Piriformis Nerve Block

A piriformis block is an injection of local anesthetic into the piriformis muscle of the buttock. Tightness in the piriformis muscle can cause sciatica, which is pain down the back of the leg. There may also be pain symptoms in the hip and low back and even in the groin.

In some cases a steroid medication may also be injected. The steroid medication injected will help reduce the inflammation or swelling around the nerves that pass near or through the piriformis muscle. This may help reduce your pain, numbness, or tingling.

All injections are performed under fluoroscopy (x-ray) or ultrasound-guidance or both.

What can you expect after the injection?

Time will tell if the injection will help. You may start to feel some relief within 3 to 7 days. The combination of heat prior to exercise, ice after exercise and stretching exercises will assist in your recovery.