All injections performed POSMI can be performed under ultrasound guidance. Ultrasound guided percutaneous procedures have several advantages. The primary advantages are the real-time assessment and guidance, in which continuous visualization of a needle is possible throughout the procedure. Ultrasound guidance assures exact placement of the drugs being injected into the affected body part. Recent peer-reviewed studies have found that blind injections are not as accurate in delivering medication as once thought. Utilizing ultrasound guidance for these injections assures pinpoint accuracy of the needle into the joint spaces, muscle tendon sheets and pathologic tissue.