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Summary of patient demographic and preoperative clinical characteristics
| Characteristic | Case | |
|---|---|---|
| Group A (n = 10) | Group B (n = 8) | |
| Sex (M:F) | 3:7 | 5:3 |
| Mean age in yrs (range) | 61.0 (48-72) | 60.5 (48-69) |
| Spinal level | ||
| L3-4 | 1 | 1 |
| L4-5 | 7 | 5 |
| L3-4-5 | 2 | 1 |
| L4-5-S1 | 0 | 1 |
