title: The painful knee.
mesh_terms: D000293:Adolescent; D001168:Arthritis / Q000150:complications / Q000601:surgery; D002648:Child; D006801:Humans; D007592:Joint Diseases / Q000150:complications; D007717:Knee; D007718:Knee Injuries / Q000150:complications; D008023:Ligaments, Articular / Q000293:injuries; D008875:Middle Aged; D010003:Osteoarthritis / Q000150:complications; D010007:Osteochondritis / Q000150:complications; D010146:Pain / Q000209:etiology*; D010329:Patella; D013577:Syndrome; D013585:Synovitis / Q000150:complications