Osteoarthritis - Wikipedia, the free encyclopediaOsteoarthritis (OA) also known as degenerative arthritis or degenerative joint disease or osteoarthrosis, is a group of mechanical abnormalities involving degradation ...Osteoarthritis (Degenerative Arthritis) Causes, Diagnosis ...Osteoarthritis (OA or degenerative arthritis) is a joint disease caused by cartilage loss in a joint. Pain and stiffness are symptoms. Read about diagnosis and treatment.Osteoarthritis - MayoClinic.com - Mayo ClinicOsteoarthritis — Comprehensive overview covers symptoms, causes and treatment of osteoarthritis, including knee osteoarthritis.