The focus of Dr Lang's Research is focused on development and application of quantitative analytic methods centered on bettering our understanding of two major chronic problems that affect the growing elderly population: osteoporosis, a main cause of age-related fractures, and sarcopenia, a loss of skeletal muscle strength, endurance and function. The aim of this research is to characterize skeletal density, geometry and indices of strength from volumetric CT scans of the hip and spine, as well as similar imaging based methods to quantify skeletal muscle anatomy and function. With the growth of his research group, Dr. Lang and his group have carried out a robust program in methods development, integrating density and structured analysis with serial image registration to improve sensitivity for detecting changes in longitudinal measures, and finite element modeling in order to understand how density and structure measures of bones are related to bone strength, stiffness, and fractures.