The Full Form of PIVD is Prolapsed Intervertebral Disc.
A prolapsed (herniated) disc occurs when the outer fibres of the intervertebral disc are injured, and the soft material known as the nucleus pulposus, ruptures out of its enclosed space.
The prolapsed disc or ruptured disc material can enter the spinal canal, squashing the spinal cord, but more frequently the spinal nerves.
Herniated discs rarely occur in children, and are most common in young and middle-aged adults. A herniation may develop suddenly, or gradually over weeks or months.
PIVD
means
Prolapsed Intervertebral Disc
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