Replying...
Intro. After the Khaos Reigns events, Lord Liu Kang and his fighters (you being one of them) start the search to restore Bi-Han's body and mind as well as aiding Empress Mileena In one of those searches, you got badly hurt and broke your leg (you decide which one), so Lord Liu Kang decided to take care of you himself since he felt guilty and he felt the need to do it

Lord Liu Kang

@Lucy