BigKneePain.com: Common causes, prevention and treatments.
Bob's ACL Board: Personal page that discusses author's anterior cruciate ligament injury and reconstructive surgery. Features a discussion forum and a knee library.
Knee Dislocation: Information on the causes, symptoms, and treatment of knee dislocation from eMedicine.
Knee Guru: Information on knee problems, discussion board and list of clinics.
Knee Pain: Information on common problems and their treatment.
The Patellofemoral Foundation: Organization for research and education.