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Knee Injuries and Disorders
Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.
Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair and walking. This can have a big impact on your life.
The most common disease affecting the knee is osteoarthritis. The cartilage in the knee gradually wears away, causing pain and swelling.
Injuries to ligaments and tendons also cause knee problems. A common injury is to the anterior cruciate ligament (ACL). You usually injure your ACL by a sudden twisting motion. ACL and other knee injuries are common sports injuries.
Treatment of knee problems depends on the cause. In some cases your doctor may recommend knee replacement.
Knee problems are very common, and they occur in people of all ages. Knee problems can interfere with many things, from participation in sports to simply getting up from a chair and walking. This can have a big impact on your life.
The most common disease affecting the knee is osteoarthritis. The cartilage in the knee gradually wears away, causing pain and swelling.
Injuries to ligaments and tendons also cause knee problems. A common injury is to the anterior cruciate ligament (ACL). You usually injure your ACL by a sudden twisting motion. ACL and other knee injuries are common sports injuries.
Treatment of knee problems depends on the cause. In some cases your doctor may recommend knee replacement.
NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases
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Start Here
- Knee Problems(American Academy of Family Physicians)
- Also available in Spanish
- What Are Knee Problems?(National Institute of Arthritis and Musculoskeletal and Skin Diseases)
- Also available in Spanish
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Overviews
- Common Knee Injuries(American Academy of Orthopaedic Surgeons)
- Knee Problems(National Institute of Arthritis and Musculoskeletal and Skin Diseases)
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Latest News
- Treating 'Wear and Tear' Arthritis(09/25/2013, HealthDay)
- Weight Loss Tied to Knee Arthritis Benefits(09/24/2013, Reuters Health)
- Insoles Provide Little Arthritis Pain Relief(08/20/2013, Reuters Health)
- Knee Shape May Predict Who'll Benefit from ACL Surgery, Study Says(07/19/2013, HealthDay)
- More News on Knee Injuries and Disorders
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Diagnosis/Symptoms
- Arthrography(American College of Radiology, Radiological Society of North America)
- Also available in Spanish
- Knee Arthroscopy(Patient Education Institute)
- Also available in Spanish
- Knee MRI(American College of Radiology, Radiological Society of North America)
- Also available in Spanish
- Knee Pain(Mayo Foundation for Medical Education and Research)
- Knee Problems(American Academy of Family Physicians)
- Also available in Spanish
- MRI of the Musculoskeletal System(American College of Radiology, Radiological Society of North America)
- Also available in Spanish
- Musculoskeletal Ultrasound(American College of Radiology, Radiological Society of North America)
- Also available in Spanish
- Water on the Knee(Mayo Foundation for Medical Education and Research)
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Treatment
- ACL Injury: Does It Require Surgery?(American Academy of Orthopaedic Surgeons)
- ACL Reconstruction(Mayo Foundation for Medical Education and Research)
- Articular Cartilage Restoration(American Academy of Orthopaedic Surgeons)
- Knee Arthroscopy(American Academy of Orthopaedic Surgeons)
- MedlinePlus: Knee Replacement(National Library of Medicine)
- Also available in Spanish
- Meniscal Transplant Surgery(American Academy of Orthopaedic Surgeons)
- Osteotomy of the Knee(American Academy of Orthopaedic Surgeons)
- Treating Osteoarthritis of the Knee(American Academy of Family Physicians)
- Also available in Spanish
- Viscosupplementation Treatment for Arthritis(American Academy of Orthopaedic Surgeons)
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Prevention/Screening
- Anterior Cruciate Ligament (ACL) Injury Prevention(American Orthopaedic Society for Sports Medicine) - PDF
- Knee Exercises(American Academy of Orthopaedic Surgeons)
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Rehabilitation/Recovery
- Knee Arthroscopy Exercise Guide(American Academy of Orthopaedic Surgeons)
- Also available in Spanish
- Knee Bracing: What Works?(American Academy of Family Physicians)
- Also available in Spanish
- Knee Conditioning Program(American Academy of Orthopaedic Surgeons) - PDF
- MedlinePlus: Mobility Aids - Canes, crutches, walkers, wheelchairs
- Also available in Spanish
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Specific Conditions
- Anterior Cruciate Ligament (ACL) Injuries(American Academy of Orthopaedic Surgeons)
- Arthritis of the Knee(American Academy of Orthopaedic Surgeons)
- Also available in Spanish
- Articular Cartilage Injuries(American Orthopaedic Society for Sports Medicine) - PDF
- Baker's Cyst(Mayo Foundation for Medical Education and Research)
- Chondromalacia Patella(Mayo Foundation for Medical Education and Research)
- Collateral Ligament Injuries(American Academy of Orthopaedic Surgeons)
- Combined Knee Ligament Injuries(American Academy of Orthopaedic Surgeons)
- Discoid Meniscus(American Academy of Orthopaedic Surgeons)
- Distal Femur (Thighbone) Fractures of the Knee(American Academy of Orthopaedic Surgeons)
- Hyperextended Knee: Cause of Serious Injury?(Mayo Foundation for Medical Education and Research)
- Knee Tendon Bursitis(American Academy of Orthopaedic Surgeons)
- Meniscal Tears(American Academy of Orthopaedic Surgeons)
- Also available in Spanish
- Osteochondritis Dissecans (OCD)(American Academy of Family Physicians)
- Also available in Spanish
- Osteonecrosis of the Knee(American Academy of Orthopaedic Surgeons)
- Patellar (Kneecap) Fractures(American Academy of Orthopaedic Surgeons)
- Patellar Tendinitis(Mayo Foundation for Medical Education and Research)
- Patellar Tendon Tear(American Academy of Orthopaedic Surgeons)
- Patellofemoral Pain Syndrome(American Academy of Family Physicians)
- Also available in Spanish
- Pigmented Villonodular Synovitis (PVNS)(American Academy of Family Physicians)
- Also available in Spanish
- Posterior Cruciate Ligament Injuries(American Academy of Orthopaedic Surgeons)
- Prepatellar (Kneecap) Bursitis(American Academy of Orthopaedic Surgeons)
- Quadriceps Tendon Tear(American Academy of Orthopaedic Surgeons)
- Runner's Knee (Patellofemoral Pain)(American Academy of Orthopaedic Surgeons)
- Torn Meniscus(Mayo Foundation for Medical Education and Research)
- Unstable Kneecap(American Academy of Orthopaedic Surgeons)
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Related Issues
- Anesthesia for Hip and Knee Surgery(American Academy of Orthopaedic Surgeons)
- Office Visit Tips(American Association of Hip and Knee Surgeons)
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Pictures & Photographs
- Anterior cruciate ligament repair - slideshow
- Also available in Spanish
- Knee arthroscopy - slideshow
- Also available in Spanish
- Tibial osteotomy - slideshow
- Also available in Spanish
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Health Check Tools
- Knee Injury(DSHI Systems)
- Knee Pain(DSHI Systems)
- Knee Stiffness(DSHI Systems)
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Tutorials
- Anterior Cruciate Ligament Reconstruction Learning Module(American Academy of Orthopaedic Surgeons)
- Knee Arthroscopy(Patient Education Institute)
- Also available in Spanish
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Videos
- ACL Repair(OR-Live) - Baptist Health South Florida, Miami, FL, 9/16/2009
- Arthroscopic Surgery to Replace a Young Athlete's ACL(OR-Live) - Akron Children's Hospital, Akron, OH, 10/17/2006
- If I Had - A Popping Knee(Insidermedicine)
- Knee Arthroscopy for Treatment of a Meniscus Tear(OR-Live) - Broward Health Medical Center, Fort Lauderdale, FL, 11/04/2011
- Knee Pain and the Weekend Warriors(OR-Live) - Mercy Hospital, Miami, FL, 3/17/2009
- Also available in Spanish
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Clinical Trials
- ClinicalTrials.gov: Anterior Cruciate Ligament Injuries(National Institutes of Health)
- ClinicalTrials.gov: Anterior Cruciate Ligament Reconstruction(National Institutes of Health)
- ClinicalTrials.gov: Articular Cartilage Disorders(National Institutes of Health)
- ClinicalTrials.gov: Menisci, Tibial(National Institutes of Health)
- ClinicalTrials.gov: Patella Disorders(National Institutes of Health)
- ClinicalTrials.gov: Knee Injuries(National Institutes of Health)
- Questions & Answers - NIH Glucosamine/Chondroitin Arthritis Intervention Trial (GAIT)(National Center for Complementary and Alternative Medicine)
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Research
- Autograft or Allograft for ACL Reconstruction?(American Academy of Orthopaedic Surgeons)
- Geometry, Not Gender: Study Shows Why Women, and Some Men, Are at Greater Risk for ACL Injuries(American Academy of Orthopaedic Surgeons)
- Physical Therapy to Treat Torn Meniscus Comparable to Surgery for Many Patients(National Institute of Arthritis and Musculoskeletal and Skin Diseases)
- Study Determines Optimal Dose of Massage for Osteoarthritis of the Knee Pain Research(National Center for Complementary and Alternative Medicine)
- Trends in Knee Pain and Knee Osteoarthritis(American College of Physicians) - PDF
- Viscosupplementation for Knee Osteoarthritis(American College of Physicians) - PDF
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Journal Articles
References and abstracts from MEDLINE/PubMed (National Library of Medicine)- Article: Ask the doctors. I have had high blood pressure for...
- Article: Meniscus tears. Avoiding knee pain.
- Article: Incidence of graft rupture 15 years after bilateral anterior cruciate...
- Article: Examining the knee joint.
- Knee Injuries and Disorders -- see more articles
- Meniscal injuries -- see more articles
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Dictionaries/Glossaries
- Glossary of Orthopaedic Words(American Academy of Orthopaedic Surgeons)
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Directories
- AAHKS Doctor Locator(American Association of Hip and Knee Surgeons)
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Organizations
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MedlinePlus Magazine
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Children
- Osgood-Schlatter Disease(Nemours Foundation)
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Teenagers
- Adolescent Anterior Knee Pain(American Academy of Orthopaedic Surgeons)
- Also available in Spanish
- Knee Injuries(Nemours Foundation)
- Osgood-Schlatter Disease(American Academy of Family Physicians)
- Also available in Spanish
- Osgood-Schlatter Disease(Nemours Foundation)
- Runner's Knee(Nemours Foundation)
- Also available in Spanish
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Patient Handouts
- ACL reconstruction
- Also available in Spanish
- ACL reconstruction - discharge
- Also available in Spanish
- Anterior crucate ligament (ACL) injury
- Also available in Spanish
- Baker's cyst
- Also available in Spanish
- Broken kneecap - aftercare
- Also available in Spanish
- Chondromalacia patella
- Getting your home ready - knee or hip surgery
- Also available in Spanish
- Knee arthroscopy
- Also available in Spanish
- Knee arthroscopy - discharge
- Also available in Spanish
- Knee CT scan
- Also available in Spanish
- Knee microfracture surgery
- Also available in Spanish
- Knee MRI scan
- Also available in Spanish
- Knee pain
- Also available in Spanish
- Kneecap dislocation - aftercare
- Also available in Spanish
- Lateral collateral ligament (LCL) injury
- Also available in Spanish
- Medial collateral ligament (MCL) injury of the knee
- Also available in Spanish
- Meniscal allograft transplantation
- Also available in Spanish
- Meniscus tears
- Also available in Spanish
- Osgood-Schlatter disease
- Also available in Spanish
- Osteotomy of the knee
- Also available in Spanish
- Posterior cruciate ligament (PCL) injury
- Also available in Spanish
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