Epidural Injections

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This fact sheet relates to epidural injections, a type of pain relieving injection which is performed at Melbourne Radiology Clinic. The injection relieves pain by delivering pain reducing medication to the affected area. A CT (Computed Tomography) scan will be used to guide the procedure.

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Introduction

Epidural injections are used to treat neck, back, arm and leg pain, depending on which level the needle is placed and exactly where in the epidural space.

The three main types of epidural treatment are:

  1. An interlaminar epidural is used to mainly treat the lower back at a specific level.
  2. A caudal epidural is used to treat back pain and sciatica and targets multiple levels at once. This procedure is therefore useful in patients who have multiple levels that contribute to their pain.
  3. A transforaminal epidural is when the injection is delivered to a specific nerve root to assist in relieving sciatica and is similar to a selective nerve root block/perineural injection.

Preparation

Risks

Risks of spinal procedures are rare and include:

The Procedure

You will be asked to wear a gown with the selected area of the spine exposed. Spinal injection procedures are completed with you lying face down in a CT scanner. We will ensure that you are as comfortable as possible.

A series of planning images are performed, with the area of needle entry planned on the computer terminal and then marked on your skin. The radiologist will then clean your skin with an antiseptic wash and inject local anaesthetic into the injection site. This results in a stinging sensation which is temporary until the skin becomes numb, usually taking 10-30 seconds.

A fine needle is then passed through the skin and tissues, constantly manipulated under CT guidance until it enters the intended epidural space.

Gas or contrast is then injected to confirm the correct depth of the needle, which may result in some transient back pain. Once confirmed, a mixture of cortisone and local anaesthetic is injected, which often results in an increased pressure sensation within the back and/or leg pain, usually described as a burning sensation.

The cortisone decreases the inflammation in the epidural space which is responsible for your symptoms.

Example:
CT guided caudal epidural injection in a patient with severe intractable back pain following spinal surgery. The needle is demonstrated within the sacral epidural space, with contrast injected to confirm position. The procedure is used in patients with multiple levels of nerve compression.

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Important information to tell your doctor prior to treatment

Serious side effects are rare, however if you have an existing condition, this must be discussed with your referring doctor before having treatment. People with local skin or systemic infections are at greater risk of having an infection spreading into the spine after spinal injection treatment. Therefore, if you have a skin infection, which may include wounds, boils or rashes, please tell your doctor or arrange to have the procedure performed at a later date.

Following the procedure

At most, you will feel some minor discomfort in the back. As local anaesthetic has been injected into the spine, most patients will be pain free, however the local anaesthetic that has also been administered into the epidural space frequently comes into contact with adjacent nerves and may result in your arm or leg (depending one whether the nerves in the neck or lower back have been injected) feeling numb, heavy, clumsy, weak or even cold. This usually reverses in approximately 20-40 minutes.

Most patients are observed in the clinic for at least 30 minutes and are discharged after this point only if walking safely and feeling well. You should not drive for the rest of the day. The following day you may return to work and gradually increase your activities.

Note

Please discuss any medical illnesses with your doctor before booking the recommended procedure.

Follow up

The radiologist conducting the spinal injection will send your referring doctor a report.

REMEMBER ...

Whilst every effort is made to keep your appointment time, the special needs of complex cases, elderly and frail patients can cause unexpected delays. Your consideration and patience in these circumstances is appreciated.