Therapeutic ultrasound works by causing slight vibrations in the soft tissue which creates gas bubbles near the injury that expand and contract, a process called cavitation. This promotes healing by reducing swelling and inflammation due to injury. Therapeutic ultrasound can also be used to break down the buildup of scar tissue, also known as fibrosis. This helps promote soft tissue healing.
Electrical stimulating currents such as transcutaneous electrical nerve stimulation (TENS) and interferential current (IFC) utilize electrical energy, the flow of electrons or other charged particles from one area to another, causing depolarization of muscle or nervous tissue.
Interferential current (IFC) is commonly used for pain relief, to promote tissue healing, relieve muscle spasm and stimulate muscle.