A high volume ultrasound guided injection is a procedure performed to treat a tendon injury that occurs as a result of severe strain being placed on the tendon. During the healing process following a tendon injury, tiny blood vessels grow into the tendon bringing with them new nerves as well. These nerves are responsible for the sensation of pain related to the tendon injury or tendinopathy. The procedure involves injecting a high volume of a solution of salt water (normal saline), small amount of steriod and a local anaesthetic into the space between the tendon sheath and tendon. The solution pushes the tendon sheath away from the tendon and strips off the new blood vessels and nerve endings that have grown into the tendon. The aim of high volume injections is to reduce pain and allow individuals to move and exercise the tendon comfortably.