Natural History of Postoperative Adding-On in Adolescent Idiopathic Scoliosis: What Are the Risk Factors for Progressive Adding-On?

Figure 4

(a) Preoperative radiograph of a 14-year-old boy with Lenke 1A curve. (b) 3-month postoperative radiograph shows adding-on with the disc angulation of 6.1°. Left shoulder elevated with RSH of 21.5 mm. (c) 2-year postoperative radiograph shows adding-on progressed with the disc angulation of 12.1°. Shoulders were level with RSH of 5.5 mm.

(a)

(b)

(c)