Tending To 50yr Old Sister With A Broken Talus Bone

tending to 50yr old sister with a broken talus bone in her rt foot. the left one broke 2 yrs ago. screw put in 8 days ago and was told showing no healing signs at brake .. looking for supplement to help in healing of bone. Told to use bone stimulator but not started yet ... patient did not have accident for any cause for either break