Figure 7.

Preoperative posteroanterior scoliosis radiograph of an immature group patient (Risser 2, proximal humerus ossification system 1 [PHOS 1]) with a 50° thoracic curve and 32° thoracolumbar curve. First erect (FE) radiograph shows correction of major and compensatory curves. FE% correction was 92%. The patient was Risser 4 (PHOS 5) at 24 mo, and posteroanterior radiograph shows major curve overcorrection (2-y percent correction [YR2%] = 132%), corresponding to a 500% follow-up percent change (from FE to YR2). Apical wedge angle was 8° at FE and 0° at YR2, generating a vertebral body squaring of 8°. Follow-up angles were measured between vertebra contained by the black bars, where white bars indicate preoperative angles. Yellow arrow indicates the apical vertebra, and yellow dots mark the vertebral body margins.