Low Back Pain and Disc Herniation

The discs located between vertebrae are vulnerable to injury, and can cause debilitating pain when injured.  Disc herniation most commonly affects the lumbar spine, but it can also occur in the cervical spine, and rarely, in the thoracic spine.

What is disc herniation?

Disc herniation is a term that refers to displacement of the nucleus pulposus of the intervertebral disc, due to injury or weakening of the external portion of the disc (annulus fibrosis).  The term “slipped disc” often refers to this type of injury, as does bulging disc.

There are four stages of disc herniation, with various degrees of displacement of the nucleus pulposus. The final stage occurs when the annulus fibrosis is completely ruptured and there is a complete loss of integrity of the external structure.

Pain occurs due to increased pressure on the nerves exiting the spinal cord. Symptoms such as pain, numbness and tingling will occur in the area that is supplied by the affected nerves.

How does disc herniation occur

Disc herniation most often occurs due to injury, sometimes from a seemingly innocent action such as bending over or twisting to pick something up. These actions of sudden flexion or rotation often cause an increase in pressure which forces the nucleus pulposus in a posterior (toward the back) direction.

Signs & Symptoms of Disc Herniation

If you’ve ever had an issue with a disc, it is an unforgettable experience.

1. Sudden, excruciating pain – into the legs and buttocks if the herniation occurs in the lumbar spine; into the arms and hands if the herniation occurs in the cervical spine.
2. Muscle spasm will occur in the injured area – this is the body’s protective mechanism to prevent further injury by immobilizing the area.
3. certain actions will increase pain and symptoms, such as bending forward from the hips, side bending, or twisting. As the action causes the pain, a therapist can tell where the bulge is happening by the pain distribution.

How is disc herniation treated?

Disc herniation is a condition that must be managed in the initial stages, with a focus on removing pressure from the affected nerves and pain control.  As the condition progresses, the focus turns to strengthening the supporting structures – if the herniation has occurred in the lumbar spine, core muscle strengthening will be incorporated into a rehabilitation program.

Massage therapy itself is not a standalone therapy for disc herniation – it can help with pain control and removing some of the excess muscle spasm. It must be noted that removing all of the hypertonicity (excess muscle tone) in the muscles surrounding the injured area is not wise – the excess tone in this case is used to stabilize the area, and if it is completely removed, the area can become very unstable and make the injury worse.

If the injury to the intervertebral disc is severe, the condition can become chronic and progress to degenerative disc disease.

For more information, please see The Anatomy of Low Back Pain.

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www.whymassagetherapy.com
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The Anatomy of Low Back Pain

Understanding the anatomy of the lumbar spine is key to understanding and managing low back pain.

The lumbar spine, commonly called the “low back”, consists of 5 vertebrae, and is located between the thoracic spine (which articulate with ribs) and the sacrum. The vertebrae themselves are given numbers by which they are identified, for example – Lumbar Vertebra 1 = L1, Lumbar Vertebra 2 = L2 and so on.

The normal lordotic curve of the low back is known as a secondary curve, and starts to develop in infancy due to weight bearing caused by learning to sit up and walk.  The low back is especially vulnerable to injury due to its weight bearing task and mobility.

Between each vertebrae throughout the whole spine (except for C1 and C2) is a intervertebral or fibrous disc. The purpose of the disc is to provide cushioning and shock absorption from weight bearing and movement. The intervertebral disc is comprised of the annulous fibrosis and the gel-like centre called the nucleus pulposus – these structures are work together to provide the shock absorption, and are both implicated in disc dysfunction and neurological symptoms.

Facet joints are the articulating surfaces of bone between vertebrae. These synovial joints are known as “plane” joints because their flat surfaces glide over each other. These joints may become inflamed due to injury to the joint or joint capsule itself, or due to compression of the intervertebral discs, forcing them to interact in a “close-packed” position. This close packed position means that the joint surfaces are forced closer together than normal, and will irritate the bone and cartilage during movement as they contact each other and create friction.

During an acute injury, the inflamed tissue in the joints may irritate the nerve roots as they exit the spinal cord via the intervertebral foramina. Eventually, if facet irritation is untreated, bony spurs may develop due to chronic inflammation and cause spinal stenosis – a decrease in the size of the “vertebral foramen” or spinal canal.

In the case of a “bulging” or herniated disc, pressure is exerted on the nerve root as it leaves the spinal cord via the intervertebral foramina. This pinching or pressure on the nerve root will cause sharp, shooting pain, especially when the patient leans forward (flexes) from the hip.  Symptoms will present in the areas that the compromised nerves supply.

© Copyright 2009
www.whymassagetherapy.com
All Rights Reserved.