Knee pain, cant bend straighten or put weight on

Patient: My wife stepped off a stage and now cant walk or put weight on her right leg. she can not straighten or bend her knee and can not put any weight on it. it doesnt look swollen but she can not stand , bend, straighten or put weight on it. dont know what to do. she thinks her knee locked up. has very sharp pains around her knee area.

Symptoms: Sharp knee pain, cant walk , straighten or bend right leg