I've been doing some reading lately about how MK4 (a version of vitamin K2) is thought to be necessary to make bone. This was in relation to osteoporosis but I can't imagine it wouldn't apply to a broken bone. It's not recommended to take K2 by itself but in conjunction with D & A. Below are some links to consider some nutritional supports.
Here are some nutritionally related things to consider:
https://nbihealth.com/mk7-hip-fractures/ (this is a supplement company link so take with a grain of salt)
http://debrasnaturalgourmet.com/bone-health-101-part-i/ (this is my local health food store)
https://chriskresser.com/my-healing-..._campaign=blog