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Epidural steroid injection (ESI) is a technique in which corticosteroids and a local anesthetic are injected into the epidural space around the spinal cord in an effort to improve spinal stenosis, spinal disc herniation, or both. It is of benefit with a rare rate of major side effects.
The injection of steroids into the epidural space is sometimes used to treat nerve root pain, radicular pain and inflammation caused by conditions such as spinal disc herniation, degenerative disc disease, and spinal stenosis. [16] The risk of complications from steroid administration is low and complications are usually minor.
Spinal stenosis is an abnormal narrowing of the spinal canal or neural foramen that results in pressure on the spinal cord or nerve roots. [6] Symptoms may include pain, numbness, or weakness in the arms or legs. [1]
The nerve roots from L4–S4 join in the sacral plexus which affects the sciatic nerve, which travels caudally (toward the feet). Compression, trauma or other damage to this region of the spinal canal can result in cauda equina syndrome. [citation needed] The symptoms may also appear as a temporary side-effect of a sacral extra-dural injection. [9]
Nerve block or regional nerve blockade is any deliberate interruption of signals traveling along a nerve, often for the purpose of pain relief. Local anesthetic nerve block (sometimes referred to as simply "nerve block") is a short-term block, usually lasting hours or days, involving the injection of an anesthetic, a corticosteroid, and other agents onto or near a nerve.
The former is the most common, causing low back pain (lumbago) and often leg pain as well, in which case it is commonly referred to as sciatica. Lumbar disc herniation occurs 15 times more often than cervical (neck) disc herniation, and it is one of the most common causes of low back pain.
Epidural administration: injection into the epidural space of the spinal cord.Epidural, (Greek): situated on or outside the dura mater, from epi- "on top of" + dura mater + -al. Adhesion (Latin) adhēsiōn- for Latin adhaesiōn- (stem of adhaesiō) a clinging, equivalent to adhaes(us), past participle of adhaerēre to adhere + -iōn- -ion.
Sciatica can be caused by tumors impinging on the spinal cord or the nerve roots. [4] Severe back pain extending to the hips and feet, loss of bladder or bowel control, or muscle weakness may result from spinal tumors or cauda equina syndrome. [15]
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