Low bone mass and osteoporosis are underdiagnosed in childhood in our environment and its prevalence is unknown. In most cases they are secondary to chronic diseases that conduct to a poor bone health condition and thereby a risk of fracture increased. The aim of this study is to identify patients with risk factors for low bone mass and determine their Bone Mineral Density (amount of bone) by performing bone densitometry and compared with healthy population of the same characteristics. Also the investigators want to evaluate bone quality by application of Trabecular Bone Score to images obtained by densitometry. As secondary objectives the investigators intend to correlate the data with with clinical variables to identify the most important in bone health clinical factors. In addition to measuring bone quality and quantity demographic and clinical process related to bone quality base and variables will be collected.