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X-ray of a profile view of the lumbar spine of a person suffering from a "slipped" or prolapsed intervertebral disc. Degeneration of any of the intervertebral discs in the backbone is termed spondylosis. This X-ray image includes the three lower lumbar vertebrae (termed L3, L4 & L5) and the sacrum (S1) at bottom. The intervertebral space between L4/L5 is greatly reduced and indicates that the intervening disc has degenerated and has been partly squeezed out of the space between the two backbones. Symptoms of pain & restriction of movement are treated by rest and wearing corsets. Severe cases may require surgical fusion.
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