 7 | 20 | 2 | 55 |
HNP, herniated nucleus pulposus.