Part B

The device shown in the figure below $($Figure $1)$ is one version of a Russell traction apparatus. It has two functions: to support the injured leg horizontally and at the same time provide a horizontal traction force on it$.$ This can be done by adjusting the weight $\backslash ($ W $\backslash )$ and the angle $\backslash (\backslash$theta $\backslash ).$ For this patient, his leg $($including his foot$)$ is $77\mathrm{.}0$ cm long $($measured from the hip joint$)$ and has a mass of $11\mathrm{.}8$ kg $.$ Its center of mass is $36\mathrm{.}0$ cm from the hip joint. A support strap is attached to the patient's ankle $13\mathrm{.}0$ cm from the bottom of his foot.