The symptom associated with compression of a nerve root by a herniated lumbar disk is pain down the posterolateral aspect of the lower extremity. The straight leg-raising test (Lasègue’s sign) reproducing this pain is a key physical finding. In addition to pain, compression of the lumbosacral nerve roots can produce unilateral radiculopathy characterized by numbness, weakness, and/or loss of deep tendon reflexes. Lumbar intervertebral disks commonly herniate posterolaterally (Fig. 36-1). However, lumbar disks may herniate in the midline causing symptoms and signs in both lower extremities as well as bowel or bladder dysfunction (cauda equina syndrome).
KeywordsVertebral Body Nerve Root Pedicle Screw Spinal Canal Ligamentum Flavum
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