On the MGA forum here in the Uk a lady called Bea had the surgery done due to bone loss in her knee due to the steroids.

It maybe worth taking a look on their forum as some members post their email address on their profiles. You wont have access to this unless you have joined. She hasn't been on the forum for a while, but Im sure if you could contact her she would be able to discuss what procedure she had.

I hope this helps
Love
Rach