Final answer:
The position to place a patient with low back pain for ultrasound is lying down on their stomach or back. Ultrasound diathermy is used in physical therapy to relieve pain and improve flexibility.
Step-by-step explanation:
The position to place a patient with low back pain for ultrasound is typically lying down on their stomach or back. The therapist will apply the ultrasound probe to the affected area, such as the lower back, and move it around to target the muscles and tissues causing the pain. Ultrasound diathermy is often used in physical therapy to relieve pain and improve flexibility in injured or overworked muscles.