I doubt anyone could tell you positively on this board if a hip replacement will disqualify you.
You need to contact the airline you are looking at and ask them. All Chinese airlines have a pseudo doctor on staff and he will know the answer to this question.
It also depends on what your value is. If you are an A380 captain with time on type and China Southern wants to hire you then they will push aside as much as they can to get you on board. If you are a CRJ captain, like the thousands out there available , then expect little help.