What Is Grade 4 Arthritis?

By Staff WriterLast Updated Apr 1, 2020 5:13:25 PM ET
PhotoAlto/Frederic Cirou/PhotoAlto Agency RF Collections/Getty Images

Grade 4 arthritis is categorized as osteoarthritis, or OA, whichis a joint disease that affects thecartilage that allows bone joints to function easily. Grade 4 osteoarthritis is categorized as the most severe level of the disease causing particular difficulty when walking, according to the Steadman Clinic.