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Intradural disc herniation occurs when the disc material crosses the dura mater and enters the thecal sac. It is a rare form of disc herniation with an incidence of 0.2–2.2%. Pre-operative imaging can be helpful for diagnosis, but intra-operative findings are required for confirmation. [26]
Lumbar disc disease is the drying out of the spongy interior matrix of an intervertebral disc in the spine. Many physicians and patients use the term lumbar disc disease to encompass several different causes of back pain or sciatica. In this article, the term is used to describe a lumbar herniated disc.
[59] [60] Many observers have noted that the most common cause of a failed back syndrome (FBS) is caused from recurrent disc herniation at the same level originally operated. A rapid removal in a second surgery can be curative. The clinical picture of a recurrent disc herniation usually involves a significant pain-free interval.
The straight leg raise test is almost always positive in those with disc herniation, [5] and lumbar provocative discography may be useful to identify a specific disc causing pain in those with chronic high levels of low back pain. [47] Therapeutic procedures such as nerve blocks can also be used to determine a specific source of pain. [5]
These findings emphasize the importance of using precise terms in describing the imaging abnormalities and evaluating them strictly in the context of the patient's symptoms. [1] A disc protrusion may progress to a spinal disc herniation, a condition in which there is a tear in the anulus fibrosus. [2]
The part of the spinal cord that was damaged corresponds to the spinal nerves at that level and below. Injuries can be cervical 1–8 (C1–C8), thoracic 1–12 (T1–T12), lumbar 1–5 (L1–L5), [9] or sacral (S1–S5). [10] A person's level of injury is defined as the lowest level of full sensation and function. [11]
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Degenerative disc disease (DDD) is a medical condition typically brought on by the aging process in which there are anatomic changes and possibly a loss of function of one or more intervertebral discs of the spine. [1] DDD can take place with or without symptoms, but is typically identified once symptoms arise.