Hi, thanks for writing to HCM.
It is not uncommon to lose a certain degree of motion in the adjacent joint after a fracture
due to the tightness that develops in the soft tissues around the joint.
This is not going to hinder any movements in the hip or back and will not have any impact on other joints. And there is absolutely no risk involved. The only risk involved is, while doing martial arts don't get injured yourself.
Hope this information is helpful. Good luck