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Table 3
Number and percentage of patients in each of the four groups according to the Hip-Spine Classification.
| Group | 1A | 1B | 2A | 2B | |
|---|---|---|---|---|---|
| Relaxed seated position | Classification | PI-LLA < 10° and ΔSSst-rs > 10° | PI-LLA < 10° and ΔSSst-rs < 10° | PI-LLA > 10° and ΔSSst-rs > 10° | PI-LLA > 10° and ΔSSst-rs < 10° |
| Patients, n (%) | 19 (25) | 7 (9) | 33 (44) | 16 (21) | |
| Straight seated position | Classification | PI-LLA < 10° and ΔSSst-ss > 10° | PI-LLA < 10° and ΔSSst-ss < 10°) | PI-LLA > 10° and ΔSSst-ss > 10° | PI-LLA > 10° and ΔSSst-ss < 10° |
| Patients, n (%) | 11 (15) | 15 (20) | 18 (24) | 31 (41) | |
| Vigdorchik et al. [5] | Patients, n (%) | 987 (47) | 232 (11) | 715 (34) | 147 (7) |
PI-LLA, pelvic incidence minus lumber lordosis angle; ΔSSst-rs, change in sacral slope from the standing to the relaxed seated position; ΔSSst-ss, change in sacral slope from the standing to the straight seated position.
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