Which statement is a valid indication for ultrasound?

• A. Bone healing
• B. Pregnancy
• C. Eyes
• D. Unstable fractures

Answer: (A)

Therapeutic ultrasound, specifically low‑intensity pulsed ultrasound, is known to stimulate bone healing at fracture sites. The energy promotes osteogenic activity, improves microvascular flow, and stimulates callus formation, which can accelerate healing in certain acute fractures and nonunions. Because of this osteogenic effect, bone healing is a valid indication for ultrasound therapy when using a LIPUS device. The other options aren’t used as indications for therapeutic ultrasound: pregnancy and eyes involve tissues that are highly sensitive or pose safety concerns, so ultrasound therapy is avoided there; unstable fractures require stabilization and immobilization rather than energy delivery to the fracture site.