Final answer:
High-intensity ultrasound, also known as kilohertz ultrasound, should not be used on wounds with broken skin due to the risk of tissue damage and overheating.
Step-by-step explanation:
High-intensity ultrasound, also known as kilohertz ultrasound, is contraindicated in wounds that are open or have broken skin. This is because the energy carried by high-intensity ultrasound is converted to thermal energy, which can cause overheating and tissue damage. Ultrasound diathermy, which uses intensities of 10³ to 104 W/m² and frequencies of 0.8 to 1 MHz, is commonly used for deep-heat treatments in physical therapy. However, in the case of open wounds, skill is needed to avoid further tissue damage caused by the ultrasound.