Lumbar foraminal stenosis is a condition where the hole the nerve exits from becomes narrowed and traps the nerve (pinched nerve). Since the hole changes in size with forward and backward bending, leg pain occurs when the patient stands and walks and reduces with sitting or bending forward. The anatomy of the lumbar spine and mechanics of this condition is discussed with this video: Lumbar Foraminal Stenosis-Pinched Nerve in the Lower Back.
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