Musculoskeletal (MSK) ultrasound uses high-frequency linear transducers to image tendons, muscles, ligaments, peripheral nerves, bursae, and joint spaces in real time. Dynamic assessment — imaging while the patient moves the body part — is a unique advantage over MRI. Common applications include rotator cuff evaluation, Achilles tendon assessment, plantar fascia imaging, carpal tunnel evaluation, and joint effusion detection. MSK ultrasound is also widely used for guided injections and aspirations. The RMSKS credential offered by ARDMS recognizes specialized competency in this area.