Scoliosis Research Society (SRS)
An International Organization Dedicated to the Education, Research and Treatment of Spinal Deformity
Our Mission is to Foster Optimal Care for All Patients with Spinal Deformities
All spines have kyphosis (forward bend), but it is typically limited to the thoracic spine. The body balances the thoracic kyphosis with lordosis (backward bend) in the cervical and lumbar spines. The body usually has approximately equal degrees of lumbar lordosis and thoracic kyphosis, although this can vary with age, degrees of arthritis, and various disease processes. The body’s normal weight-bearing line extends from the skull (C1) through the first vertebra of each section of the spine (T1, L1, S1). Physicians call this line the “C7 plumb line”. If there is a loss of lumbar lordosis and/or increase in thoracic kyphosis, this weight-bearing line can move in front of the spine and hips.