Backache is one of those common symptoms from which nearly all of us suffer at some time.

For the majority, it proves to be a minor problem like an occasional headache. For others, it may lead to severe and prolonged pain and disability and result in permanent invalidity.

It may be associated with secondary emotional illness with depression, lack of self-esteem, chronic anxiety and domestic and marital problems. The old idea of many chronic back sufferers being malingerers has, one hopes, almost disappeared.

The spinal column consists of a number of bones, the vertebrae. When looked at from the front, it is straight, but when viewed from the side, it has a number of curves. Because they are arranged like two Ss, one on top of the other, the end result is a functional straight line.

Each vertebra consists of a thick portion of bone, the body, from which two projections come off and meet at the back forming a canal through which the spinal cord passes.

A further projection, the spine, comes off where these join and this is the knob we feel in the centre of our backs. Further projections both upwards and downwards form joints with the vertebra above and below.

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