Examples of<unk>  reactive bone in selected specimens of Triceratops A<unk>  can result from a large number of causes, including injury and chronic irritation due to a medical condition such as hypertrophic osteopathy, bone healing in response to fracture, chronic stress injuries, subperiosteal hematomas, osteomyelitis, and cancer of the bone. It may also occur as part of thyroid acropachy, a severe sign of the autoimmune thyroid disorder Graves' disease. Other causes include Menkes kinky hair syndrome and hypervitaminosis A. It can take about three weeks to appear.
Periosteal reaction
Bone erosion
Hypercementosis
Osteophyte
Heterotopic ossification
Bone decalcification
Capsular contracture
Condylar resorption