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Health Dictionary

Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

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Knee pain

Introduction

Overview

Overview

Causes

Causes

Life Threatening Causes

Common Causes

Causes by Organ System

Cardiovascular Popliteal artery entrapment , Statins
Chemical/Poisoning Retinoids
Dental No underlying causes
Dermatologic Dermatomyositis, Erythema nodosum , Gout 
Drug Side Effect Anthrax vaccination, Fluoroquinolones, Statins, Systemic glucocorticoids, Tetanus vaccination
Ear Nose Throat Sjögren’s syndrome
Endocrine Primary hyperparathyroidism, Thyroid disease
Environmental No underlying causes
Gastroenterologic Hemochromatosis, Pancreas conditions 
Genetic Fairbank disease
Hematologic Acute leukemia, Bleeding disorders, Hemochromatosis, Hemoglobinopathies, Hemophilia, Leukemia, Popliteal artery aneurysm
Iatrogenic Clutton’s joints, Popliteal artery entrapment , Tetanus vaccination
Infectious Disease Baker’s cyst, Congenital syphilis, Disseminated gonococcal infection, Gonococcal pyarthrosis, Knee bacterial infection, Knee cyst, Knee infection, Neisseria gonorrhoeae, Pyarthrosis, Pyogenic infection, Syphilis, Viral infection, Yersiniosis 
Musculoskeletal/Orthopedic Anterior cruciate ligament tear, Articular cartilage injury, Baker’s cyst, Bone contusion, Bone tumors, Brodie knee , Bursitis, Chondromalacia patella, Crystal arthropathy, Degenerative medial meniscal tear , Dislocated knee, Dislocated patella, Epiphyseal dysplasia, Fairbank disease, Fallen arches , Femoral condyle fracture, Fibular head or neck fracture, Fractured patella, Fractured tibial plateau, Gait problems, Hemarthrosis, Hip conditions , Hip dislocation, Hip injury , Hip replacement , Hoffa disease, Housemaid’s knee, Howship-romberg sign, Hypertrophic pulmonary osteoarthropathy periostitis, Hypophosphatemic rickets, Iliotibial band syndrome, Intermittent hydrarthrosis, Intra-articular fracture, Jaffe-lichtenstein-sutro syndrome , Johansson-sinding-larsen syndrome, Joint injury , Juvenile chronic arthritis, Juvenile paget’s disease , Knee arthritis, Knee bacterial infection, Knee bursitis, Knee conditions, Knee cyst, Knee dislocation, Knee fracture, Knee infection, Knee inflammation, Knee injury , Knee overuse, Knee sprain , Knee strain, Knee tendinitis , Knee tumor, Knock knees, Lateral knee pain , Malignant bone tumor, Medial ligament injury, Medial ligament tear, Meniscal pathology, Meniscus injury , Meniscus tear, Neisseria gonorrhoeae, Neuropathic knee joint, Osgood-schlatter disease, Osteoarthritis, Osteochondritis dissecans, Osteochondrosis, Paget’s disease, Patella dislocation or significant subluxation, Patella fracture, Patella stress fracture, Patella subluxation, Patella tendon tear, Patellar tendinitis, Patellar tendinopathy, Patellofemoral pain, Pellegrini-stieda syndrome, Pes anserine bursitis, Polymyositis, Popliteus tendinopathy, Posterior cruciate ligament tear, Posterolateral corner injury, Prior knee injury, Pyarthrosis, Pyrophosphate arthropathy, Quadriceps tendon tear, Quadriceps tendinopathy, Referred knee pain, Reiter’s syndrome , Rickets, Seronegative spondyloarthropathy , Sinding larsen-johannson disease, Singh-williams-mcalister syndrome , Spondyloepiphyseal dysplasia tarda, Supracondylar femur fracture, Synovial chondromatosis, Synovitis, Talo-patello-scaphoid osteolysis, Tar syndrome , Torn ligament, Trochlear dysplasia , Upper tibia epiphysis , Weak ankles 
Neurologic Neuropathic knee joint, Popliteal artery aneurysm, Saphenous nerve entrapment , Sciatica
Nutritional/Metabolic Scurvy
Obstetric/Gynecologic No underlying causes
Oncologic Acute leukemia, Bone tumors, Knee tumor, Leukemia, Lipoma arborescens, Lyme disease – knee arthritis, Malignant bone tumor, Synovial chondromatosis, Synovioma
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary Sarcoidosis
Renal/Electrolyte No underlying causes
Rheumatology/Immunology/Allergy Ankylosing spondylitis , Arthritis , Bursitis, Crystal arthropathy, Dermatomyositis, Erythema nodosum , Gout , Gram’s syndrome , Hoffa disease, Hypertrophic pulmonary osteoarthropathy periostitis, Hypophosphatemic rickets, Iliotibial band syndrome, Intermittent hydrarthrosis, Juvenile rheumatoid arthritis, Knee arthritis, Knee bursitis, Knee inflammation, Knee tendinitis , Knock knees, Lipoarthritis, Lyme disease – knee arthritis, Osgood-schlatter disease, Osteoarthritis, Osteochondritis dissecans, Osteochondrosis, Paget’s disease, Patellar tendinopathy, Pes anserine bursitis, Pigmented villonodular synovitis, Plica syndrome, Polymyositis, Popliteal cyst, Popliteus tendinopathy, Pyrophosphate arthropathy, Reiter’s syndrome , Rheumatoid arthritis, Rickets, Sarcoidosis, Sciatica, Septic arthritis, Seronegative spondyloarthropathy , Spondyloepiphyseal dysplasia tarda, Still’s disease, Supracondylar femur fracture, Synovial plica syndrome, Synovitis, Systemic lupus erythematosus, Systemic sclerosis, Tar syndrome 
Sexual Congenital syphilis, Syphilis
Trauma Articular cartilage injury, Chondromalacia patella, Cruciate injury, Degenerative medial meniscal tear , Dislocated knee, Dislocated patella, Fallen arches , Femoral condyle fracture, Fibular head or neck fracture, Fractured patella, Fractured tibial plateau, Gait problems, Hip dislocation, Hip injury , Hip replacement , Howship-romberg sign, Intra-articular fracture, Jaffe-lichtenstein-sutro syndrome , Johansson-sinding-larsen syndrome, Joint injury , Juvenile chronic arthritis, Juvenile paget’s disease , Knee dislocation, Knee fracture, Knee injury , Knee overuse, Knee sprain , Knee strain, Lateral knee pain , Medial ligament injury, Medial ligament tear, Meniscal pathology, Meniscus injury , Meniscus tear, Patella dislocation or significant subluxation, Patella fracture, Patella stress fracture, Patella subluxation, Patella tendon tear, Patellar tendinitis, Patellofemoral pain, Posterior cruciate ligament tear, Posterolateral corner injury, Prior knee injury, Quadriceps tendon tear, Quadriceps tendinopathy, Referred knee pain, Synovial plica syndrome, Torn ligament, Trauma, Trochlear dysplasia , Upper tibia epiphysis , Weak ankles 
Urologic No underlying causes
Miscellaneous No underlying causes

Causes in Alphabetical Order

References

References

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.