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In page Child bone fracture:

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This fracture occurs at the metaphyseal locations and resemble the torus or base of a pillar in architectural terms. Acute angulation of the cortex is noted, as opposed to the usual curved surface. It is 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.[citation needed]