Idiopathic pulmonary fibrosis a rare disease with severe bone fragility

Idiopathic pulmonary fibrosis (IPF) is a rare form of chronic, progressive fibrosing interstitial pneumonia of unknown cause. The aim of this cross-sectional study was to assess the prevalence of osteoporosis and fragility fracture in a population of adults with IPF and to identify whether any possible clinical and pulmonary function parameters may be associated with increased bone fragility. In 58 IPF patients (mean age 65.1 ± 9.1 years), we measured bone mineral density (BMD) of the lumbar spine, the femoral neck, and the entire hip. Moreover, the presence of vertebral fractures on a lateral chest X-ray study was evaluated, and a vertebral fracture burden was quantified using the spinal deformity index (SDI). As expected, osteoporosis was significantly more frequent in females with respect to males (57.9 vs 20.5 %, respectively), whereas the fractures prevailed in males with respect to females (38.5 vs 26.3 %, respectively). There were positive correlations between BMD at all skeletal sites and respiratory parameters; in particular for FVC % and DLCO % with BMD at femoral sub-regions. Moreover, we compared the average of DLCO (%) measure by values of SDI score that was higher in those patients with lower values of DLCO (%). The study shows a high prevalence of fragility with vertebral fractures in IPF patients, especially in males. Moreover, the vertebral fracture burden is associated with a worsening of FVC (%) and DLCO (%). Therefore, an evaluation of bone status is recommended, especially in those patients who are candidates for lung transplantation.