Ultrasonography is an imaging technique used to diagnose a variety of conditions, as well as to guide biopsies and injections. The process uses high-frequency sound waves and directs them at specified areas of the body to generate images of the internal structure. It is most effective in imaging soft tissues that are solid or filled with fluid. The procedure is done by applying a gel over the surface of the skin and then running a transducer over the area. The use of Ultrasound in an Orthopaedic setting is painless. In our orthopaedic practice we use ultrasound predominantly to guide needle placement for injections and aspirations, in order to improve accuracy and the success of the procedure.