Osteoarthritis of the knee.
D000367:Age Factors; D000368:Aged; D002358:Cartilage, Articular / Q000473:pathology; D005260:Female; D006801:Humans; D007717:Knee / Q000033:anatomy & histology / Q000473:pathology / Q000601:surgery; D007719:Knee Joint; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery*; D010027:Osteotomy