Stage 4 Pressure Sore
The wound extends into the muscle and can extend as far down as the bone. Usually lots of dead tissue and drainage are present. There is a high possibility of infection.
Photo source: The Merck Manual of Geriatrics, 3rd Edition, edited by Mark H. Beers, and Robert Berkow. Copyright 2000 by Merck & Co., Inc., Whitehouse Station, NJ. Available at: http://www.merck.com/mkgr/mmg/home.jsp. Accessed 7/21/09. Image provided by Oscar Alvarez, MD. Used with permission.