In the low back, nerves join to form the sciatic nerve, which runs down into the leg and controls the leg muscles. Sciatica is the descriptive term for when pain runs from your back or buttocks down your leg and even into your foot. It is a condition caused by either compression or trauma of the sciatic nerve. Sciatica is made worse when you cough or if someone lifts your leg up while you are lying down. Symptoms may begin abruptly or gradually, are usually irritated by movement, and often grow worse at night. Sciatica implies that there is an irritation of your nerve root in the lower part of your spine. In some instances, this could be due to a ruptured or herniated disc in your lower back.
Written by Michael J. Musacchio, Jr., M.D. (Posted on March 30, 2011)
Sciatica is simply defined as pain in the distribution of the sciatic nerve, and it is one of the most common conditions seen by a spine specialist. I frequently see patients at the Center for Spine Care who have sciatica.
The sciatic nerve is actually a bundle of nerves that originate from the lower nerve roots of the spine (L4 to S3). Its main functions include supplying motor function to the muscles of the leg and transmitting sensory information from the leg to the spinal cord.
The most common cause of sciatica is radiculopathy caused by impingement of a nerve root by a herniated disc or bone spur in the spine. Other common causes include arthritis in the spine, stenosis or narrowing of the spinal canal, muscular strain or spasm, and generalized inflammation of the spine or its supporting structures.
Fortunately, sciatica is typically short lived, lasting only 6 to 8 weeks in the majority of patients, and usually responds readily to conservative care. Typically, a course of physical therapy and anti-inflammatory medications is recommended as first line treatment. Steroid injections can help the symptoms resolve more quickly by reducing inflammation of the nerve and can also help confirm the cause of the sciatica. A small percentage of patients will fail to improve and, when a specific nerve impingement is confirmed by MRI or CT scan, minimally invasive surgical options may be appropriate. Typically this involves minimally invasive discectomy or minimally invasive decompression of stenosis.
Michael Musacchio, Jr., M.D., a Center for Spine Care neurosurgeon specializing in minimally invasive spine surgery.
More Frequently Asked Questions:
What is degenerative disk disease?
What is a bulging/ruptured/herniated disk?
What is radiculopathy/nerve impingement?
What is spinal stenosis?
What is the difference between x-rays, MRI, and CT scan?
What is an EMG or NCS?
What is physical therapy?
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