Hi Steve, I hope you are doing have done hyperbaric treatments and hope they were done before replacement surgery. I have done a total of 50 dives and would do 50 more if needed.... Oxygenating the bone is the key. If you have not started or completed these treatments, call you Dr. Right away. Most insurance covers and there are dive tanks at at least one major hospital in every metro area. I did mine in Denver. I can't stress how important this treatment is in bone growth.