Nerve Root Block

A nerve root block is an injection used to treat pain caused by a swollen or irritated nerve as it leaves the spine. During the procedure, a small amount of local anaesthetic and steroid is injected around the affected nerve root. The anaesthetic provides temporary numbing, while the steroid helps reduce inflammation, which can ease pain and improve movement over the next few days.

Nerve roots are the sections of nerves that branch out from the spinal cord. When something irritates or compresses these nerves, such as a prolapsed (slipped) disc, the nerve root can become swollen and inflamed. This often leads to significant pain in the spine and can also cause referred pain travelling into the arms or legs.

A nerve root injection is given to help settle this inflammation. By reducing swelling around the affected nerve, the injection aims to ease pain and improve your ability to move and function.

You’ll be asked to lie face down on the CT table. Once you’re in position, your back will be cleaned with an antiseptic solution. A radiologist who specialises in this procedure will use CT imaging to guide a fine needle to the correct spot near the affected nerve root.

A small amount of contrast dye may be injected to confirm the needle is in the right place. Once confirmed, a mixture of local anaesthetic and cortisone is injected around the nerve.

The cortisone usually begins working after two to three days. Pain relief commonly lasts between three and six months.

All medical procedures carry some risks, but complications from a nerve root block are generally uncommon. The most common side effects include mild discomfort, redness or bruising at the injection site. These usually settle within a few days.

Some patients may also experience temporary tingling or numbness in the area supplied by the treated nerve. This sensation can extend down the arm or leg, depending on where the injection is given. It usually disappears within a few hours and is typically caused by temporary irritation of the nerve root during the procedure.

Please arrange for someone to take you home, as you shouldn’t drive for at least six hours after the procedure.

It’s common to feel some tenderness or notice mild bruising at the injection site. Applying ice and taking paracetamol can help relieve these symptoms. Avoid strenuous activity or exercise for up to a week, or follow your doctor’s specific advice on when it’s safe to return to normal activities.

If you develop a fever, swelling, warmth at the injection site, or increasing pain more than 48 hours after the procedure, contact your doctor immediately.

Please bring the following items to help us process your appointment smoothly and ensure we have all the information we need:

• Your referral from your doctor or health care professional

• Your Medicare card

• Your Pension or Concession card, if you have one

• Any previous scans or X-rays related to your condition

• WorkCover or Motor Vehicle Accident claim details, including your claim number and the name of your employer or insurer, if this applies to you

Having these documents ready helps us provide accurate, timely care.