title: Nonunion.
abstract: Nonunion can be classified into hypertrophic and atrophic types solely on radiographic appearance. The etiology of the former is uncontrolled motion at the fracture site and of the latter is devitalization of bone at the fracture site. The orthopedic management of each type differs markedly. Early diagnosis and proper orthopedic management of nonunion are predicated on proper interpretation of the radiographs. The radiographic appearance of each type is discussed and the pathophysiology is explained.
mesh_terms: D001284:Atrophy; D002146:Bony Callus / Q000000981:diagnostic imaging; D005599:Fractures, Ununited / Q000145:classification / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D011859:Radiography; D014945:Wound Healing