The spine has a natural front-to-back curve. But about 2% of children and adolescents worldwide have an abnormal sideways S- or C-shaped curve of the spine, known as scoliosis. How can you tell if your child is one? To help you find out, have them bend forward, knees straight, arms hanging loosely, as if trying to touch their toes. If one side of the rib cage is more prominent than the other, ie forms a hump or an arch, it could indicate scoliosis, says orthopaedist Dr Jens Seifert, head physician of the Spine Centre at the Asklepios Hohwald Specialist Clinic in Germany. The condition is typic…