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Alterations in skeletal and mineral metabolism following thermal injuries.

Severe burns and other chronic inflammatory diseases are associated with altered skeletal metabolism that result in an increased incidence of osteopenia. In thermally injured children and adults there is a dramatic decrease in bone formation accompanied with an increase or maintenance of bone resorption. Children also exhibit a growth delay and subsequently fail to reach a predicted stature. Animal models, including the thermal injury mouse model, are being used to understand the mechanisms behind the uncoupling of bone formation and resorption that occurs following a major burn. The model has numerous commonalities with the human condition such as reduced bone formation, increased bone resorption, and decreased endochondral growth. The mechanisms that modulate calcium and skeletal metabolism following a thermal injury are complex and likely involve a number of endocrine, cytokine, and immune factors. Specifically, the potential roles of glucocorticoids, growth hormone, insulin-like growth factor-1, parathyroid hormone, interleukin-1 and -6, and tumor necrosis factor alpha are addressed. Subsequent to the increased survival rate of burn victims, there has been a heightened focus on therapeutic interventions that prevent or decrease the impact of thermal injuries on the skeletal system. These include exercise programs, exogenous recombinant human growth hormone, insulin, and oxandrolone.