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Lumbosacral Syndrome

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What is the lumbosacral syndrome?

This is a disease that occurs at the lumbosacral junction. The term "lumbo" refers to the lumbar vertebrae. These are the bones in the lower part of the spinal column. The term "sacral" refers to the sacrum, which is the part of the spine that joins the lumbar spine and the pelvis. The lumbosacral syndrome is an instability at this strategic point in the spine.

This disease is also known as the cauda equina syndrome. This term comes from Latin words that mean "horse's tail." At this level, the spinal cord is no longer a tubular structure. Instead, it is a collection of large nerves that have the appearance of a horse's tail.

What causes it?
Pressure on the cauda equina or the nerves that exit the spine is the mechanism causing the clinical signs. The cause of the pressure may be a narrowed spinal canal, an infection in the disk at this joint, trauma, a spinal tumor, or instability at this joint.

What are the clinical signs?

When instability exists along the spine, abnormal movement occurs. This causes inflammation to the nerves leaving the spinal cord and to the muscles in the immediate area. Affected dogs are in pain and exhibit it in various ways. When pressure is applied to the muscles in the lower back, many dogs will cry or move away. Some dogs may be very slow to rise from a lying position because this movement aggravates the inflamed nerves and muscles. Some will literally fall to their knees when the tail is lifted sharply. Occasionally, dogs develop weakness or lameness in the rear legs with muscle atrophy. Others become fecal or urinary incontinent, and some will mutilate their feet or tail with incessant chewing.

As the problem progresses, the disk that is located between the last lumbar vertebrae and the sacrum may rupture. If this happens, the dog will be incoordinated when it walks, or it may be paralyzed in the rear legs.

How is it diagnosed?

Radiographs (x-rays) will generally reveal arthritic changes at the lumbosacral junction. However, this is common in many dogs and may not cause any clinical signs. If the disk ruptures, there may be evidence of a narrowed disk space or disk material against the spinal cord. However, these offer only indirect evidence.

If the clinical signs are correct and the initial radiographs are suggestive of the lumbosacral syndrome, a special radiographic study, called an epidurogram, is performed. This is the injection of contrast material around the spinal cord so that pressure on the spinal cord can be detected on subsequent radiographs.

What is the treatment?

If your dog is overweight, weight reduction will be an important part of the treatment. Any disorder of the back is aggravated by excessive body weight.
Strict rest is also an important part of treatment for any back problem. Cage rest is preferable, but confinement in a small fenced run or small room is acceptable.

Anti-inflammatory drugs and pain relievers will often give temporary relief.

Although infection in the disk is not a common cause, it should be treated with appropriate antibiotics if it is present. An infection of this nature usually requires 4-8 weeks of therapy.

If the disk ruptures, many dogs will become incoordinated when they walk, or they may even become paralyzed in the rear legs. If this occurs, surgery is indicated. The surgical procedure, called a dorsal laminectomy, is to relieve the pressure of a bulging or ruptured disk from the spinal cord. It also permits identification of a spinal tumor or a narrowing of the spinal canal due to traumatic injury. Once the pressure is relieved, return of function of the rear legs is expected. However, permanent damage to the spinal cord will not be reversed, and the surgery does not relieve inflammation around the spinal nerves or the muscles. Continued pain relievers or anti-inflammatory drugs may be needed until this aspect of the problem finally resolves.