Clinical and radiographic findings of the patients.
| Cobalt-Chrome Group (n = 30) | Titanium Alloy Group (n = 34) | ||||
| Variable | Mean ± SD | Range | Mean ± SD | Range | P Value |
| Sex, n | F: 26, M: 4 | F: 28, M: 6 | |||
| Age, y | 14.6 ± 2.3 | 11–18 | 15.5 ± 1.9 | 12–18 | 0.258 |
| Follow-up, y | 2.2 ± 0.2 | 2–2.4 | 2.1 ± 0.4 | 2–2.9 | 0.833 |
| No. of fused levels | 11.1 ± 1.2 | 10–13 | 11.2 ± 0.8 | 10–13 | 0.941 |
| Screw density, No. of screws / No. of instrumented vertebrae | 1.8 ± 0.2 | 1.7–2 | 1.8 ± 0.1 | 1.6–2 | 0.912 |
| Lenke lumbar modifier | 14A, 14B, 2C | 16A, 15B, 3C | 0.620 | ||
| LSM | 8+, 18N, 4− | 6+, 22N, 6− | 0.589 | ||
| Preoperative MT Cobb’s angle | 60.3° ± 15.5 | 39–96° | 65.6° ± 10.6 | 50–85° | 0.116 |
| Side-bending correction index, % | 30.1% ± 22.7 | 12–54% | 32.4% ± 16.3 | 17–51% | 0.652 |
| Ponte osteotomies, % of instrumented levels | 13.5% (45/333) | 15.5% (59/381) | 0.897 | ||
| Postoperative MT Cobb’s angle | 16.1° ± 6.1 | 7–28° | 22.8° ± 8.3 | 6–38° | <0.001a |
| Coronal correction, % | 73.6% ± 7.4 | 60.3–86.2% | 65.5% ± 11 | 46.4–88% | 0.001a |
| Last FU MT Cobb’s angle, % | 16.6° ± 6.5 | 9–34° | 23.4° ± 8 | 12–36° | 0.421 |
| Coronal loss of correction at last FU, % | 0.5° ± 1.4 | −2 to 5° | 0.6° ± 1.6 | −1 to 7° | 0.816 |
| Preoperative TK | 19.3° ± 11.9 | 5–44° | 21.6° ± 14.8 | 2–50° | 0.507 |
| LSM+ | 42.5° ± 1.7 | 41–44° | 45° ± 4.1 | 41–50° | 0.289 |
| LSM− | 7.7° ± 1.7 | 5–9° | 4.7 ± 2.5 | 2–7° | 0.021a |
| Postoperative TK | 20.6° ± 6.9 | 9–32° | 20.1° ± 6.1 | 11–31° | 0.768 |
| LSM+ | 25.5° ± 7.5 | 19–32° | 28° ± 2.4 | 26–31° | 0.565 |
| LSM− | 15.8° ± 4.6 | 9–20° | 14.7° ± 2.1 | 13–17° | 0.600 |
| Pre- to postoperative TK change | 1.3° ± 7.6 (6.6%) | −12 to 15° | 1.5° ± 11 (−6.8%) | −22 to 14° | 0.933 |
| LSM+ | −17° ± 5.8 (−40%) | −22 to 12° | −17 ± 1.8 (−37.8%) | −19 to 15° | 0.999 |
| LSM− | 8° ± 6 (103.23%) | 6–15° | 10° ± 2 (214.29%) | 8–12° | 0.038a |
| Last FU TK | 21.1° ± 7 | 8–34° | 21.6° ± 7.1 | 11–37° | 0.770 |
| LSM+ | 27.3° ± 7.9 | 19–34° | 31.3° ± 3.1 | 26–31° | 0.397 |
| LSM− | 15.8° ± 5.1 | 8–20° | 13.5° ± 1.5 | 11–15° | 0.171 |
| Postoperative to last FU TK change | 0.5° ± 1.5 (2.3%) | −3 to 4° | 1.5° ± 3 (7.3%) | −2 to 6° | 0.032a |
| LSM+ | 1.8° ± 1.3 (6.9%) | 0–3° | 3.3° ± 2.5 (11.9%) | −1 to 6° | 0.282 |
| LSM− | 0° ± 0.9 (0%) | −1 to 2° | −1.2° ± 1 (−8%) | −2 to 0° | 0.060 |
Abbreviations: F, female; FU, follow-up; LMS, Lenke sagittal modifier; M, male; MT, main thoracic; TK, thoracic kyphosis.
↵a Statistically significant (P < 0.05).