Sciatica Specialist: Lumbar Herniated Disc Anatomy

A common cause of lower leg and back pain is a ruptured disc or herniated disc. Symptoms of a herniated disc may include muscle spasm or cramping sharp or dull pain, sciatica, and leg weakness or loss of leg work. Sneezing, coughing, or bending intensify the pain.

Rarely, bowel or bladder control is lost, and when this happens, seek medical attention at once.

Sciatica is a symptom often associated with a lumbar herniated disc. Stress on one or several nerves that contribute to the sciatic nerve can lead to pain, burning, tingling, and numbness that extends from the buttocks into the leg and into the foot. Normally one side (left or right) is affected.

Anatomy of Lumbar Spine Discs

First, a brief overview of spinal anatomy so that you can better understand the way the lumbar herniated disc may lead to lower back pain and leg pain.

In between each of the 5 lumbar vertebrae (bones) is a disc, a tough, fibrous shock-absorbing pad. Endplates line the endings of every vertebra and help hold discs in place. Every disc includes a tire-like outer ring (annulus fibrosus) that encases a gel-like material (nucleus pulposus).

Disc herniation occurs when the annulus fibrous breaks open or cracks, permitting the nucleus pulposus to escape. Though you may have heard it be called a ruptured disc or even a bulging disc, this is called a herniated nucleus pulposus or herniated disc.

When a disc herniates, it can press on the spinal cord or spinal nerves. All along your spine, nerves are branching off from the spinal cord and travelling to various parts of your body. The nerves pass through small passageways between the vertebrae and discs, so if a herniated disc presses into that passageway, it can compress (or “pinch”) the nerve. This can result in the pain associated with herniated discs. (In the case below, you can observe a close-up look at a herniated disc pressing on a spinal nerve.)

Lumbar Herniated Disc Risk Factors

Many factors can increase the risk for disc herniation, including:

• Lifestyle choices like tobacco use, lack of regular exercise, and insufficient nourishment significantly contribute to inadequate disc health.
• As the body ages, natural chemical modifications cause discs to slowly dry out, which can impact disc strength and resiliency. To put it differently, the aging process can make your discs less capable of absorbing the shock from the body’s movements, which is one of their most important jobs.
• Poor posture combined with the habitual use of incorrect body mechanics stresses the lumbar spine and influences its usual ability to take the bulk of the body’s weight.

Combine these factors with the eeffects from daily wear and tear, injury, incorrect lifting, or twisting and it is simple to comprehend why a disc may herniate. For example, lifting something incorrectly may lead to disc pressure.

Disc Herniation Phases

A herniation may develop suddenly or slowly over weeks or months. The four phases to a herniated disc are:

1) Disc Degeneration: Chemical modifications related to aging causes discs to weaken, but with no herniation.
2) Prolapse: The form or position of the disc changes with a few small impingement into the spinal canal and/or spinal nerves. This stage is also referred to as a bulging disc or a disc that was protruding.
3) Extrusion: The gel-like nucleus pulposus breaks through the tire-like wall (annulus fibrosus) but remains within the disc.
4) Sequestration or Sequestered Disc: The nucleus pulposus fractures throughout the annulus fibrosus and can then go outside the intervertebral disc.

Lumbar Herniated Disc Diagnosis

Lately, not every herniated disc causes symptoms. Some people discover they have a ruptured disc or herniated disc after an x-ray for an unrelated reason.

Most of the time, the symptoms, notably the pain, prompt the patient to seek medical attention. The trip with the doctor includes a physical exam and neurological exam. He or she will examine your medical history, and inquire about what remedies you have tried for pain relief and what symptoms you’ve experienced.

An x-ray may be needed to rule out other causes of back pain like osteoarthritis (spondylosis) or spondylolisthesis. A CT or MRI scan verifies the extent and location of disc damage.These imaging tests can show the soft tissues (including the disc).

Sometimes a myelogram is essential. In that evaluation, you will receive an injection of a dye; the dye will appear on a CT scan, so allowing your physician to readily see problem areas.

The scope of our information is limited to chiropractic and spinal injuries and conditions. To discuss options on the subject matter, please feel free to ask Dr. Jimenez or contact us at 915-850-0900 . 

By Dr. Alex Jimenez

Additional Topics: Sciatica

Lower back pain is one of the most commonly reported symptoms among the general population. Sciatica, is well-known group of symptoms, including lower back pain, numbness and tingling sensations, which often describe the source of an individual’s lumbar spine issues. Sciatica can be due to a variety of injuries and/or conditions, such as spinal misalignment, or subluxation, disc herniation and even spinal degeneration.

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