Final answer:
To assess a rotator cuff injury, a physical exam including the Drop arm test and evaluation of shoulder weakness, pain, and decreased ROM is essential, with MRI being used for detailed imaging. The Phalen's test does not assess rotator cuff injuries.
Step-by-step explanation:
Assessing a rotator cuff injury can involve multiple approaches. The physical exam is crucial, where tests like the Drop arm test are performed to detect muscle weakness and inefficiency in the shoulder function. If the rotator cuff is suspected to be injured, this test can help identify issues with the muscles that compose the rotator cuff, such as the supraspinatus muscle. Additionally, the patient's shoulder weakness, pain, and decreased range of motion (ROM) are assessed, all of which are indicative of potential rotator cuff damage. For a more detailed assessment, imaging techniques like MRI can provide visual confirmation of the injury, showing inflammation, degeneration, or tears. The Phalen's test is typically used for carpal tunnel syndrome and does not assess the rotator cuff.