A Piriformis Injection is an injection of a long lasting steroid into the piriformis muscle in the pelvis. The injection is guided by a CT scanner and will help reduce inflammation or swelling around the nerves that pass near or through the piriformis muscle, often diagnosed as Piriformis Syndrome. This treatment may reduce leg and buttock pain, numbness, tingling or other symptoms that may contribute to nerve inflammation, irritation or swelling.
What happens during a Piriformis Injection?
A. Before your scan
What to bring
Your request form
Any relevant previous imaging
Your Medicare card and any concession cards
Preparation – In the week before your scan
You must advise us of any blood-thinning medication your are taking such as Aspirin, Warfarin, Plavix or Iscover and stop taking it for a period of time before your treatment. Please contact us for advice.
Preparation – the day of your scan
There is no specific preparation and you may eat and drink as desired before and after the procedure. You will be asked to fill out a questionnaire regarding your health status, medication, and any known allergies. If there is any chance you may be pregnant, please inform us before your scan. You may also be asked to change into a gown and remove some jewellery for your scan.
B. During your Piriformis Injection
When you are transferred to the CT room you will be made comfortable on the examination table. The examination table slides you into the centre of the CT machine and some preliminary pictures are taken to confirm the scan position and the area of needle entry marked on your skin.
Your skin will then be cleaned and a local anaesthetic will be injected into site. This may temporary sting until the skin becomes numb (up to 30 seconds).
The radiologist will then insert a fine needle through the skin and tissues guided by images on the CT scanner, until it is in the correct area. Gas or contrast (x-ray dye) is then injected to confirm the correct depth of the needle. Once confirmed, a mixture of cortisone and local anaesthetic is injected. You may feel a sensation of pressure or a burning sensation.