- Health-care professionals diagnose elbow pain mainly by a patient's history and physical exam. Radiologic techniques such as X-ray ,US,CT and MRI are often used to delineate the elbow structures involved. Conventional radiography remains an essential initial test in the evaluation of the elbow and its disorders. One must be familiar with the pertinent anatomy, early developmental changes, and the biomechanics of this complex joint to appreciate subtle injury patterns and articular disorders. In some cases, radiographic imaging will point to the need for further evaluation with CT, MR, or sonographic imaging High-resolution ultrasound is well suited for evaluating the elbow. Ultrasound is growing in popularity and fast becoming another modality that the radiologist can use to help diagnose elbow pathology. ultrasound offers focused and real-time high-resolution imaging of tendons, ligaments, and nerve structures. Its advantages include the use of safe nonionizing radiation, accessibility, and cost effectiveness. Ultrasound is also useful in therapeutic guided injections for its multiplanar capability and clear visualization of major vessels and nerves.