It could also be the power steering belt as well..
My Steering Wheel Got Tight While Driving And Now I Can't Turn It At All, Why?
I can only give you a generic answer it sounds like part of your steering linkage has worn out or broke.....if your lucky the power steering pump is worn out/broken or your belt is not powering the pump because it is slipping...hope this helps
Did your power steering go out or did something in the steering shaft break