Cauda Equina Syndrome: When lower back pain becomes an emergency

Sep 11, 2016 News

By Dr Zulfikar Bux

Assistant Professor of Emergency Medicine

The cauda equina is a bundle of nerves that spread out from the bottom of the spinal cord at your lower

Dr Zulfikar Bux

back.The primary function of the cauda equina is to send and receive messages between the lower limbs and the pelvic organs, which consist of the bladder, the rectum, and the internal genital organs.

Cauda equina syndrome is the medical term for a group of symptoms that happen when some of the nerves in the cauda equina get squeezed or damaged.This condition is considered serious, as the patient could permanently lose the functions of their bowel and bladder, and can lead to permanent paralysis of the legs. This is a condition most often ignored by patients until it becomes complicated.

WHAT ARE THE SYMPTOMS OF CAUDA EQUINA SYNDROME?

The symptoms of cauda equina syndrome include:

Pain, numbness, or tingling in the lower back and spreading down one or both legs
Leg weakness or a problem called “foot drop,” which is when you cannot seem to hold your foot up (for example, while walking)
Problems with bowel or bladder control
Problems with sex

WHAT CAUSES CAUDA EQUINA SYNDROME?

To understand the causes of cauda equina syndrome, it’s helpful to first learn a little about the back and spine.

The back is made up of:

Vertebrae – A stack of bones that sit on top of one another like a stack of coins. Each of these bones has a hole in the centre. When stacked, the bones form a hollow tube that protects the spinal cord.
Spinal cord and nerves – The spinal cord runs through the vertebrae. Nerves branch from the spinal cord and pass in between the vertebrae. From there they connect to the arms, the legs, and the organs. (This is why problems in the back can cause leg pain or bladder problems.)
Discs – Rubbery discs sit in between each of the vertebrae to add cushion and allow movement. The discs that sit between the vertebrae have a tough outer shell and jelly-like centre. The outer shell of the discs can sometimes break open, spilling the jelly material inside. This is what doctors call a “herniated disc.”
Muscles, tendons, and ligaments – Together the muscles, tendons, and ligaments are called the “soft tissues” of the back. These soft tissues support the back and help hold it together.

Cauda equina syndrome can happen because of changes in the back that affect the nerves. For example, cauda equina syndrome can happen because of:

A herniated disc – The material from a ruptured disc can press on or irritate the nerves in the cauda equina. This commonly occurs after injuring your back.
Infection or inflammation – Different types of infection or inflammation can damage or irritate nerves in the cauda equina.
Cancer – In people with cancer, tumors can form within the spine and press on the nerves in the cauda equina.
Spinal stenosis – Spinal stenosis is a condition in which the vertebrae form bumps called bone spurs. These bumps can squeeze or press on the nerves in the cauda equina. In people with spinal stenosis, the discs between the vertebrae also tend to dry up and shrink. That causes the space between the vertebrae to get smaller, sometimes pinching nerves.

SHOULD I SEE A DOCTOR?

Yes, if you have symptoms of cauda equina syndrome, see a doctor right away. Cauda equina syndrome is a medical emergency.

WILL I NEED TESTS?

Yes. Your doctor or nurse will need to find out what is causing your symptoms. You will likely have an MRI. This is an imaging test that can create detailed pictures of the spinal cord and nearby tissues.

HOW IS CAUDA EQUINA SYNDROME TREATED?

Treatment for cauda equina syndrome involves treating whatever is affecting the nerves and causing the symptoms. Often, that means having surgery to remove bits of bone or discs, or tumours. If the cause of the cauda equina syndrome is a tumour, radiation to shrink the tumour might be an option. If the cause is an infection or inflammation, medicines to treat those problems might be needed.

Most often your first symptom is lower back pain which then progresses to the other symptoms mentioned. Do not ignore your back pain, especially if you are having any of the other associated symptoms of cauda equina syndrome. Visit your doctor as soon as possible.

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