Athritis by PodcastDX, LLC published on 2018-05-15T06:45:40Z Episode 7 features a forum discussion on the 3 major types of arthritis. Osteoarthritis (OA), Rheumatoid Arthritis (RA) and Psoriatic Arthritis . As a follow up to last weeks episode on Sciatica and how osteoarthritis can be a contributing factor, we felt this would a good time to delve into more detail on the various types of arthritis.