Preoperative and follow-up radiographic curve behavior of instrumented major curve, noninstrumented compensatory curve, and T5-T12 kyphosis.
| Variable | Skeletally Immature (Risser 0 to 2) | Skeletally Mature (Risser 3 to 5) | P Value |
| Skeletal maturity at final follow-up | |||
| Risser, median (range) | 4 (1–5) | 5 (4–5) | <0.001 |
| Risser 0 | 1 | 2 | 3 | 4 | 5 | 0 | 1 | 1 | 2 | 11 | 1 | 0 | 0 | 0 | 0| 3 | 14 | |
| PHOS, median (range) | 4 (2–5) | 5 (4–5) | 0.007 |
| PHOS 1 | 2 | 3 | 4 | 5 | 0 | 1 | 1 | 8 | 3 | 0 | 0 | 0 | 1| 11 | |
| Instrumented major Cobb, degree, median (range) | |||
| Preoperative | 51 (36–69) | 49 (40–69) | 0.77 |
| First erect | 23.5 (4–36)a | 29 (13–46)a | 0.27 |
| 2-y follow-up | 15 (−16 to 38)a,b | 29 (12–42)a | 0.008 |
| Percent correction, % degree, median (range) | |||
| First erect | 55.5 (31–92) | 44 (33–73) | 0.37 |
| Total | 69 (28–132) | 53 (13–76) | 0.008 |
| Follow-up | 15 (−75 to 500) | 0 (−61 to 30) | 0.09 |
| Successful correction (residual curve degree <35), n (%) | |||
| First erect | 16 (100%) | 15 (79%) | 0.21 |
| Final follow-up | 15 (94%) | 15 (79%) | 0.58 |
| Noninstrumented thoracolumbar/lumbar curve, degree, median (range) | |||
| Preoperative | 32.5 (17–52) | 31.5 (9–47) | 0.77 |
| First erect | 13 (−6 to 29)a | 13 (3–33)a | 0.72 |
| 2-y follow-up | 13.5 (−17 to 27)a | 15 (0–31)a | 0.77 |
| Percent correction, % degree, median (range) | |||
| First erect | 42.5 (8–119) | 57.5 (−22 to 83) | 0.18 |
| Total | 51 (−14 to 153) | 55.5 (−33 to 100) | 0.85 |
| Follow-up | 4 (−183 to 214) | 0 (−300 to 100) | 0.64 |
| T5-T12 kyphosis, degree, median (range) | |||
| Preoperative | 23.5 (12–38) | 19 (4–38) | 0.51 |
| First erect | 21.5 (10–37) | 17 (4–35) | 0.10 |
| 2-y follow-up | 23.5 (15–41) | 20 (1–45) | 0.14 |
| Change in T5-T12 kyphosis, degree, median (range) | |||
| First erect | −5 (−12 to 9) | −5 (−13 to 16) | 0.82 |
| Total | 1.5 (−12 to 9) | 3 (−18 to 15) | 0.61 |
| Follow-up | 4 (−7 to 10) | 2.5 (−20 to 19) | 0.94 |