National Physical Therapy Examination (NPTE) Practice Exam

What modality is most effective in improving range of motion for a patient with hamstring strains?

1. Ultrasound

2. Iontophoresis

3. Short wave diathermy

4. TENS

The correct answer is: Short wave diathermy

The use of short wave diathermy is particularly effective for improving range of motion in patients with hamstring strains due to its ability to provide deep tissue heating. This modality works by delivering high-frequency electromagnetic waves that generate heat within the tissues, promoting increased blood flow, reducing muscle stiffness, and enhancing the extensibility of collagen in the muscles and surrounding soft tissues. The increase in tissue temperature can facilitate muscle relaxation and improve elasticity, making it easier for patients to engage in stretching and rehabilitation exercises. Therefore, this modality directly supports the goal of restoring range of motion, especially in the context of soft tissue injuries like hamstring strains. In contrast, while other modalities can serve other purposes, they do not specifically target the improvement of range of motion to the same degree as short wave diathermy. For example, ultrasound primarily focuses on promoting tissue healing and reducing pain without as significant an emphasis on deep heating. Iontophoresis is effective for delivering medication transdermally but does not contribute to mechanical flexibility. TENS (Transcutaneous Electrical Nerve Stimulation) is used primarily for pain management rather than directly improving range of motion. Thus, short wave diathermy stands out as the most appropriate choice for enhancing range of motion after