Back pain
|
Different regions (curvatures) of the vertebral column
|
| ICD-10 |
M54 |
| ICD-9 |
724.5 |
| DiseasesDB |
15544 |
| MedlinePlus |
007425 |
| MeSH |
D001416 |
Back pain 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 arms and hands as well as the legs or feet, and may include symptoms other than pain. These symptoms may include tingling, weakness or numbness.
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] Low back pain causes 40% of missed days of work in the United States.[2] Additionally, it is the single leading cause of disability worldwide.[3]
The spine is a complex interconnecting network of nerves, joints, muscles, tendons and ligaments, all of which 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.[4]
Contents
- 1 Classification
- 2 Associated conditions
- 3 Causes
- 4 Diagnosis
- 5 Management
- 5.1 Pain
- 5.2 Surgery
- 5.3 Of doubtful benefit
- 6 Pregnancy
- 7 Economics
- 8 References
- 9 External links
Classification
Back pain can be divided anatomically: neck pain, middle back pain, lower back pain or tailbone pain.
By its duration: acute (up to 12 weeks), chronic (more than 12 weeks) and subacute (the second half of the acute period, 6 to12 weeks).[5]
By its cause: nonspecific back pain, back pain with radiculopathy or spinal stenosis, and back pain associated with another specific cause (such as infection or cancer).[6] Non specific pain indicates that the cause is not known precisely[7] but is believed to be due from the soft tissues such as muscles, fascia, and ligaments.[8]
Back pain is classified according to etiology in mechanical or nonspecific back pain and secondary back pain. Approximately 98% of back pain patients are diagnosed with nonspecific acute back pain which has no serious underlying pathology. 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.[9]
Associated conditions
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 from two weeks to three months.
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.
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.[10][11][12][13] Other studies suggest that for as many as 85% of cases, no physiological cause can be shown.[14][15]
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.[16][17][18][19]
Causes
There are several potential sources and causes of back pain.[20] 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 lower 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.[20] 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.[21] The anterior ligaments of the intervertebral disc are extremely sensitive, and even the slightest injury can cause significant pain.[22]
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.
Diagnosis
In most cases of low back pain medical consensus advises not seeking an exact diagnosis but instead beginning to treat the pain.[23] This assumes that there is no reason to expect that the person has an underlying problem.[23] In most cases, the pain goes away naturally after a few weeks.[23] Typical people who do seek diagnosis through imaging are not likely to have a better outcome than those who wait for the condition to resolve.[23]
In cases in which the back pain has a persistent underlying cause, such as a specific disease or spinal abnormality, then it is necessary for the physician to differentiate the source of the pain and advise specific courses of treatment.
Management
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
- Heat therapy is useful for back spasms or other conditions. A meta-analysis of studies by the Cochrane Collaboration concluded that heat therapy can reduce symptoms of acute and sub-acute low-back pain.[24] Some patients find that moist heat works best (e.g. a hot bath or whirlpool) or continuous low-level heat (e.g. a heat wrap that stays warm for 4 to 6 hours). Cold compression therapy (e.g. ice or cold pack application) may be effective at relieving back pain in some cases.
- Use of medications in chronic back pain is controversial. The short term use of muscle relaxants is effective in the relief of acute back pain.[25] Opioids have not been shown to be better than placebo for chronic back pain when the risks and benefits are considered.[26] Non-steroidal anti-inflammatory drugs (NSAIDs/NSAIAs)[27] have been shown to be more effective than placebo, and are usually more effective than paracetamol (acetaminophen). There is insufficient clinical trials to determine if injection therapy, usually with corticosteroids, helps in cases of low back pain.[28]
- Back schools appear to improve pain as compared to standard treatments.[29]
- Massage may help for those who have had a relatively long period of low back pain.[30] Acupressure or pressure point massage may be more beneficial than classic (Swedish) massage.[30]
Depending on the particular cause of the condition, posture training courses and physical exercises might help with relieving the pain.
- 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][35]
- Acupuncture has some proven benefit for back pain;[36] however, a recent randomized controlled trial suggested insignificant difference between real and sham acupuncture.[37]
- Education, and attitude adjustment to focus on psychological or emotional causes[38] - respondent-cognitive therapy and progressive relaxation therapy can reduce chronic pain.[39]
Surgery
Surgery may sometimes be appropriate for patients with:
- Lumbar disc herniation or degenerative disc disease
- Lumbar spinal stenosis from lumbar disc herniation, degenerative joint disease, or spondylolisthesis
- Scoliosis
- Compression fracture
Surgery is usually the last resort in the treatment of back pain. It is usually only recommended if all other treatment options have been tried or in an emergency situation. 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]
The main procedures used in back pain surgery are discetomies, spinal fusions, laminectomies, removal of tumors, and vertebroplasties.
There are different types of surgical procedures that are used in treating various conditions causing back pain. Nerve decompression, fusion of body segments and deformity correction surgeries are examples. 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. A time-tested procedure to repair common intervertebral disc lesions which offers rapid recovery (just a few days) involves the simple removal of the fibrous nucleus of the affected intervertebral disc.[41] Various techniques, such as in the following paragraph, are described in the literature.
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 the 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.
Of doubtful benefit
- 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"[24]
- Bed rest is rarely recommended as it can exacerbate symptoms,[43][44] 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.[45][46] This has led the Cochrane Collaboration to conclude that there is inconsistent evidence to support use of TENS.[47] In addition, spinal cord stimulation, where an electrical device is used to interrupt the pain signals being sent to the brain, 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.[48]
- Ultrasound has been shown not to be beneficial and has fallen out of favor.[49]
Pregnancy
About 50% of women experience low back pain during pregnancy.[50] 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
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.
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External links
- Back and spine at DMOZ
- Handout on Health: Back Pain at National Institute of Arthritis and Musculoskeletal and Skin Diseases
- Back pain on MedlinePlus, US National Library of Medicine
- Back pain, American Academy of Orthopaedic Surgeons summary
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| Back |
|
|
|
| Tests |
- Cold pressor test
- Dolorimeter
- Hot plate test
- Tail flick test
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|
| Related concepts |
- Anterolateral system
- Pain management
- Pain scale
- Pain threshold
- Pain tolerance
- Posteromarginal nucleus
- Substance P
- Suffering
- OPQRST
- Philosophy of pain
- Cancer pain
- Drug-seeking behavior
|
|
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|
anat (n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp
|
noco (m/d/e/h/v/s)/cong/tumr, sysi/epon, injr
|
proc, drug (N1A/2AB/C/3/4/7A/B/C/D)
|
|
|
|
anat (h/r/t/c/b/l/s/a)/phys (r)/devp/prot/nttr/nttm/ntrp
|
noco/auto/cong/tumr, sysi/epon, injr
|
|
|
|
|
|
Dorsopathies/spinal disease (M40–M54, 720–724, 737)
|
|
| Deforming dorsopathies |
| Spinal curvature |
- Kyphosis
- Lordosis
- Scoliosis
|
|
| Other |
- Scheuermann's disease
- Torticollis
|
|
|
| Spondylopathy |
- inflammatory: Spondylitis
- Sacroiliitis
- Discitis
- Spondylodiscitis
- Pott disease
- noninflammatory: Spondylosis
- Spondylolysis
- Spondylolisthesis
- Spinal stenosis
- Facet syndrome
|
|
| Back pain |
- Neck pain
- Upper back pain
- Low back pain
|
|
| Intervertebral disc disorder |
- Schmorl's nodes
- Degenerative disc disease
- Spinal disc herniation
|
|
|
|
|
noco (arth/defr/back/soft)/cong, sysi/epon, injr
|
|
|
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|
