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A prolapsed (herniated) disc occurs when the outer fibres of the intervertebral disc are injured, and the soft material known as the nucleus pulposus, ruptures out of its enclosed space.
The prolapsed disc or ruptured disc material can enter the spinal canal, squashing the spinal cord, but more frequently the spinal nerves.
Herniated discs rarely occur in children, and are most common in young and middle-aged adults. A herniation may develop suddenly, or gradually over weeks or months.
The symptoms of a herniated or prolapsed disc may not include back or neck pain in some individuals, although such pain is common.
In severe cases, loss of control of bladder and/or bowels, numbness in the genital area, and impotence (in men)
Numbness, pins and needles, or tingling in one or both arms or legs
Pain behind the shoulder blade(s) or in the buttock(s)
Pain running down one or both arms or legs
The location of these symptoms depends upon which nerve(s) has been affected. In other words, the precise location of the
symptoms helps determine your diagnosis.
Weakness involving one or both arms or legs
Falling from a significant height and landing on your buttocks. This can transmit significant force across the spine. If the force is strong enough, either a vertebra (bone) can fracture, or an intervertebral disc can rupture.
Bending forwards places substantial stress on the intervertebral discs. If you bend and attempt to lift an object which is too heavy, this force may cause a disc to rupture.
Intervertebral discs can also rupture as a result of weakening outer fibres of the disk. This is usually due to repetitive minor injuries which build up over time. This damage may occur with aging, hereditary factors, work- or recreation-related activities. Often there is no obvious reason why such a process should have occurred. Then at some point you may lift something, twist or bend in a manner which puts enough pressure on the disc to cause it to rupture through its weakened outer fibres.
Intervertebral disc prolapses most commonly occur in the lumbar spine (lower back) and cervical spine (neck). Less commonly, they occur in the thoracic spine (mid-back region).
Direct pressure. The disc material that has ruptured into the spinal canal or intervertebral foramen can put pressure on the nerves (or spinal cord).
Chemical irritation. Once ruptured, the core material of the disc can cause a chemical irritation of the nerve roots and result in inflammation of the nerves.
Both the pressure on the nerve root and the chemical irritation can lead to problems with how the nerve root works.
Diagnosing a prolapsed disc begins with your specialist taking a complete history of the problem. This is often completed by a relevant physical examination.
Did you have an injury before the pain started?
Exactly where is the pain?
Is there any numbness or pins and needles?
Is there any weakness?
Have you had a similar problem before?
Has there been any weight loss, fevers, or other illnesses recently?
Finally, your neurosurgeon or spinal surgeon will be interested in knowing if you have problems walking, or when you have to empty your bladder or open your bowels. These questions may appear irrelevant, but they are important to ensure there is no significant pressure from the herniated disc on the spinal cord or nerves to the bowels and bladder. Such symptoms may indicate an emergency, and require immediate investigation and/or surgery.
A definite diagnosis is made by radiological investigations. CT scans will usually reveal significant disc prolapses, however these are often not the most reliable tests.
An MRI scan is the most accurate test, however small prolapses may be missed, particularly as most of these investigations are performed while you are lying flat – this places less pressure on the disc and may show less bulging than when you are sitting.
Other investigations that your neurosurgeon or spinal surgeon may organise include a CT myelogram (where dye is injected into the spinal canal and a CT performed), and a nerve sheath injection with local anaesthetic (this may confirm exactly which nerve is generating your symptoms.
At least 80 or 90% of disc prolapses settle by themselves and their symptoms almost disappear. Typically this process takes 6-8 weeks, but may take longer.
Unless there is evidence of significant spinal cord or nerve root compression or impaired function, acute disc prolapses are almost always treated conservatively in the first instance. A combination of anti-inflammatory and paracetamol-based medications is usually recommended, together with a program of physiotherapy, and sometimes hydrotherapy and pilates.
If the symptoms do not settle with reasonable conservative treatment, intervention may be recommended. This may include a nerve sheath injection with local anaesthetic (steroids have not been shown to provide additional benefit), or surgery. Surgery has been shown to speed recovery following disc prolapse.
The treatment offered to each individual will be tailored to their clinical presentation, radiological findings, and other circumstances.
Your neurosurgeon or spinal surgeon will provide you with a treatment program based on your particular situation, and this will be reviewed periodically.
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