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Spinal disc protrusion visible in MRI [1] A disc protrusion is a medical condition that can occur in some vertebrates, including humans, in which the outermost layers of the anulus fibrosus of the intervertebral discs of the spine are intact but bulge when one or more of the discs are under pressure.
The Transportation Research Center (TRC) is North America's largest multi-user automotive proving ground. It is operated by TRC Inc. The center occupies 4,500 acres in East Liberty, Ohio, about 40 miles northwest of Columbus, Ohio.
Disc herniation is normally a further development of a previously existing disc protrusion, in which the outermost layers of the annulus fibrosus are still intact, but can bulge when the disc is under pressure. In contrast to a herniation, none of the central portion escapes beyond the outer layers.
Schmorl's nodes are fairly common, especially with minor degeneration of the aging spine, but they are also seen in younger spines. Schmorl's nodes often cause no symptoms, but may simply reflect that "wear and tear" of the spine has occurred over time; they may also reflect that bone strength was at one time somewhat compromised, perhaps due to a vitamin D deficiency although this has yet to ...
Optical digital recorder - Algorithms and coatings that led to the first optical digital recorder developed by James Russell, which paved the way for the first compact disc, and the first generation jet engines using titanium alloys. [9] Armor plating for tanks in World War II. Correction fluid - Snopake, the first correction fluid, developed ...
This classification describes how far away from mid-line a disc protrusion is using a grade of A, B, or C. [7] Grade A describes a herniation at midline. Grade C herniations are the most lateral and protrude into the intervertebral foramen (through which spinal nerves travel).
The femoral nerve stretch test can identify spinal nerve root compression, which is associated with disc protrusion and femoral nerve injury.It can reliably identify spinal nerve root compression for L2, L3, and L4. [2]
CT scan image of large herniated disc in the lumbar spine. Removal of a disc at one level can lead to disc herniation at a different level at a later time. Even the most complete surgical excision of the disc still leaves 30–40% of the disc, which cannot be safely removed. This retained disc can re-herniate sometime after surgery.
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