= (d) A patient in need of a total hip replacement has a femoral bone density of po = 0.29 g/cm”. If her bone density dr

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D A Patient In Need Of A Total Hip Replacement Has A Femoral Bone Density Of Po 0 29 G Cm If Her Bone Density Dr 1 (223.44 KiB) Viewed 43 times

= (d) A patient in need of a total hip replacement has a femoral bone density of po = 0.29 g/cm”. If her bone density drops below 0.23 g/cm3 she will be at high risk of fracture. Determine the maximum allowable Young's Modulus for the femoral implant E, assuming the femur experiences a constant load of Ftot = (250 + YZ) N. The Young's Modulus of the femur can be assumed to be uniform at Ef = 18.6 GPa with a bone remodelling rate of r = 0.19 g/cm3/MPa. = = = You may assume that the femoral region of interest can be idealized as a cylinder with a cylindrical implant (Figure Q1d) such that the femoral stress Of = Ef (Ftot/(EsAf + EịA;)). Wolff's law may be approximated as p = po +r(of - 00). [5] Ftot Deltoid muscle radius femur r = 14 mm Dumbbell 2-3 radius implant ri = 7.5 mm Shoulder Joint C d