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.
Arthritis is the most common disease that affects bones in your knees. 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.
Start Here
Knee Problems(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/tools/symptom/542.printerview.html
What Are Knee Problems?(National Institute of Arthritis and Musculoskeletal and Skin Diseases) - http://www.niams.nih.gov/Health_Info/Knee_Problems/knee_problems_ff.asp
Also available in Spanish http://www.niams.nih.gov/Portal_En_Espanol/Informacion_de_Salud/Problemas_de_rodillas/default.asp
Overviews
Knee Pain(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/knee-pain/DS00555/DSECTION=all&METHOD=print
Questions and Answers about Knee Problems(National Institute of Arthritis and Musculoskeletal and Skin Diseases) - http://www.niams.nih.gov/Health_Info/Knee_Problems/default.asp
Latest News
Repair Anterior Cruciate Ligament (ACL) Injuries in Young Athletes Quickly(07/14/2009, HealthDay) - http://www.nlm.nih.gov/medlineplus/news/fullstory_86865.html
Diagnosis/Symptoms
Conventional Arthrography (Joint X-Ray)(American College of Radiology, Radiological Society of North America) - http://www.radiologyinfo.org/en/info.cfm?pg=arthrog&bhcp=1
Also available in Spanish http://www.radiologyinfo.org/sp/info.cfm?pg=arthrog
Knee Arthroscopy(Patient Education Institute) - http://www.nlm.nih.gov/medlineplus/tutorials/kneearthroscopy/htm/index.htm
Also available in Spanish http://www.nlm.nih.gov/medlineplus/spanish/tutorials/kneearthroscopyspanish/htm/index.htm
Knee Problems(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/tools/symptom/542.printerview.html
McMurray Test for Knee Injuries(InteliHealth) - http://www.intelihealth.com/IH/ihtPrint/WSIHW000/4464/8475/404134.html?d=dmtATD&hide=t&k=basePrint
MRI of the Musculoskeletal System(American College of Radiology, Radiological Society of North America) - http://www.radiologyinfo.org/en/info.cfm?pg=muscmr
Also available in Spanish http://www.radiologyinfo.org/sp/info.cfm?pg=muscmr
Ultrasound - Musculoskeletal(American College of Radiology, Radiological Society of North America) - http://www.radiologyinfo.org/en/info.cfm?pg=musculous
Also available in Spanish http://www.radiologyinfo.org/sp/info.cfm?pg=musculous
Treatment
Knee Implants(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00221
MedlinePlus: Knee Replacement(National Library of Medicine) - http://www.nlm.nih.gov/medlineplus/kneereplacement.html
Meniscal Transplant Surgery(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00381
Osteotomy and Unicompartmental Knee Arthroplasty(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00354
Surgical Treatment of Osteoarthritis of the Knee(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00385
Viscosupplementation Treatment for Arthritis(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00217
Prevention/Screening
Knee Bracing: What Works?(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/healthy/physical/injuries/490.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/healthy/physical/injuries/490.printerview.html
Knee Exercises(American Academy of Orthopaedic Surgeons) -
http://orthoinfo.aaos.org/topic.cfm?topic=A00564
Rehabilitation/Recovery
Knee Arthroscopy Exercise Guide(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00300
Also available in Spanish http://orthoinfo.aaos.org/topic.cfm?topic=A00478
MedlinePlus: Mobility Aids - Canes, crutches, walkers, wheelchairs - http://www.nlm.nih.gov/medlineplus/mobilityaids.html
Taking Care of Your Knees(American Physical Therapy Association) - Links to PDF - http://www.apta.org/AM/Images/APTAIMAGES/ContentImages/ptandbody/Knee/Knees.pdf
Specific Conditions
ACL Injury Guide(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/acl-injury/AC99999/PAGE=all&METHOD=print
Arthritis of the Knee(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00212
Also available in Spanish http://orthoinfo.aaos.org/topic.cfm?topic=A00465
Articular Cartilage Injuries(American Orthopaedic Society for Sports Medicine) - Links to PDF - http://www.sportsmed.org/secure/reveal/admin/uploads/documents/ST%20Articular%20Cartilage%2008.pdf
Baker's Cyst (Popliteal Cyst)(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/bakers-cyst/DS00448/DSECTION=all&METHOD=print
Chondromalacia Patella(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/chondromalacia-patella/DS00777/DSECTION=all&METHOD=print
Collateral Ligament Injuries(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00550
Combined Knee Ligament Injuries(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00551
Goosefoot (Pes Anserine) Bursitis of the Knee(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00335
Hyperextended Knee: How Is It Treated?(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/hyperextended-knee/AN00283/METHOD=print
Kneecap (Prepatellar) Bursitis(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00338
Meniscal Tears(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00358
Also available in Spanish http://orthoinfo.aaos.org/topic.cfm?topic=A00470
Osteoarthritis of the Knee(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/common/pain/disorders/616.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/common/pain/disorders/616.printerview.html
Osteoarthritis of the Knee: A Guide for Adults(Agency for Healthcare Research and Quality) - http://effectivehealthcare.ahrq.gov/healthInfo.cfm?infotype=sg&DocID=132&ProcessID=89
Osteoarthritis of the Knee: FAQs(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00228
Osteochondritis Dissecans(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/osteochondritis-dissecans/DS00741/METHOD=print&DSECTION=all
Osteochondritis Dissecans (OCD)(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/articles/488.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/articles/488.printerview.html
Osteonecrosis of the Knee(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00225
Patellar Instability (Unstable Kneecap)(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00350
Patellar Tendinitis(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/patellar-tendinitis/DS00625/DSECTION=all&METHOD=print
Patellofemoral Pain Syndrome(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/healthy/physical/injuries/479.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/healthy/physical/injuries/479.printerview.html
Pigmented Villonodular Synovitis (PVNS)(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/common/pain/disorders/469.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/common/pain/disorders/469.printerview.html
Posterior Cruciate Ligament (PCL) Tear(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00420
Posterior Cruciate Ligament Injury(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/posterior-cruciate-ligament/DS00928/DSECTION=all&METHOD=print
Runner's Knee (Patellofemoral Pain)(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00382
Torn Meniscus(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/torn-meniscus/DS00932/DSECTION=all&METHOD=print
Water on the Knee(Mayo Foundation for Medical Education and Research) - http://www.mayoclinic.com/print/water-on-the-knee/DS00662/DSECTION=all&METHOD=print
Related Issues
Anesthesia for Hip and Knee Surgery(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00372
JAMA Patient Page: Knee Pain(American Medical Association) - http://jama.ama-assn.org/cgi/reprint/297/15/1740.pdf
Also available in Spanish http://jama.ama-assn.org/cgi/data/297/15/1740/DC1/1
Health Check Tools
Knee Injury(DSHI Systems) - http://www.freemd.com/knee-injury/visit-virtual-doctor.htm
Knee Pain (DSHI Systems) - http://www.freemd.com/knee-pain-unilateral/visit-virtual-doctor.htm
Knee Stiffness (DSHI Systems) - http://www.freemd.com/knee-stiffness-unilateral/visit-virtual-doctor.htm
Tutorials
About Joint Arthroscopy(Arthritis Foundation) - http://ww2.arthritis.org/conditions/surgerycenter/surgerycenterflash/arthroscopy.html
Knee Arthroscopy(Patient Education Institute) - http://www.nlm.nih.gov/medlineplus/tutorials/kneearthroscopy/htm/index.htm
Also available in Spanish http://www.nlm.nih.gov/medlineplus/spanish/tutorials/kneearthroscopyspanish/htm/index.htm
Surgical Procedures: Hip, Knee, Shoulder(Arthritis Foundation) - http://www.arthritis.org/joint-surgery.php
Unicondylar Knee Resurfacing(Arthritis Foundation) - http://ww2.arthritis.org/conditions/surgerycenter/surgerycenterflash/uni.html
Videos
Anterior Cruciate Ligament (ACL) Reconstruction Surgery(OR-Live) - One hour program - 5/14/2007 - http://www.or-live.com/distributors/NLM/rnh.cfm?id=529
Arthroscopic Surgery to Replace a Young Athlete's ACL(OR-Live) - One hour program - 10/17/2006 - http://www.or-live.com/distributors/NLM/rnh.cfm?id=350
If I Had - A Popping Knee(Insidermedicine) - http://insidermedicine.com/archives/If_I_Had_-_A_Popping_Knee_-_Dr_Wiemi_Duouguih_MD_2787.aspx?p=mdlnp
Knee Pain and the Weekend Warriors(OR-Live) - One hour program - 3/17/2009 - http://www.or-live.com/distributors/NLM-Flash/meh_2261/rnh.cfm?id=858
Also available in Spanish http://www.or-live.com/distributors/NLM-Flash/meh_2703/rnh.cfm?id=867
Clinical Trials
ClinicalTrials.gov: Anterior Cruciate Ligament Injuries(National Institutes of Health) - http://clinicaltrials.gov/search/open/condition=%22 Anterior+Cruciate+Ligament%22
ClinicalTrials.gov: Articular Cartilage Disorders(National Institutes of Health) - http://clinicaltrials.gov/search/open/condition=%22 Cartilage,+Articular%22
ClinicalTrials.gov: Patella Disorders(National Institutes of Health) - http://clinicaltrials.gov/search/open/condition=%22 Patella%22
ClinicalTrials.gov: Knee Injuries(National Institutes of Health) - http://clinicaltrials.gov/search/open/term=knee+injuries
Questions & Answers - NIH Glucosamine/Chondroitin Arthritis Intervention Trial (GAIT)(National Center for Complementary and Alternative Medicine) -http://nccam.nih.gov/research/results/gait/qa.htm
Research
Alternative Warm-Up Program Reduces Risk of ACL Injuries for Female College Soccer Players(Centers for Disease Control and Prevention) -http://www.cdc.gov/media/pressrel/2008/r080725.htm
Knee Pain and Meniscus Tears—What's the Connection?(National Institute of Arthritis and Musculoskeletal and Skin Diseases) -http://www.niams.nih.gov/News_and_Events/Spotlight_on_Research/2009/meniscus_tears.asp
Lifetime Risk of Symptomatic Knee Osteoarthritis(Centers for Disease Control and Prevention) - http://www.cdc.gov/features/osteoarthritis/
Journal Articles
References and abstracts from MEDLINE/PubMed (National Library of Medicine)
Article: Range of motion and quadriceps muscle power after early surgical... - http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=pubmed&dopt=AbstractPlus&list_uids=19487506&tool=MedlinePlus
Article: How severe are initially undetected injuries to the knee accompanying... - http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=pubmed&dopt=AbstractPlus&list_uids=19430245&tool=MedlinePlus
Article: Knee ligament surgery. Age limits are changing. - http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=pubmed&dopt=AbstractPlus&list_uids=19400012&tool=MedlinePlus
Knee Injuries and Disorders -- see more articles - http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=search&db=pubmed&term=(knee+injuries[majr]+OR+patella/injuries[majr])+AND+english[la]+AND+humans[mh]+AND+(jsubsetk[text]+OR+jsubsetaim[text]+OR+jsubsetn[text]+OR+guideline[pt]+OR+clinical+trial[pt]+OR+patient+education+handout[pt])+NOT+(letter[pt]+OR+editorial[pt]+OR+case+reports[pt])&doptcmdl=summary&cmd_current=Limits&pmfilter_EDatLimit=last+1+Year&tool=MedlinePlus
Meniscal injuries -- see more articles - http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=search&db=pubmed&term=menisci,tibial/in[majr]+OR+menisci,tibial/su[majr]+AND+english[la]+AND+humans[mh]+NOT+(letter[pt]+OR+e! ditorial[pt]+OR+case+reports[pt])&doptcmdl=summary&cmd_current=Limits&pmfilter_EDatLimit=last+1+Year&tool=MedlinePlus
Dictionaries/Glossaries
Glossary of Orthopaedic Words(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/glossary.cfm
Directories
AAHKS Doctor Locator(American Association of Hip and Knee Surgeons) - http://www.aahks.org/patients/public/memdir.cfm
Find an Orthopaedist(American Academy of Orthopaedic Surgeons) - http://www6.aaos.org/about/public/members.cfm
Organizations
American Academy of Orthopaedic Surgeons - http://www.aaos.org/
National Institute of Arthritis and Musculoskeletal and Skin Diseases - http://www.niams.nih.gov/
Also available in Spanish http://www.niams.nih.gov/Portal_En_Espanol/
Statistics
Knee Osteoarthritis Statistics(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00399
MedlinePlus Magazine
Athlete's Nightmare: Tearing the ACL - http://www.nlm.nih.gov/medlineplus/magazine/issues/summer08/articles/summer08pg24-26.html
Children
Knock-Knees(Children's Hospital Boston) - http://www.childrenshospital.org/az/Site1103/mainpageS1103P0.html
Osgood-Schlatter Disease(Nemours Foundation) - http://kidshealth.org/kid/ill_injure/aches/osgood_schlatter.html
Teenagers
Adolescent Anterior Knee Pain(American Academy of Orthopaedic Surgeons) - http://orthoinfo.org/topic.cfm?topic=A00041
Knee Injuries(Nemours Foundation) - http://kidshealth.org/teen/safety/first_aid/knee_injuries.html
Osgood-Schlatter Disease(Nemours Foundation) - http://kidshealth.org/teen/food_fitness/sports/osgood.html
Osgood-Schlatter Disease: A Cause of Knee Pain in Children(American Academy of Family Physicians) - http://familydoctor.org/online/famdocen/home/children/parents/special/bone/135.printerview.html
Also available in Spanish http://familydoctor.org/online/famdoces/home/children/parents/special/bone/135.printerview.html
Seniors
Care of the Aging or Post-Traumatic Knee(American Academy of Orthopaedic Surgeons) - http://orthoinfo.aaos.org/topic.cfm?topic=A00344
You may also be interested in these MedlinePlus related pages:
Knee Replacement - http://www.nlm.nih.gov/medlineplus/kneereplacement.html
Leg Injuries and Disorders - http://www.nlm.nih.gov/medlineplus/leginjuriesanddisorders.html
Bones, Joints and Muscles - http://www.nlm.nih.gov/medlineplus/bonesjointsandmuscles.html
Injuries and Wounds - http://www.nlm.nih.gov/medlineplus/injuriesandwounds.html
Knee Injuries and Disorders - Multiple Languages - http://www.nlm.nih.gov/medlineplus/languages/kneei...
Date last updated: July 21 2009
Topic last reviewed: June 12 2009
From MedlinePlus (http://medlineplus.gov), 24 Hour Health Information.
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