Thanks for your thoughts Cugila.
I am not undertaking an ongoing course of steroid treatment, but a one-off injection under X-ray into the hip joint capsule itself. My hip cartiledge on the top of the femur has gaps in it (worn out!), and the injection stops the inflamation and pain for about a year. The next one lasts about 6 months, and the third about 3 months. Then they will give me a total hip replacement. All this has already happened with my left hip, and now my right one is packing up. Total Hip replacements (THRs) have a limited life (10 - 15 years), and can only be done twice, so are delayed as long as possible. Once the second repacement has worn loose, you are in a wheelchair for good! My surgeon and I did discuss the problems of diabetes and steroids, but it is the lesser of two evils I'm afraid.