You Are To Design An Intramedullary Implant With Changing Modulus To Fix A Long

You are to design an intramedullary implant with changing modulus to fix a long bone fracture. The fractured bone should be protected mechanically at the beginning for stability. As bone healing progresses, the healing bone should experience more functional stresses so that it may become stronger ( avoid stress shielding). Should the implant has a increasing or decreasing modulus with time? Please explain your answer qualitatively.  

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