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About: Dysbaric osteonecrosis     Goto   Sponge   NotDistinct   Permalink

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Dysbaric osteonecrosis or DON is a form of avascular necrosis where there is death of a portion of the bone that is thought to be caused by nitrogen embolism (blockage of the blood vessels by a bubble of nitrogen coming out of solution) in divers. Although the definitive pathologic process is poorly understood, there are several hypotheses: * Intra- or extravascular nitrogen in bones, "nitrogen embolism". * Osmotic gas effects due to intramedullary pressure effects. * fat embolism * hemoconcentration and increased coagulability.