Final answer:
Ultrasound can identify concussions, stress fractures, and ACL tears, but it is not the primary imaging modality for diagnosing these injuries.
Step-by-step explanation:
Ultrasound can identify various sports injuries, including a) Concussions, b) Stress fractures, and c) ACL tears. However, it is important to note that ultrasound is not the primary modality for diagnosing these injuries, but it can be used as a complementary tool to other imaging studies.
For example, in the case of concussions, ultrasound can be used to visualize the brain and detect any abnormalities, but more commonly used imaging studies such as CT scans or MRI are preferred for accurate diagnosis.
In the case of stress fractures and ACL tears, ultrasound can help identify the presence and location of the injury, but it may not provide as detailed information as other imaging studies like X-rays or MRI.