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

Figure 2

(a) A 14-year-old girl with Lenke 1A curve. T12 was SSV; Risser grade was 3. (b) First erect radiograph postoperatively with fusion to T12. (c) 3-month postoperative radiograph shows adding-on; the angulation of the first disc below the instrumentation was 10.6°. (d) 2.4-year postoperative radiograph shows adding-on decreased; the disc angulation decreased to 2.8°.

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