Percentages of patients within each age cohort and overall who matched age-adjusted ideals (MATCH), those that undercorrected (UNDER) and those that overcorrected (OVER), based upon a ±10-y interval of age-adjusted values calculated with Renaud et al’s established formulas.Differences in lower extremity compensatory mechanisms (SFA, KA, AA, PS, GSA) by age group.
| Age Adjustment Ideals | UNDER | Under Overall | MATCH | Match Overall | OVER | Over Overall |
| Pelvic tilt (°) | ||||||
| <40 y | 0% | 24.40% | 28.6% | 24.40% | 71.4% | 51.10% |
| 40–65 y | 19.4% | 27% | 53.2% | |||
| ≥65 y | 47.6% | 14.3% | 38.1% | |||
| Mismatch between pelvic tilt-lumbar lordosis (°) | ||||||
| <40 y | 25% | 23.00% | 0% | 27.60% | 75% | 49.40% |
| 40–65 y | 22.6% | 27.4% | 50% | |||
| ≥65 y | 23.8% | 33.3% | 42.9% | |||
| Sagittal vertical axis (mm) | ||||||
| <40 y | 42.9% | 18.80% | 57.1% | 40.00% | 0% | 41.30% |
| 40–65 y | 18.5% | 40.7% | 40.7% | |||
| ≥65 y | 10.5% | 31.6% | 57.9% | |||
| Mismatch between lumbar lordosis and thoracic kyphosis (°) | ||||||
| <40 y | 85.7% | 42.90% | 14.3% | 18.70% | 0% | 38.50% |
| 40–65 y | 46.0% | 25.4% | 28.6% | |||
| ≥65 y | 19% | 0% | 81% | |||