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X-ray films selected (in number of patients and % of the sample size) for different periods of the follow-up
| Type of X-ray films | Before surgery (sample size 49) | Short term (sample size 49) | Mid-term (sample size 49) | Long term (sample size 38) | Last follow-up 100% available (years) |
|---|---|---|---|---|---|
| Sagittal standing | 28 (57%) | 30 (60%) | 30 (60%) | 26 (68%) | 3 ± 0.5 |
| Lumbar dynamic (flexion-extension) | 19 (39%) | 39 (76%) | 45 (92%) | 37 (97%) | 4 ± 1.5 |
