Which heat modality is contraindicated in children due to the potential for premature growth plate closure?

Which heat modality is contraindicated in children due to the potential for premature growth plate closure?

• A. Microwave therapy
• B. Infrared therapy
• C. Ultrasound
• D. Cryotherapy

Answer: (C)

In children, growth plates (physes) are the areas where bone lengthening occurs, so they are especially sensitive to heat and temperature changes. Therapeutic ultrasound delivers energy that can produce deeper, more focused heating in tissues, including near joints where growth plates reside. Excess heating of a growth plate can interfere with chondrocyte activity and normal bone growth, potentially causing premature closure or growth disturbances. Because of this risk, ultrasound is contraindicated directly over growth plates in pediatric patients.

Infrared therapy produces more superficial heat, affecting mainly skin and subcutaneous tissues, so it’s less likely to impact the growth plate. Cryotherapy is not a heat modality, so it doesn’t carry the same risk regarding growth plate closure. Microwave therapy also involves heating, but the concern here is most strongly tied to the depth and focal heating ultrasound provides near the physes.