Which device is commonly used for fracture healing?

• A. Exogen
• B. Sonometer
• C. Diathermy unit
• D. Thermistor

Answer: (A)

Noninvasive ultrasound therapy to stimulate bone healing is the concept behind this question. Exogen is a low‑intensity pulsed ultrasound device used to accelerate fracture healing. It works by delivering ultrasound energy to the fracture site, which promotes cellular activity, increases blood flow, and stimulates callus formation. This can shorten healing time, especially in delayed unions or nonunions, and it is used in outpatient settings because it is noninvasive and has supportive clinical evidence.

The other options aren’t standard fracture-healing stimulators: a diathermy unit provides deep heating therapy rather than targeted fracture stimulation; a thermistor is simply a temperature sensor; a sonometer isn’t a device used to promote bone healing.