.  After years of pushing your joints past their limits the joint may become hypremobile. If the joint is very mobile, the joint surfaces might wear out. If this happens, the body responds by laying down more bone. Although this sounds like the body healing itself, in reality , matters are made worse. Usually, the bone is not laid down smoothly and the joint surfaces become rough. The worst case thing that could happen is that the bone surfaces will become so rough that the bone will cause extreme swelling. This will cause the knuckle to become bigger than it's normal size.  If the swelling persists than this could lead to arthritis or joint diseases.