Injection of the Piriformis Muscle by Fluoroscopic and Electromyographic Guidance

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Abstract

Background:

There is not a universally accepted single technique for injection of the piriformis muscle that has validated exact placement of the needle tip within the piriformis muscle.

Objective:

We sought a methodology that would precisely document needle placement within the piriformis muscle that is reliable, relatively uncomplicated, and reproducible.

Methods:

Patients with piriformis syndrome underwent injections of the piriformis muscle under fluoroscopic and electromyographic guidance. This technique used electrophysiological confirmation of needle placement within the piriformis muscle and image-guided identification of the piriformis muscle with radiopaque contrast media under fluoroscopy.

Results:

Using this methodology, injections on 17 occasions in 11 patients resulted in needle placement within the piriformis muscle.

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