TABLE 3.
Radiographic and Surface Measurements
| Preop | FE | 1 year | FU | |
| Coronal plane | ||||
| Tethered curve Cobb | 50.8° ± 10.2 (31 to 81) | 26.6° ± 10.1 (−3 to 61) ψ | 23.1° ± 12.4 (−37 to 57) Φ | 25.7° ± 16.3 (−32 to 58)λΣ |
| Tethered curve correction (%) | 47.7 ± 16.2 (7 to 107) | 55.1 ± 22.7 (5 to 184) Φ | 49.6 ± 30.5 (−16 to 159) λ | |
| Instrumented Cobb | 22.7° ± 10.6 (−1 to 57) | 15.1° ± 12.6 (−18 to 55) Φ | 19.0° ± 15.8 (−29 to 57) λ | |
| Untethered minor curve Cobb | 31.0° ± 9.5 (3 to 57) | 20.3° ± 10.3 (0 to 52) ψ | 18.1° ± 10.8 (−22 to 50) Φ | 18.4° ± 14.2∗ (−13 to 62) Σ |
| Untethered minor curve correction (%) | 34.3 ± 33.8 | 43.5 ± 31.3 Φ | 41.6 ± 60.9 | |
| Sagittal plane | ||||
| Thoracic kyphosis T5–T12 | 18.6° ± 11.4 (−8 to 47) | 18.8° ± 11.8 (−12 to 45) | 18.6° ± 12.3 (−14 to 55) | 21.4° ± 13.0 (−14 to 66)λΣ |
| Lumbosacral lordosis L1–S1 | −55.9° ± 10.5 (−99 to −28) | −54.0° ± 10.9 (−88 to −30) ψ | −55.7° ± 10.9 (−87 to −24)Φ | −56.2° ± 11.4 (−83 to −24) |
| Thoracic tether instrumented sagittal Cobb | 16.6° ± 12.2 (−12 to 50) | 16.7° ± 13.0 (−13 to 54) | 17.1° ± 13.1 (−12 to 51) | |
| Lumbar tether instrumented sagittal Cobb | −10.5° ± 12.9 (−35 to 5) | −10.8° ± 11.5 (−24 to 6) | −8.8° ± 10.2 (−20 to 9) | |
| Surface measurements | ||||
| Rib hump | 14.1° ± 4.8 (0 to 26) | 8.1° ± 4.3 (0 to 22) ψ | 8.6° ± 4.7 (0 to 25) | 8.8° ± 5.4 (0 to 22) Σ |
| Lumbar prominence | 3.6° ± 4.7 (0 to 17) | 2.2° ± 3.6 (0 to 16) ψ | 2.4° ± 3.6 (0 to 15) | 2.5° ± 4.4 (0 to 18) Σ |
Changes from preop to FE: ψ denotes significance; tethered curve Cobb/tethered curve correction/untethered minor curve Cobb/rib hump all P < 0.001, lumbosacral lordosis P = 0.03 (non-significant: thoracic kyphosis P = 0.58, lumbar prominence P = 0.052).
Change from FE to 1 year: Φ denotes significance; tethered curve Cobb/ tether curve correction/ instrumented Cobb/untethered minor curve Cobb/untethered minor curve correction all P < .001, lumbosacral lordosis P = 0.04 (non-significant: thoracic kyphosis P = 0.50, thoracic tether instrumented sagittal Cobb P = 0.80, lumbar tether instrumented sagittal Cobb P = 0.67, rib hump P = 0.40, lumbar prominence P = 0.91).
Change 1 year to FU: λ denotes significance; tethered curve Cobb/tethered curve correction/instrumented Cobb all <0.001, thoracic kyphosis P = 0.002 (non-significant; untethered minor curve Cobb P = 0.37, untethered minor curve correction P = 0.60, thoracic kyphosis P = 0.26, lumbosacral lordosis P = 0.45, thoracic tether instrumented sagittal Cobb P = 0.80, lumbar tether instrumented sagittal Cobb P = 0.14, rib hump P = 0.55, lumbar prominence P = 0.52).
Change preop to FU: Σ denotes significance; tethered curve Cobb/untethered minor curve Cobb/ rib hump 0.000 all P < 0.001, thoracic kyphosis P = 0.004, lumbar prominence P = 0.03 (non-significant; lumbosacral lordosis P = 0.86).
One cases underwent delayed lumbar curve tethering between 1 year and MRF, thus excluded and n = 107 for this time point.