What possible complications are associated with polyarticular juvenile arthritis?

There are many different forms of Arthritis ranging from the wear and tear damage that can happen to joints of the body that you find with osteoarthritis. leading to the requirement of replacement joints pain killers special exercise regimes etc. to diseases like gout where a build up of crystals in the blood stream can destroy joints and organs such as the kidney. As well as the form that are autoimmune diseases that can affect a person of any age and lead to the destruction of joints and body organs ranging from the digestive system to the brain. the drugs that are used to treat these conditions also need to be monitored carefully as they themselves can be deadly as well. So one cans say without too much fear of contradiction that arthritis can lead to a variety of complication's.