[Osteopathies that weaken HIV-infected patients].

OSTEOPOROSIS AND OSTEOPENIA: The use of multiple antiretroviral therapies has transformed the prognosis of HIV infection. However, the potential disadvantages of these treatments have rapidly appeared: lipodystrophy, cardiovascular complications and, more recently bone affections with osteonecrosis, followed by other weakening osteopathies (osteoporosis and osteopenia). Osteoporosis is a reduction in bone mineral density (BMD) leading to a high risk of fracture. It is measured by dual energy x-ray absorptiometry and is defined by a T-score<-2.5 standard deviations from the mean value of a young adult. Osteopenia corresponds to low bone density with, avec -1>T-score>-2.5. REGARDING THE AVAILABILITY OF RETROVIRAL AGENTS: During HIV infections, an osteopathy (most often osteopenia) is observed in a quarter to more than half of patients who have never received antiretroviral agents, and in up to three quarters in those in whom treatment in ongoing. The transversal nature of the majority of the studies, the heterogeneity of the treatments, the inclusion of both male and female patients in some studies, and the differences in the results observed do not permit one to draw any conclusions as to the possible responsibility of antiretroviral agents. An association between an osteopathy and a lipodystrophy is inconstant. Lastly, the substitution of a class of a antiretroviral agents by another does not lead to any significant modification in BMD. THE MECHANISM OF OCCURRENCE OF AN OSTEOPATHY: Has not been clearly established. The modifications in serum concentrations of biochemical markers of bone formation and resorption observed in HIV-infected patients and their evolution under antiretroviral treatment, suggest a viral origin, mediated by pro-inflammatory cytokines. The rare in vitro studies, or on animal models, are contradictory, with the results of clinical trials regarding the inherent role of antiretroviral drugs. However, it is probable that the classical risk factors for osteoporosis are often implied.