Differential bone element The x-ray image shown here shows of the principle stress directions of trabecular (or cancellous) bone in the coronal plane at various locations at the proximal femur. At the chosen single region of interest (1), for a differential bone element at that region, assume ox is a compressive stress of 40 MPa, oy is a tensile stress of 5 MPa and Txy is a shear stress of 7 MPa. (a) Calculate the principle stresses at the specified region of interest only (10 marks). (b) Explain the significance of the ability to perform stress transformation in laboratory experiments (8 marks). (c) Explain the overall principle stress directions of cancellous bones in the context to Wolff's law (3 marks). (d) Explain the overall principle stress directions of cancellous bones at region of interests 1 and 3 in the context of form vs. function (4 marks).