Phonophoresis is a technique primarily used for what purpose?

Phonophoresis is a therapeutic technique that involves the use of ultrasound waves to enhance the delivery of medications through the skin. The primary purpose of phonophoresis is to drive a steroid compound or other therapeutic agents into the tissues for localized treatment of inflammatory conditions. This method allows for a more targeted approach to delivering medications, often resulting in reduced inflammation and pain management effectively.

In the context of the options provided, the choice highlighting the use of ultrasound to facilitate the penetration of a steroid compound into the skin accurately describes the fundamental function of phonophoresis. It's important to understand that while other options mention relevant concepts in therapeutic practices, they do not capture the specific mechanism and aim of phonophoresis as a technique tailored for medication delivery via the skin's absorption.