T5-T12 kyphosis corrections according to subgroup (+, N, −) and type of rods used.
| Preoperative TK | Postoperative TK | |||||
| Group | Mean ± SD | Range | Mean ± SD | Range | Mean Change (%) | P Value |
| Overall (n = 64) | 20.5° ± 13.4 | 2–50° | 20.3° ± 6.4 | 9–32° | −0.9% | 0.914 |
| Overall CrCo (n = 30) | 19.3° ± 11.9 | 5–44° | 20.6° ± 6.9 | 9–32° | 6.7% | 0.538 |
| Overall TiAl (n = 34) | 21.6° ± 14.8 | 2–50° | 20.1° ± 6.1 | 11–31° | −6.8% | 0.745 |
| LSM+ (n = 10) | 44° ± 3.7 | 41–50° | 27° ± 5.2 | 19–32° | −38.6% | 0.006a |
| CrCo (n = 4) | 42.5° ± 1.7 | 41–44° | 25.5° ± 7.5 | 19–32° | −40% | 0.009a |
| TiAl (n = 6) | 45° ± 4.1 | 41–50° | 28° ± 2.4 | 26–31° | −37.8% | 0.035a |
| LSM N (n = 40) | 19.6° ± 8.2 | 10–31° | 20.5° ± 5.9 | 11–29° | 4.3% | 0.193 |
| CrCo (n = 18) | 21.5° ± 9.3 | 10–31° | 21.1° ± 6.3 | 14–29° | −1.8% | 0.586 |
| TiAl (n = 22) | 17.7° ± 6.9 | 10–28° | 19.5° ± 5.7 | 11–28° | 10.2% | 0.237 |
| LSM− (n = 14) | 6.4° ± 2.6 | 2–9° | 15.3° ± 3.8 | 9–20° | 137.8% | <0.0001a |
| CrCo (n = 8) | 7.8° ± 1.8 | 5–9° | 15.8° ± 4.6 | 9–20° | 103.2% | 0.034a |
| TiAl (n = 6) | 4.7° ± 2.5 | 2–7° | 14.7 ± 2.1 | 13–17° | 214.3% | <0.0001a |
Abbreviations: CrCo, chrome-cobalt; LSM, Lenke sagittal modifier; TiAl, titanium alloy; TK, thoracic kyphosis.
↵a Statistically significant (P < 0.05).