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Spondylolysis is a defect or stress fracture in the pars interarticularis of the vertebral arch. [1] The vast majority of cases occur in the lower lumbar vertebrae (L5), but spondylolysis may also occur in the cervical vertebrae .
Spondylosis is the degeneration of the vertebral column from any cause. In the more narrow sense, it refers to spinal osteoarthritis , the age-related degeneration of the spinal column, which is the most common cause of spondylosis.
In other words, in the axial view, it is the bony mass between the facets that is anterior to the lamina and posterior to the pedicle. It is abnormal in spondylolysis, either due to fracture or congenitally. [1] Bilateral C2 pars fractures are known as a variant of the hangman's fracture.
Spondylolisthesis is when one spinal vertebra slips out of place compared to another. [1] While some medical dictionaries define spondylolisthesis specifically as the forward or anterior displacement of a vertebra over the vertebra inferior to it (or the sacrum), [2] [3] it is often defined in medical textbooks as displacement in any direction.
Microscopically visible ileal inflammation is seen in about 50% of people with spondyloarthritis and ankylosing spondylitis during ileocolonoscopy. [11] [4] There seems to be an immunological connection between the gut inflammation observed in Crohn's disease and ankylosing spondylitis. [12]
Diffuse idiopathic skeletal hyperostosis (DISH) is a condition characterized by abnormal calcification/bone formation (hyperostosis) of the soft tissues surrounding the joints of the spine, and also of the peripheral or appendicular skeleton. [1]
The proof of an ongoing pathologic process in a Modic change has been documented by SPECT analysis [Isotope scanning using single positron emission computerized tomography], combined with high-resolution CT imaging. This method has shown high metabolic activity in 96.1% of endplates with Modic change type I and 56% with Modic change type 2. [50]
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