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| Image = Spinal column curvature 2011.png | Caption = Different regions (curvatures) of the vertebral column | DiseasesDB = 15544 | ICD10 = M54 | ICD9 = 724.5 | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = | eMedicineTopic = | MeshID = D001416 }}

Back pain (also known as dorsalgia) is pain felt in the back that usually originates from the muscles, nerves, bones, joints or other structures in the spine.

Back pain may have a sudden onset or can be a chronic pain; it can be constant or intermittent, stay in one place or radiate to other areas. It may be a dull ache, or a sharp or piercing or burning sensation. The pain may radiate into the arm and hand), in the upper back, or in the low back, (and might radiate into the leg or foot), and may include symptoms other than pain, such as weakness, numbness or tingling.

Back Pain is one of humanity's most frequent complaints. In the U.S., acute low back pain (also called lumbago) is the fifth most common reason for physician visits. About nine out of ten adults experience back pain at some point in their life, and five out of ten working adults have back pain every year.[1]

The spine is a complex interconnecting network of nerves, joints, muscles, tendons and ligaments, and all are capable of producing pain. Large nerves that originate in the spine and go to the legs and arms can make pain radiate to the extremities.

Classification

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Back pain can be divided anatomically: neck pain, upper back pain, lower back pain or tailbone pain.

By its duration: acute (less than 4 weeks), subacute (4 – 12 weeks), chronic (greater than 12 weeks).

By its cause: musculoskeletal (MSK), infectious, cancer, etc.

Back pain is classified according to etiology in mechanical (also called musculoskeletal or nonspecific back pain) and secondary back pain. Approximately 98% of back pain patients are diagnosed with nonspecific (mechanical) acute back pain, which has no serious underlying pathology[2] and related to various musculoskeletal problems such as vertebrae misalignment, nerve interference (also called subluxation),[3] muscle tension, muscle spasm,[4][5] strained muscles [6] sprained ligaments,[6] ruptured disks[6] (also called "slipped"[7] or herniated disks),[8] degenerative disks,[8] and irritated joints.[6] However, secondary back pain which is caused by an underlying condition accounts for nearly 2% of the cases. Underlying pathology in these cases may include metastatic cancer, spinal osteomyelitis and epidural abscess which account for 1% of the patients. Also, herniated disc is the most common neurologic impairment which is associated with this condition, from which 95% of disc herniations occur at the lowest two lumbar intervertebral levels.[2]

Associated conditions

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Back pain can be a sign of a serious medical problem, although this is not most frequently the underlying cause:

  • Typical warning signs of a potentially life-threatening problem are bowel and/or bladder incontinence or progressive weakness in the legs.
  • Severe back pain (such as pain that is bad enough to interrupt sleep) that occurs with other signs of severe illness (e.g. fever, unexplained weight loss) may also indicate a serious underlying medical condition.
  • Back pain that occurs after a trauma, such as a car accident or fall, may indicate a bone fracture or other injury.
  • Back pain in individuals with medical conditions that put them at high risk for a spinal fracture, such as osteoporosis or multiple myeloma, also warrants prompt medical attention.
  • Back pain in individuals with a history of cancer (especially cancers known to spread to the spine like breast, lung and prostate cancer) should be evaluated to rule out metastatic disease of the spine.

Back pain does not usually require immediate medical intervention. The vast majority of episodes of back pain are self-limiting and non-progressive. Most back pain syndromes are due to inflammation, especially in the acute phase, which typically lasts for two weeks to three months.

A few observational studies suggest that two conditions to which back pain is often attributed, lumbar disc herniation and degenerative disc disease may not be more prevalent among those in pain than among the general population, and that the mechanisms by which these conditions might cause pain are not known.[9][10][11][12] Other studies suggest that for as many as 85% of cases, no physiological cause can be shown.[13][14]

A few studies suggest that psychosocial factors such as on-the-job stress and dysfunctional family relationships may correlate more closely with back pain than structural abnormalities revealed in x-rays and other medical imaging scans.[15][16][17][18]

Differential diagnosis

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There are several potential sources and causes of back pain.[19] However, the diagnosis of specific tissues of the spine as the cause of pain presents problems. This is because symptoms arising from different spinal tissues can feel very similar and is difficult to differentiate without the use of invasive diagnostic intervention procedures, such as local anesthetic blocks.

One potential source of back pain is skeletal muscle of the back. Potential causes of pain in muscle tissue include muscle strains (pulled muscles), muscle spasm, and muscle imbalances. However, imaging studies do not support the notion of muscle tissue damage in many back pain cases, and the neurophysiology of muscle spasm and muscle imbalances is not well understood.

Another potential source of low back pain is the synovial joints of the spine (e.g. zygapophysial joints/facet joints. These have been identified as the primary source of the pain in approximately one third of people with chronic low back pain, and in most people with neck pain following whiplash.[19] However, the cause of zygapophysial joint pain is not fully understood. Capsule tissue damage has been proposed in people with neck pain following whiplash. In people with spinal pain stemming from zygapophysial joints, one theory is that intra-articular tissue such as invaginations of their synovial membranes and fibro-adipose meniscoids (that usually act as a cushion to help the bones move over each other smoothly) may become displaced, pinched or trapped, and consequently give rise to nociception (pain).

There are several common other potential sources and causes of back pain: these include spinal disc herniation and degenerative disc disease or isthmic spondylolisthesis, osteoarthritis (degenerative joint disease) and lumbar spinal stenosis, trauma, cancer, infection, fractures, and inflammatory disease.[20]

Radicular pain (sciatica) is distinguished from 'non-specific' back pain, and may be diagnosed without invasive diagnostic tests.

New attention has been focused on non-discogenic back pain, where patients have normal or near-normal MRI and CT scans. One of the newer investigations looks into the role of the dorsal ramus in patients that have no radiographic abnormalities. See Posterior Rami Syndrome.

Management

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The management goals when treating back pain are to achieve maximal reduction in pain intensity as rapidly as possible; to restore the individual's ability to function in everyday activities; to help the patient cope with residual pain; to assess for side-effects of therapy; and to facilitate the patient's passage through the legal and socioeconomic impediments to recovery. For many, the goal is to keep the pain to a manageable level to progress with rehabilitation, which then can lead to long term pain relief. Also, for some people the goal is to use non-surgical therapies to manage the pain and avoid major surgery, while for others surgery may be the quickest way to feel better.

Not all treatments work for all conditions or for all individuals with the same condition, and many find that they need to try several treatment options to determine what works best for them. The present stage of the condition (acute or chronic) is also a determining factor in the choice of treatment. Only a minority of back pain patients (most estimates are 1% - 10%) require surgery.

Pain

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Depending on the particular cause of the condition, posture training courses and physical exercises might help with relieving the pain.[30]

  • Exercises can be an effective approach to reducing pain, but should be done under supervision of a licensed health professional. Generally, some form of consistent stretching and exercise is believed to be an essential component of most back treatment programs. However, one study found that exercise is also effective for chronic back pain, but not for acute pain.[31] Another study found that back-mobilizing exercises in acute settings are less effective than continuation of ordinary activities as tolerated.[32]
  • Studies of manipulation suggest that this approach has a benefit similar to other therapies and superior to placebo.[33][34]
  • Acupuncture has some proven benefit for back pain;[35] however, a recent randomized controlled trial suggested insignificant difference between real and sham acupuncture.[36]
  • Education, and attitude adjustment to focus on psychological or emotional causes[37] - respondent-cognitive therapy and progressive relaxation therapy can reduce chronic pain.[38]

Surgery

[edit]

Surgery may sometimes be appropriate for patients with:

Minimally invasive surgical procedures are often a solution for many symptoms and causes of back pain. These types of procedures offer many benefits over traditional spine surgery, such as more accurate diagnoses and shorter recovery times.[39]

Surgery is usually the last resort in the treatment of back pain. It is normally recommended only if all other treatment options have been tried or if the situation is an emergency. A 2009 systematic review of back surgery studies found that, for certain diagnoses, surgery is moderately better than other common treatments, but the benefits of surgery often decline in the long term.[40]

There are different types of surgical procedures that are used in treating various conditions causing back pain. All of them can be classified into nerve decompression, fusion of body segments and deformity correction surgeries.[41] The first type of surgery is primarily performed in older patients who suffer from conditions causing nerve irritation or nerve damage. Fusion of bony segments is also referred to as a spinal fusion, and it is a procedure used to fuse together two or more bony fragments with the help of metalwork. The latter type of surgery is normally performed to correct congenital deformities or those that were caused by a traumatic fracture. In some cases, correction of deformities involves removing bony fragments or providing stability provision for the spine.

The main procedures used in back pain surgery are discetomies, spinal fusions, laminectomies, removal of tumors, and vertebroplasties.

A discetomy is performed when the intervertebral disc have herniated or torn. It involves removing the protruding disc, either a portion of it or all of it, that is placing pressure on the nerve root.[42] The disc material which is putting pressure on the nerve is removed through a small incision that is made over that particular disc. This is one of the most popular types of back surgeries and which also has a high rate of success. The recovery period after this procedure does not last longer than 6 weeks. The type of procedure in which the bony fragments are removed through an endoscope is called percutaneous disc removal.

Microdiscetomies may be performed as a variation of standard discetomies in which a magnifier is used to provide the advantage of a smaller incision, thus a shorter recovery process.

Spinal fusions are performed in cases in which the patient has had the entire disc removed or when another condition has caused the vertebrae to become unstable. The procedure consists in uniting two or more vertebrae by using bone grafts and metalwork to provide more strength for the healing bone. Recovery after spinal fusion may take up to one year, depending greatly on the age of the patient, the reason why surgery has been performed and how many bony segments needed to be fused.

In cases of spinal stenosis or disc herniation, laminectomies can be performed to relieve the pressure on the nerves. During such a procedure, the surgeon enlarges the spinal canal by removing or trimming away excessive lamina which will provide more space for the nerves. The severity of the condition as well as the general health status of the patient are key factors in establishing the recovery time, which may be range from 8 weeks to 6 months.

Back surgery can be performed to prevent the growth of benign and malignant tumors. In the first case, surgery has the goal of relieving the pressure from the nerves which is caused by a benign growth, whereas in the latter the procedure is aimed to prevent the spread of cancer to other areas of the body. Recovery depends on the type of tumor that is being removed, the health status of the patient and the size of the tumor.[41]

Of doubtful benefit

[edit]
  • Cold compression therapy is advocated for a strained back or chronic back pain and is postulated to reduce pain and inflammation, especially after strenuous exercise such as golf, gardening, or lifting. However, a meta-analysis of randomized controlled trials by the Cochrane Collaboration concluded "The evidence for the application of cold treatment to low-back pain is even more limited, with only three poor quality studies located. No conclusions can be drawn about the use of cold for low-back pain"[21]
  • Bed rest is rarely recommended as it can exacerbate symptoms,[43] and when necessary is usually limited to one or two days. Prolonged bed rest or inactivity is actually counterproductive, as the resulting stiffness leads to more pain.
  • Electrotherapy, such as a transcutaneous electrical nerve stimulation (TENS) has been proposed. Two randomized controlled trials found conflicting results.[44][45] This has led the Cochrane Collaboration to conclude that there is inconsistent evidence to support use of TENS.[46] In addition, spinal cord stimulation, where an electrical device is used to interrupt the pain signals being sent to the brain and has been studied for various underlying causes of back pain.[clarification needed]
  • Inversion therapy is useful for temporary back relief due to the traction method or spreading of the vertebrae through (in this case) gravity. The patient hangs in an upside down position for a period of time from ankles or knees until this separation occurs. The effect can be achieved without a complete vertical hang (90 degree) and noticeable benefits can be observed at angles as low as 10 to 45 degrees.[citation needed]
  • Ultrasound has been shown not to be beneficial and has fallen out of favor.[47]

Pregnancy

[edit]

About 50% of women experience low back pain during pregnancy.[48] Back pain in pregnancy may be severe enough to cause significant pain and disability and pre-dispose patients to back pain in a following pregnancy. No significant increased risk of back pain with pregnancy has been found with respect to maternal weight gain, exercise, work satisfaction, or pregnancy outcome factors such as birth weight, birth length, and Apgar scores.

Biomechanical factors of pregnancy that are shown to be associated with low back pain of pregnancy include abdominal sagittal and transverse diameter and the depth of lumbar lordosis. Typical factors aggravating the back pain of pregnancy include standing, sitting, forward bending, lifting, and walking. Back pain in pregnancy may also be characterized by pain radiating into the thigh and buttocks, night-time pain severe enough to wake the patient, pain that is increased during the night-time, or pain that is increased during the day-time. The avoidance of high impact, weight-bearing activities and especially those that asymmetrically load the involved structures such as: extensive twisting with lifting, single-leg stance postures, stair climbing, and repetitive motions at or near the end-ranges of back or hip motion can ease the pain. Direct bending to the ground without bending the knee causes severe impact on the lower back in pregnancy and in normal individuals, which leads to strain, especially in the lumbo-saccral region that in turn strains the multifidus.

Economics

[edit]

Back pain is regularly cited by national governments as having a major impact on productivity, through loss of workers on sick leave. Some national governments, notably Australia and the United Kingdom, have launched campaigns of public health awareness to help combat the problem, for example the Health and Safety Executive's Better Backs campaign. In the United States lower back pain’s economic impact reveals that it is the number one reason for individuals under the age of 45 to limit their activity, second highest complaint seen in physician’s offices, fifth most common requirement for hospitalization, and the third leading cause for surgery.

References

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[edit]

Category:Pain Category:Vertebral column

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