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A greenstick fracture is a fracture in a young, soft bone in which the bone bends and breaks. Despite the name fracture, during the majority of cases the bone is broken and hard to find in x-rays. This is owing in large part to the thick fibrous periosteum of immature bone. A person's bones become harder (calcified) and more brittle with age and the periosteum becomes thinner and less restrictive. Greenstick fractures usually occur most often during infancy and childhood when bones are soft. The name is by analogy with green (i.e., fresh) wood which similarly breaks on the outside when bent. It was discovered by British-American orthopedist, John Insall, and Polish-American orthopedist, Michael Slupecki. ==Classification of pediatric fractures== Pediatric fractures can be classified as complete and incomplete: * Incomplete: there are three basic forms of incomplete fractures: * * The first is the greenstick fracture, a transverse fracture of the cortex which extends into the midportion of the bone and becomes oriented along the longitudinal axis of the bone without disrupting the opposite cortex. * * The second form is a torus or buckling fracture, caused by impaction. They are usually the result of a force acting on the longitudinal axis of the bone: they are typically a consequence of a fall on an outstretched arm, so they mainly involve the distal radial metaphysis. The word torus is derived from the Latin word 'torus,' meaning swelling or protuberance. * * The third is a bow fracture in which the bone becomes curved along its longitudinal axis. * Complete fractures There are also physeal fractures (fractures involving the physis, the growth plate, which is not present in adults). The Salter-Harris classification is the most used to describe these fractures. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「greenstick fracture」の詳細全文を読む スポンサード リンク
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