| within the same foot | 4 | location |
| in their lumbar spine | 3 | location |
| with instrumentation | 2 | other |
| patient → have → fusion | 10 |
| patient → undergo → fusion | 7 |
| patient → had → fusion | 3 |
| negative | neutral | positive |
| 0.206 | 0.634 | 0.159 |
| Raw frequency | 20 |
| Normalized frequency | 0.351 |
| Modifier score | 0.800 |
| Perplexity | 219.133 |