Thanks again everyone. I just thought I would update.

I got an email from my sister this morning about the doctor's appointment that she had yesterday. She's very upset, but everything was confirmed. The disease is worse in her right hip than in her left, but she has to be on crutches so as not to put any weight on her right hip. The only problem there, is that since she has to use her left leg to bear most of her weight, it will aggravate the disease in her left hip which will make the disease progress faster. It's a no-win situation. Poor thing. If both of her hips start paining at the same time, she'll have to switch to a wheelchair. She's so upset about all of this and still in a bit of shock. She's only 30 and just beginning to start her career. She just finished her phd and is now finishing her post doc internship, so all she has left is her license exam and finally a job out on her own. I can't imagine all of that stress piling down.