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Patient demography and baseline characteristics
| Characteristics | |
|---|---|
| Male/female (n) | 3/10 |
| Mean age (range) (years) | 39 (27–49) |
| Pre-operative disc pathology (n) | |
| L4/L5 | 9 |
| L5/S1 | 4 |
| Pre-operative vertebral endplate pathology (n) | |
| Monosegmental osteochondritis | 10 |
| Bisegmental osteochondritis | 3 |
| Pre-operative facet integrity (n) | |
| Class 0 | 1 |
| Class 0–I | 1 |
| Class I | 2 |
| Class I–II | 6 |
| Class II | 3 |
| Previous surgery (n) | |
| Nucleotomy at operating level | 5 |
