biomedical eggineering

An adjustable device is designed to apply a traction
to stretch the tibia. It is attached to the tibia by
rigid pins as illustrated below. There is a mechanism
for length adjustable in the centre of the vertical
section.
Draw a free-body diagram for each of the three
straight sections of the device, showing the forces
and bending moments to which each is subjected.
Discuss the criteria that you would use to determine      
the required dimentions of this device. What are the
potential failure mechanisms? What materials might be
appropriate for the manufacture of this device, and
why?
Estimate the mean cross-sectional area of the tibia
and, assuming that its youns's modulus is 10000 Mpa,
calculate the load required to stretch it by 1mm over
a length, L, of 300mm.
Determine appropriate cross-sectional dimensions for
the vertical section of the traction device to enable
it to sustain this applied load.
Review critically the assumptions that you have made
in your analysis of this device.