| Spinal Disc Herniation |
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A spinal disc herniation, incorrectly called a "'''slipped disc'''", is a Medical condition affecting the Spine , in which a tear in the outer, fibrous ring ('' Annulus Fibrosus '') of an Intervertebral Disc allows the soft, central portion ('' Nucleus Pulposus '') to Bulge Out . It is normally a further development of a previously existing disc protrusion, a condition in which the outermost layers of the ''annulus fibrosus'' are still intact, but can bulge when the disc is under pressure. TERMINOLOGY e.]] Some of the terms commonly used to describe the condition include herniated disc, prolapsed disc, ruptured disc, and the misleading expression "slipped disc." Other terms that are closely related include disc protrusion, bulging disc, pinched nerve, Sciatica , disc disease, disc degeneration, Degenerative Disc Disease , and black disc. "What is a herniated disc, bulging disc, ..." . The popular term "slipped disc" is quite misleading, as an intervertebral disc, being tightly sandwiched between two and damages the disc between the two vertebrae. The spelling "disc" is based on the Latin root ''discus''. Most English language publications use the spelling ''"disc"'' more often than "disk." Nomina Anatomica designates the structures as ''"disci intervertebrales"'' form and Terminologia Anatomica as ''"discus intervertebralis/ Intervertebral Disc ,"'' form . Terminology REGIONAL DISTRIBUTION Frequency Disc herniation can occur in any disc in the spine, but the two most common forms are the cervical disc herniation and the lumbar disc herniation. The latter is the most common, causing lower back pain ( Lumbago ) and often leg pain as well, in which case it is commonly referred to as Sciatica . Lumbar disc herniation occurs 15 times more often than cervical (neck) disc herniation, and it is one of the most common causes of lower back pain. The cervical discs are affected 8% of the time and the upper-to-mid-back (thoracic) discs only 1 - 2% of the time. Frequency The following locations have no discs and are therefore exempt from the risk of disc herniation: the upper two cervical intervertebral spaces, the Sacrum , and the Coccyx . Most disc herniations occur when a person is in their thirties or forties when the nucleus pulposus is still a gelatin-like substance. With age the nucleus pulposus changes ("dries out") and the risk of herniation is greatly reduced. After age 50 or 60, Osteoarthritic degeneration or Spinal Stenosis are more likely causes of Low Back Pain or leg pain. Cervical disc herniation Cervical disc herniations occur in the neck, most often between the sixth and seventh cervical vertebral bodies. Symptoms can affect the back of the skull, the neck, shoulder girdle, scapula 1, shoulder, arm, and hand. The nerves of the Cervical Plexus and Brachial Plexus can be affected. Cervical herniation Thoracic disc herniation Thoracic discs are very stable and herniations in this region are quite rare. Herniation of the uppermost thoracic discs can mimic cervical disc herniations, while herniation of the other discs can mimic lumbar herniations. Thoracic herniation Lumbar disc herniation Lumbar disc herniations occur in the lower back, most often between the fourth and fifth lumbar vertebral bodies or between the fifth and the Sacrum . Symptoms can affect the lower back, Buttocks , Thigh , and may radiate into the Foot and/or Toe . The Sciatic Nerve is the most commonly affected nerve, causing symptoms of Sciatica . The Femoral Nerve can also be affected. Lumbar herniation Can cause the patient to experience a numb, tingling feeling throughout one or both legs and even feet. CAUSES Causes of a disc herniation can include general wear and tear on the disc over time, repetitive movements, stress on the disc that occurs while twisting and lifting, genomic susceptibility, or other injuries. SYMPTOMS The Chief Complaint for spinal disc herniation is leg pain greater than Lower Back Pain , symptoms of a herniated disc can vary depending on the location of the herniation and the types of soft tissue that become involved. They can range from little or no pain if the disc is the only tissue injured to severe and unrelenting neck or Low Back Pain that will radiate into the regions served by an affected nerve root when it is irritated or impinged by the herniated material. Other symptoms may include sensory changes such as numbness, tingling, muscular weakness, paralysis, Paresthesia , and affection of reflexes. If the herniated disk is of the Lumbar region the patient may also experince Sciatica due to irritation of the Sciatic Nerve . Unlike a pulsating pain or pain that comes and goes, which can be caused by muscle spasm, pain from a herniated disc is usually continuous. It is possible to have a herniated disc without any pain or noticeable symptoms, depending on its location. If the extruded nucleus pulposus material doesn't press on soft tissues or nerves, it may not cause any symptoms. It has been estimated that as many as 50% of the population have focal herniated discs in their cervical region that do not cause noticeable symptoms. Symptoms Typically, symptoms are experienced only on one side of the body. If the prolapse is very large and presses on the spinal cord or the Cauda Equina in the lumbar region, affection of both sides of the body may occur, often with serious consequences. DIAGNOSIS Diagnosis is made by a practitioner based on the history, symptoms, and Physical Examination . At some point in the evaluation, tests may be performed to confirm or rule out other causes of symptoms such as Spondylolisthesis , degeneration, Tumor s, Metastases and space-occupying lesions as well as evaluate the efficacy of potential treatment options. Physical examination The Straight Leg Raise may be positive; however, this finding has low Specificity . Imaging
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