Scoliosis is a curvature of the spine. This occurs in three dimensions. The spine appears curved when an affected child is viewed from the back, from the side and from the top (because the spine twists as it curves sideways).
Some children are born with scoliosis. This type is referred to as congenital. It is caused by an abnormal formation of one or more vertebrae, which are the building blocks of the spine. Some children develop scoliosis as they get older. This type is referred to as idiopathic, because it does not have a known cause. Idiopathic scoliosis is the most common form. It tends to run in families, but no gene or other specific risk factor has been identified. Some children develop scoliosis as a result of nerve disease or injury, such as paralysis.
There are several common misconceptions about scoliosis. Below are some true statements regarding scoliosis:
- Backpacks and other heavy objects will not produce scoliosis.
- Scoliosis is not an occupational hazard.
- Exercises, stretching and other physical activities are good for general health, but have never been shown to affect magnitude or progression of scoliosis.
- Similarly, while good diet is essential to good living, there is no evidence that diet can cause or cure or in any other way significantly influence scoliosis.
Two principal mechanisms underlie scoliosis. First, if there is abnormal development of the vertebrae (for example, one may be wedge-shaped instead of rectangular), then the spine will grow crooked because the bones which make it up grow crooked. Second, if there is an imbalance of the nerve signals to the muscles which support and move the spine, then they will pull against the spine in an asymmetric manner and make it grow crooked.
As spinal curvature increases, posture worsens, and this can result in significant social disability. In addition, abnormal posture may interfere with activities of daily living and with work. In theory, once spinal curvature exceeds 90 degrees, lung and heart function can become compromised as the chest cavity becomes distorted and there is less room for the internal organs.
The principal non-surgical option is bracing. The most widely used brace for scoliosis is known as a thoracolumbosacral orthosis, or TLSO, of the Boston type, after the location where it was designed. This is made of rigid plastic. It has a front half and a back half, which are tightened together by straps. On the inside, there are several foam pads which push against the ribs and flanks to hold the spine in areas determined by the type of curvature and the x-ray image. The brace is worn full-time, which is defined as more than 20 hours every day. This includes sleeping, eating and going to school. The decision to brace needs to be well thought out and carefully discussed by the child, the family and the orthopaedic surgeon.
Once curvature of the spine exceeds 50 degrees, surgery is recommended. The primary purpose of surgery is spinal fusion, which makes the vertebrae stick together so that they no longer can curve. The vertebrae may be likened to beads on a string: if they are transformed into a single, long bead (or bone mass), the spine can not curve. Despite these considerations, children with scoliosis are able to enjoy a normal life and to participate fully in all activities, including sports.
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