DENSIDAD MINERAL ÓSEA DE RAQUIS Y CADERA, Y VARIABLES DE RESISTENCIA ÓSEA POR DXA

Abstract

Proximal femoral BMD predicts hip fracture risk (HFRx) by DXA. Elderly patients with a normal BMD may fracture. For choosing these individuals with HFRx, programs that improve femur analysis have been developed. These include: Hip axial length (HAL), indicates HFRx if it surpasses 120 mm. Cross-sectional moment of inertia (CSMI), cross-section area (CSA), femoral neck angle (theta). Upper neck (UP) There are programs that combine these variables with weight, height and age, and estimate the femoral risk. Our objectives were to measure BMD values and variables associated with HFRx in healthy middle-class women from Buenos Aires and to estimate correlations of these variables with weight, height and age. We evaluated 903 women, in cross-sectional, white race, older than 20 years of age, selected from a database of BMD among 2005-2006. BMD measurement was carried out with GE Lunar Prodigy version 8,6. Spine and unilateral femoral BMD (neck, trocanter, total femoral and UP), CSMI, CSA, HAL, theta, were explored. BMD values (g/cm2), HAL (mm), CSMI (mm4), CSA (mm2) and theta (degrees), were estimated by age decade. Each measurement is shown by its correspondent average and SD. Correlation existing between HAL with age, weight and height was investigated with the Pearson method. We found a positive HAL correlation with weight and height (rho= 0.28 and 0.58 respectively, p <0.0001) and not all with age. Spine and femoral BMD, in healthy women, progressively descends with age. Femoral neck BMD descends as from 50 years, while UP, from 40 years. Primary tension trabeculae responsible for bone resistance are in this region. These data correspond to the first study made to Argentine women with the new DXA technologies, but they do not represent all the population. We point out the small number of the youngest and oldest population.