The use of ultrasound has drastically improved the safety and efficacy of injection therapy for the treatment of a broad range of conditions. But that is only the tip of the iceberg. A well-trained and experienced user can differentiate between normal and abnormal nerve, blood vessel, bone, ligament, tendons, bursae, and other soft tissue. This is key in making the correct diagnosis. For example, when trying to determine whether shoulder pain is coming from the rotator cuff which is outside the joint, or from arthritis which is inside the joint, ultrasound can be used to investigate both of these structures for signs of injury and inflammation. It can then be used to guide a needle to exact area that needs treatment. Ultrasound has major advantages over other imaging modalities such as Xrays and MRIs- no radiation, no loud noise, no confined spaces, and perhaps most importantly, you can pay attention to the screen and learn about your body.