Impingement pain tends to be sharp, well localized, and can be associated with paresthesia, whereas irritation pain tends to be dull, poorly localized, and without paresthesia. Impingement is associated with a positive straight-leg raising sign, whereas irritation is not. Neurologic deficits and pain radiation below the knee are rarely seen in irritation alone and are most commonly found with impingement.
The cause of impingement syndrome is most commonly herniated discs, but it may also be caused by spinal stenosis, spinal degeneration, or cauda equina syndrome.
For more on the causes of back pain, read here.
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Cite this: James W. Pritchett. Fast Five Quiz: How Much Do You Know About Mechanical Low Back Pain? - Medscape - Dec 15, 2017.