It is when the inner: Material or nucleus pulposus moves through outer layer or annulus fibrosis which is thick & tough in most areas with the nucleus gel like at a younger age and dries out as we age to a consistency like crabmeat. As we age, the annulus develops cracks or tears which can expand & allow the nucleus out. The peak incidence for this is between ages30-50. Stepping on a jelly doughnut is an example.
Answered 12/9/2013
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