IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-9-36483 Original Research Paper Prevalence of osteoporosis in sub–urban population of Chennai using QUS (Quantitative ultrasound) of Calcaneum –A Cross sectional Study S.Balameena Dr. Dr Karthikeyan Dr. Dr Sabarish Dr. September 2021 10 9 01 02 ABSTRACT