Scoliosis is an abnormal curvature of the spine. There are several types of scoliosis: idiopathic, congenital, neuromuscular, and degenerative. Scoliosis most commonly affects the thoracic and thoraco-lumbar spine. Residual curves may be present in the lumbar spine. This curve may and can affect the lower lumbar spine at the area where it articulates with the sacrum thus affecting the sacroiliac joints.