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