Knee Guru - Information on knee problems, discussion board and list of clinics. The Patellofemoral Foundation - Organization for research and education. BigKneePain.com - Common causes, prevention and treatments. WebMD - Find information on Anterior Cruciate Ligament (ACL) injuries. NHS Choices: Knee Replacement - Provides an animation showing knee replacement surgery, and information on when and why it is done, how the procedure is performed, risks and recovery. NHS Choices: Knock Knee - Provides information on this disorder where there is a large distance between the ankles when the knees are touching. Includes details of symptoms, causes, diagnosis and treatment. Knee Surgery - Provides information on injuries to the anterior cruciate ligament . Includes a short video and details of why surgery may be necesary, how the procedure is performed, risks, results and recovery. Baker's Cyst - Provides information on this fluid-filled swelling that develops at the back of the knee. Includes details of symptoms, causes, diagnosis, treatment and complications. Knee Dislocation - Information on the causes, symptoms, and treatment of knee dislocation from eMedicine. Knee Pain - Information on common problems and their treatment.