Yoga For Bulging Disc

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Sciatica is a medical condition characterized by pain going down the leg from the lower back. This pain may go down the back, outside, or front of the leg. Typically, symptoms are only on one side of the body. Certain causes, however, may result in pain on both sides. Lower back pain is sometimes but not always present. Weakness or numbness may occur in various parts of the affected leg and foot.

About 90% of the time sciatica is due to a spinal disc herniation pressing on one of the lumbar or sacral nerve roots. Other problems that may result in sciatica include spondylolisthesis, spinal stenosis, piriformis syndrome, pelvic tumors, and compression by a baby's head during pregnancy. The straight-leg-raising test is often helpful in diagnosis. The test is positive if, when the leg is raised while a person is lying on their back, pain shoots below the knee. In most cases medical imaging is not needed. Exceptions to this are when bowel or bladder function is affected, there is significant loss of feeling or weakness, symptoms are long standing, or there is a concern of a tumor or infection. Conditions that may present similarly are diseases of the hip and early herpes zoster before the rash appears.

Treatment initially is typically with pain medications. It is generally recommended that people continue with activities to the best of their abilities. Often all that is required is time: in about 90% of people the problem goes away in less than six weeks. If the pain is severe and lasts for more than six weeks then surgery may be an option. While surgery often speeds pain improvement, long term benefits are unclear. Surgery may be required if complications occur such as bowel or bladder problems. Many treatments, including steroids, gabapentin, acupuncture, heat or ice, and spinal manipulation, have poor evidence for their use.

Depending on how it is defined, 2% to 40% of people have sciatica at some point in time. It is most common during people's 40s and 50s, and men are more frequently affected than women. The condition has been known since ancient times. The first known use of the word sciatica dates from 1451.


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Definition

The term "sciatica" describes a symptom-- pain along the sciatic nerve pathway-- rather than a specific condition, illness, or disease. Some use it to mean any pain starting in the lower back and going down the leg. Others use the term more specifically to mean a nerve dysfunction caused by compression of one or more lumbar or sacral nerve roots from a spinal disc herniation. though in this second use it is a diagnosis (i.e., it indicates a cause and effect). Pain typically occurs in the distribution of a dermatome and goes below the knee to the foot. It may be associated with neurological dysfunction, such as weakness. The pain is characteristically of a shooting type, quickly traveling along the course of the nerve.


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Causes

Spinal disc herniation

Spinal disc herniation pressing on one of the lumbar or sacral nerve roots is the most frequent cause of sciatica, being present in about 90% of cases.

Sciatica caused by pressure from a disc herniation and swelling of surrounding tissue can spontaneously subside if the tear in the disc heals and the pulposus extrusion and inflammation cease.

Spinal stenosis

Other compressive spinal causes include lumbar spinal stenosis, a condition in which the spinal canal (the spaces the spinal cord runs through) narrows and compresses the spinal cord, cauda equina, or sciatic nerve roots. This narrowing can be caused by bone spurs, spondylolisthesis, inflammation, or a herniated disc, which decreases available space for the spinal cord, thus pinching and irritating nerves from the spinal cord that travel to the sciatic nerves.

Piriformis syndrome

Piriformis syndrome is a controversial condition that, depending on the analysis, varies from a "very rare" cause to contributing to up to 8% of low back or buttock pain. In 17% of the population, the sciatic nerve runs through the piriformis muscle rather than beneath it. When the muscle shortens or spasms due to trauma or overuse, it is posited that this causes compression of the sciatic nerve. It has colloquially been referred to as "wallet sciatica" since a wallet carried in a rear hip pocket compresses the buttock muscles and sciatic nerve when the bearer sits down. Piriformis syndrome causes sciatica when the nerve root itself remains normal and no herniation of a spinal disc is apparent.

Pregnancy

Sciatica may also occur during pregnancy as a result of the weight of the fetus pressing on the sciatic nerve during sitting or during leg spasms. While most cases do not directly harm the fetus or the mother, indirect harm may come from the numbing effect on the legs, which can cause loss of balance and falls. There is no standard treatment for pregnancy-induced sciatica.

Other

Sciatica can also be caused by tumors impinging on the spinal cord or the nerve roots. 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. Trauma to the spine, such as from a car accident, may also lead to sciatica.


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Pathophysiology

Sciatica is generally caused by the compression of lumbar nerves L4, or L5 or sacral nerves S1, S2, or S3, or by compression of the sciatic nerve itself. When sciatica is caused by compression of a dorsal nerve root (radix), it is considered a lumbar radiculopathy (or radiculitis when accompanied with an inflammatory response). This can occur as a result of a spinal disk bulge or spinal disc herniation (a herniated intervertebral disc), or from roughening, enlarging, or misalignment (spondylolisthesis) of the vertebrae, or as a result of degenerated discs that can reduce the diameter of the lateral foramen (natural hole) through which nerve roots exit the spine. The intervertebral discs consist of an annulus fibrosus, which forms a ring surrounding the inner nucleus pulposus. When there is a tear in the anulus fibrosus, the nucleus pulposus (pulp) may extrude through the tear and press against spinal nerves within the spinal cord, cauda equina, or exiting nerve roots, causing inflammation, numbness, or excruciating pain. Inflammation of the spinal canal can also spread to adjacent facet joints and cause lower back pain and/or referred pain in the posterior thigh(s). Pseudosciatic pain can also be caused by compression of peripheral sections of the nerve, usually from soft tissue tension in the piriformis or related muscles.

The spinal discs are composed of a tough spongiform ring of cartilage ("anulus fibrosus") with a more malleable center ("nucleus pulposus"). The discs separate the vertebrae, thereby allowing room for the nerve roots to properly exit through the spaces between the vertebrae. The discs cushion the spine from compressive forces, but are weak to pressure applied during rotational movements. That is why a person who bends to one side, at a bad angle to pick something up, may more likely herniate a spinal disc than a person jumping from a ladder and landing on their feet.

Herniation of a disc occurs when the liquid center of the disc bulges outwards, tearing the external ring of fibers, extrudes into the spinal canal, and compresses a nerve root against the lamina or pedicle of a vertebra, thus causing sciatica. This extruded liquid from the "nucleus pulposus" may cause inflammation and swelling of surrounding tissue, which may cause further compression of the nerve root in the confined space in the spinal canal. Many herniated discs themselves, however, cause no pain or discomfort: only occasionally does a disc herniation cause sciatica.


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Diagnosis

Sciatica is typically diagnosed by physical examination, and the history of the symptoms. Generally if a person reports the typical radiating pain in one leg as well as one or more neurological indications of nerve root tension or neurological deficit, sciatica can be diagnosed.

The most applied diagnostic test is the straight leg raise to produce Lasègue's sign, which is considered positive if pain in the distribution of the sciatic nerve is reproduced with passive flexion of the straight leg between 30 and 70 degrees. While this test is positive in about 90% of people with sciatica, approximately 75% of people with a positive test do not have sciatica.

Imaging tests such as computerised tomography or magnetic resonance imaging can help with the diagnosis of lumbar disc herniation. The utility of MR neurography in the diagnoses of piriformis syndrome is controversial.


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Management

When the cause of sciatica is lumbar disc herniation, most cases resolve spontaneously over weeks to months. Initially treatment in the first 6-8 weeks should be conservative. There does not appear to be a significant difference in outcomes between advice to stay active and recommendations of bed rest. Similarly, physical therapy (directed exercise) has not been found better than bed rest.

Medication

Medicines are commonly prescribed for the treatment of sciatica, but evidence for pain medication is poor. Specifically, low-quality evidence indicates that NSAIDs do not appear to improve immediate pain and all NSAIDs appear about equivalent. Evidence is also lacking in use of opioids and muscle relaxants by usual means. In those with sciatica due to piriformis syndrome, botulinum toxin injections may improve pain and or function. There is little evidence for steroids, either epidural or by pill. Low-quality evidence supports the use of gabapentin for acute pain relief in those with chronic sciatica.

Surgery

Surgery for unilateral sciatica involves the removal of part of the disc, which is known as a discectomy. While it results in short-term benefits, the long-term benefits appear to be equivalent to conservative care. Treatment of the underlying cause of the compression is needed in cases of epidural abscess, epidural tumors, and cauda equina syndrome.

Alternative medicine

Low to moderate-quality evidence suggests that spinal manipulation is an effective treatment for acute sciatica. For chronic sciatica, the evidence is poor. Spinal manipulation has been found generally safe for the treatment of disc-related pain; however, case reports have found an association with cauda equina syndrome and it is contraindicated when there are progressive neurological deficits.


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Epidemiology

Depending on how it is defined, 2% to 40% of people have sciatica at some point in time. It is most common during people's 40s and 50s and men are more frequently affected than women.

Source of the article : Wikipedia



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