From the National Institutes of Health
Questions and Answers about Knee Problems (National Institute of Arthritis and Musculoskeletal and Skin Diseases) Overviews
Knee (American Academy of Orthopaedic Surgeons)

Anatomy/Physiology
Anatomy of the Knee (American Academy of Orthopaedic Surgeons)
Joints: How They Work (Mayo Foundation for Medical Education and Research)

Diagnosis/Symptoms
Arthrography (American College of Radiology, Radiological Society of North America)
Knee Arthroscopy (Patient Education Institute) - requires Flash plug-in Also available in: Spanish
Knee Problems (American Academy of Family Physicians)
MR Imaging (MRI)-Musculoskeletal (American College of Radiology, Radiological Society of North America)
Ultrasound-Musculoskeletal (American College of Radiology, Radiological Society of North America)

Treatment
ACL (Anterior Cruciate Ligament) Reconstruction (American Academy of Orthopaedic Surgeons) Also available in: Spanish
Arthroscopic Surgery (Arthritis Foundation) - requires shockwave plug-in
Cemented and Cementless Knee Replacement (American Academy of Orthopaedic Surgeons)
Injections (Mayo Foundation for Medical Education and Research)
Joint and Soft Tissue Injections (American Academy of Family Physicians)
Joint Replacement: An Inside Look (Food and Drug Administration)
Knee Implants (American Academy of Orthopaedic Surgeons)
Knee Replacement (Patient Education Institute) - requires Flash plug-in Also available in: Spanish
Meniscal Transplants (American Academy of Orthopaedic Surgeons)
New Techniques to Restore Articular Cartilage (American Academy of Orthopaedic Surgeons)
Osteoarthritis of the Knee: Hyaluronic Acid Injections (American Academy of Family Physicians)
Osteotomy and Unicompartmental Knee Arthroplasty (American Academy of Orthopaedic Surgeons)
Rotating Platform/Mobile-Bearing Knee Replacements (American Academy of Orthopaedic Surgeons)
Total Knee Replacement (American Academy of Orthopaedic Surgeons) Also available in: Spanish
Total Knee Replacement (Arthritis Foundation) - requires shockwave plug-in
Unicondylar Knee Resurfacing (Arthritis Foundation) - requires shockwave plug-in
Viscosupplementation Treatment for Arthritis (American Academy of Orthopaedic Surgeons)

Clinical Trials
ClinicalTrials.gov: Knee Injuries (National Library of Medicine)
ClinicalTrials.gov: Knee Replacement (National Library of Medicine)

Specific Conditions
Arthritis of the Knee (American Academy of Orthopaedic Surgeons) Also available in: Spanish
Baker's Cyst (Popliteal Cyst) (Mayo Foundation for Medical Education and Research)
Goosefoot (Pes Anserine) Bursitis of the Knee (American Academy of Orthopaedic Surgeons)
Hyperextended Knee (Mayo Foundation for Medical Education and Research)
JAMA Patient Page: Osteoarthritis of the Knee (American Medical Association)
Knee Injury (ACL) Health Decision Guide (Mayo Foundation for Medical Education and Research)
Knee Ligament Injuries (American Academy of Orthopaedic Surgeons)
Kneecap (Prepatellar) Bursitis (American Academy of Orthopaedic Surgeons)
Meniscal Tear (American Academy of Orthopaedic Surgeons) Also available in: Spanish
Meniscus Tear (Mayo Foundation for Medical Education and Research)
Osteochondritis Dissecans (OCD) (American Academy of Family Physicians)
Patellofemoral Pain Syndrome (American Academy of Family Physicians)
Pigmented Villonodular Synovitis (PVNS) (American Academy of Family Physicians)
Posterior Cruciate Ligament (PCL) Tear (American Academy of Orthopaedic Surgeons)
Unstable Kneecap (American Academy of Orthopaedic Surgeons)
Water on the Knee (Mayo Foundation for Medical Education and Research)

Prevention/Screening
Knee Bracing -- What Works? (American Academy of Family Physicians)
Taking Care of Your Knees (American Physical Therapy Association)

Rehabilitation
Activities After a Knee Replacement (American Academy of Orthopaedic Surgeons)
Exercises for Patients with Knee Osteoarthritis (McGraw-Hill Companies)
Knee Arthroscopy Exercise Guide (American Academy of Orthopaedic Surgeons) Also available in: Spanish
Knee Replacement - Physical Therapy (Patient Education Institute) - requires Flash plug-in Also available in: Spanish
Knee Replacement Exercise Guide (American Academy of Orthopaedic Surgeons) Also available in: Spanish

Related Issues
Anesthesia for Hip and Knee Surgery (American Academy of Orthopaedic Surgeons)

Research
Geographic Regions Influence Rates of Knee Replacement (National Institute of Arthritis and Musculoskeletal and Skin Diseases)
Team Care by Hospitalists with Surgeons after Hip or Knee Surgery (American College of Physicians)

Directories
AAHKS Doctor Locator (American Association of Hip and Knee Surgeons)
AOSSM Directory: Find a Doctor (American Orthopaedic Society for Sports Medicine)
Find an Orthopaedist (American Academy of Orthopaedic Surgeons)

Organizations
American Academy of Orthopaedic Surgeons
National Institute of Arthritis and Musculoskeletal and Skin Diseases Also available in: Spanish

Newsletters/Print Publications
Total Knee Replacement (National Library of Medicine)

Women
Orthopaedists Research Female Knee Problems (American Academy of Orthopaedic Surgeons)
Preventing ACL Injuries in Women (American Academy of Orthopaedic Surgeons)

Children
Osgood-Schlatter Disease (Knee Pain) (American Academy of Orthopaedic Surgeons)

Teenagers
Adolescent Anterior Knee Pain (American Academy of Orthopaedic Surgeons)