The spine (vertebral column) is made up of several bones called vertebrae which are stacked one upon another. Each vertebra is joined to the vertebrae above and below by two pairs of joints called the facet joints situated on the two sides. The typical vertebra has a solid body in front and two plate-like structures on two sides at the back called laminae. The laminae meet in the midline to form a protrusion, the spinous process, which can be felt through the skin of the back. On the two sides each lamina is joined to the body of the vertebra by a short bony stud called the pedicle, thus completing a bony ring. These rings inside each vertebra join together to form a tube called the spinal canal through which passes the spinal cord and the nerve roots.
A small gap, the intervertebral foramen, is present in between the adjacent pedicles for the passage of the nerve roots. These nerve roots are the connections that carry all sensations from the body to the brain and also bring commands from the brain to muscles resulting in movement. In between two adjacent vertebral bodies there is a strong rubber like tissue (Cartilage), resembling a washer, called the intervertebral disc. The nerve root in the intervertebral foramen lies just behind the disc. A disc has a stronger outer part called the annulus fibrosus and a softer jelly-like central part called the nucleus pulposus. When a patient has a prolapsed disc, the central soft part of the disc bulges out and can press on the nerve root/s.
Cervical Spine (Neck):
Cervical radiculopathy is a condition in which there is compression of the nerves that connect the upper limbs with the spinal cord at the neck. Patients usually present with neck pain which spreads to the shoulders and arms. Pain may be associated with tingling, numbness, pins and needles sensation, and weakness of the upper limbs. If neglected there may be weakness with wasting and loss of sensation of the limbs and even complete paralysis. The commonest cause of such compression of the nerves is a degenerative condition of the spine referred to as Cervical Spondylosis. In this condition changes occur in the intervertebral discs including loss of height and loss of its capacity to hold water. The body responds to these changes by forming extra bone, called spurs, around the affected disc to strengthen it. The loss in disc height and the bony spurs collectively narrow the area and pinch the nerves. Protrusion of parts of the degenerated disc can also cause or aggravate the pressure on the nerves (slipped disc/ prolapsed disc).
Dorsal/ Thoracic Spine (Back):
Lumber Spine (Low back):
The nerve roots that connect the lower part of the trunk and the lower limbs to the spinal cord and brain lie in the lumbar spinal canal. These nerves are responsible for power and sensation of the legs and the buttocks and genitalia along with the control of bladder, bowel and sexual functions.
Lumbar radiculopathy is often caused by a prolapsed disc causing low back pain with radiation to the leg/s. Pain may be associated with tingling, numbness, pins and needles like sensation and weakness of the leg/s. In most cases, the symptoms ease off gradually over several weeks with analgesics, good physiotherapy and normal activities. Surgery is an important option if the symptoms persist or progress.
Other Spinal Procedures:
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