Figure 1

The histological grades of growth plates in adolescent idiopathic scoliosis. Grade 0 showing no signs of proliferative cartilage zone and growth activity(A). Grade I showing some proliferative cartilage zone but no growth activity(B). Grade II showing areas of growth inactivity and areas of proliferative cartilage zones(C). Grade III showing proliferative cartilage zones throughout the section(D).