it is not safe to take 5400 mg of ibuprofen per day so you would be wise to see a rheumatologist for a better (and safer) way to control your osteoarthritis in your hip. i am sorry but i do not know the medical details of your particular case to know if a cortisone injection is appropriate.
i take approx 5400mg ibuprofen daily for osteoarthritis hip pain. can i still take it prior to cortisone injection?