<unk>  <unk> , is an extremely rare disease of the connective tissue. A mutation of the body's repair mechanism causes fibrous tissue (including muscle, tendon, and ligament) to be ossified when damaged. In many cases, injuries can cause joints to become permanently frozen in place. The growths cannot be removed with surgery because such removal causes the body to "repair" the area of surgery with more bone.
Fibrodysplasia ossificans progressiva
Myositis ossificans
Hypertrichotic osteochondrodysplasia
Geroderma osteodysplastica
Osteopetrosis
Aneurysmal bone cyst
Diffuse idiopathic skeletal hyperostosis
Giant cell tumor of bone