DYSBARIC OSTEONECROSIS PDF

Presentation[ edit ] The lesion begins as a localised area of infarction , usually without symptoms. Early identification of lesions by radiography is not possible, but over time areas of radiographic opacity develop in association with the damaged bone. Symptomatic lesions usually involve joint surfaces, and fracture where attempted healing occurs. This process takes place over months to years and eventually causes disabling arthritis , particularly of the femoral head hip.

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Presentation[ edit ] The lesion begins as a localised area of infarction , usually without symptoms. Early identification of lesions by radiography is not possible, but over time areas of radiographic opacity develop in association with the damaged bone. Symptomatic lesions usually involve joint surfaces, and fracture where attempted healing occurs. This process takes place over months to years and eventually causes disabling arthritis , particularly of the femoral head hip.

The initial damage is attributed to the formation of bubbles, and one episode can be sufficient, however incidence is sporadic and generally associated with relatively long periods of hyperbaric exposure and aetiology is uncertain. In juxta-articular lesions without symptoms , there is dead bone and marrow separated from living bone by a line of dense collagen. Microscopic cysts form, fill with necrotic material and there is massive necrosis with replacement by cancellous bone with collapse of the lesions.

Worsening of the condition from continued decompression in an asymptomatic x-ray finding may occur. By using the most conservative decompression schedule reasonably practicable, and by minimizing the number of major decompression exposures, the risk of DON may be reduced. Diving should be restricted to shallow depths.

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Dysbaric Osteonecrosis.

Tyler C. White1; Jeffrey S. Introduction Dysbaric osteonecrosis is a type of avascular necrosis of the bone most commonly found in undersea divers and workers breathing compressed air or gas. This condition can lead to increased risk of fracture depending on the location and size of the bony defect.

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