A chronic condition of bone characterized by disorder of the normal bone remodeling process. Normal bone has a balance of forces that act to lay down new bone and take up old bone. This relationship (referred to as “bone remodeling”) is essential for maintaining the normal calcium levels in our blood. In bone affected by Paget’s disease, the bone remodeling is disturbed and not synchronized. As a result, the bone that is formed is abnormal, enlarged, not as dense, brittle, and prone to breakage .