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A intervertebral disc disorder is a condition that involves deterioration, herniation, or other dysfunction of an intervertebral disc. As people age, the ''nucleus pulposus'' begins to dehydrate, which limits its ability to transfer and distribute loads between the vertebrae. These loads are instead transferred non-uniformly through the ''anulus fibrosus'', which undergoes progressive, structural deterioration. While this may not cause pain in some people, in others one or both of these may cause chronic pain. Pain due to the inability of the dehydrating ''nucleus pulposus'' to absorb shock is called axial pain or disc space pain. One generally refers to the gradual dehydration of the ''nucleus pulposus'' as degenerative disc disease. When the ''anulus fibrosus'' tears due to an injury or the aging process, the ''nucleus pulposus'' can begin to extrude through the tear. This is called disc herniation. Near the posterior side of each disc, all along the spine, major spinal nerves extend out to different organs, tissues, extremities etc. It is very common for the herniated disc to press against these nerves (pinched nerve) causing radiating pain, numbness, tingling, and diminished strength and/or range of motion. In addition, the contact of the inner nuclear gel with a nerve can also cause significant pain. Nerve-related pain is called radicular pain. Herniated discs go by many names and these can mean different things to different medical professionals. A slipped disc, ruptured disc, or a bulging disc can all refer to the same medical condition. Protrusions of the disc into the adjacent vertebra are known as Schmorl's nodes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intervertebral disc disorder」の詳細全文を読む スポンサード リンク
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