Hip Replacement?

I'm a competitive masters swimmer (mid 40s) with an osteoarthritic hip. It's a question of when not whether I'll need to get a replacement. Are there any swimmers out there who have personal experience, advice, insight which would help with the making the choices of what to do and when to do it? It would also help to hear where the best sources of research information are which might help answer questions like - "will I have difficulty with racing dive starts, tumble turns or breaststroke kick (ie actions which place high stress forces on the hips)?" Thanks and happy swimming. Guy