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  2. Spondylolisthesis - Wikipedia

    en.wikipedia.org/wiki/Spondylolisthesis

    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 ...

  3. Retrolisthesis - Wikipedia

    en.wikipedia.org/wiki/Retrolisthesis

    Retrolisthesis can be classified as a form of spondylolisthesis, since spondylolisthesis is often defined in the literature as displacement in any direction. [1] [2] Yet, medical dictionaries usually define spondylolisthesis specifically as the forward or anterior displacement of a vertebra over the vertebra inferior to it (or the sacrum).

  4. Spondylolysis - Wikipedia

    en.wikipedia.org/wiki/Spondylolysis

    Most patients with spondylolysis do not require surgery but, if the symptoms are not relieved with non-surgical treatments, or when the condition progresses to high grade spondylolisthesis, then patients may require surgery. [23] Spinal fusion: This procedure is recommended when a set of vertebrae becomes loose or unstable. The surgeon joins ...

  5. Spondylosis - Wikipedia

    en.wikipedia.org/wiki/Spondylosis

    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.

  6. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    Fourth grade (also 4th Grade or Grade 4) is the fourth year of formal or compulsory education. It is the fourth year of primary school . Children in fourth grade are usually 9–10 years old.

  7. Educational stage - Wikipedia

    en.wikipedia.org/wiki/Educational_stage

    The high school itself is broken into 2 parts: A and B. [further explanation needed] Preschool educations are informal, therefore Grade 1 is the first year. In Grade 1 (پایه‌ÛŒ 1, Paye 1 ) also known as the 1st class (کلاس اوّل, Klãs Avval ), children learn the basics of reading and writing.

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