Emergency department evaluation and treatment of knee and leg injuries.

The knee is one of the most commonly injured joints in the human body, and, largely because of athletic injuries, they are increasing in frequency in the United States. This article provides a brief overview of knee anatomy, examines radiographic imaging techniques and arthrocentesis of the knee, and discusses injuries specific to the knee. An overview of leg anatomy is also presented, along with discussions of specific fractures common to the leg.