Physical Therapy Assistant Practice Exam

In which scenario would the use of cushion contact for ultrasound application be MOST appropriate?

1. Healing soft tissue injuries

2. Even and flat tissue surfaces

3. Irregular shaped or bony areas

4. General pain relief

The correct answer is: Irregular shaped or bony areas

The use of cushion contact for ultrasound application is most appropriate in scenarios involving irregular shaped or bony areas due to the unique properties of ultrasound transmission. When ultrasound waves are directed over irregular surfaces or areas with significant contour changes, a cushion helps create a more uniform interface between the transducer and the skin, enhancing the transmission of sound waves. This is crucial because irregularities can lead to air pockets, which can disrupt the ultrasound waves and diminish their effectiveness. For instance, when working with areas like the shoulder or knee, where bony prominences and variations in soft tissue are common, the cushion ensures that the ultrasound energy can penetrate effectively and reach the targeted tissues. The cushion also serves to protect sensitive tissues from the pressure of the transducer, aiding in comfort for the patient during the treatment. In contrast, the other scenarios might not require cushion contact as specifically. For healing soft tissue injuries, even and flat tissue surfaces, and general pain relief can often be adequately treated with a direct application without the need for a cushion, as these situations typically do not involve the same risk of uneven transmission. Thus, using cushion contact in irregularly shaped or bony regions maximizes the therapeutic benefits of the ultrasound treatment.