Ok, this one isn’t strictly Pilates, but I feel it’s important.
I have a thyroid condition, and I wasn’t happy with the medication my doctor put me on, so I did some research. Hours later, and several books and studies later, I came up with a huge list of questions that I felt my doctor should have answered in the first appointment. I felt that my condition was not treated appropriately. I also have a knee problem, and it took six years and over twelve doctors before it was finally diagnosed properly as bilateral external tibial tortion instead of patella femoral syndrome.
If your clients come to you with a condition and lists of contraindicated movements, if anything seems strange to you, or even if it doesn’t, encourage them to research their condition and fully understand it. Don’t tell them their doctor may be wrong or not giving them the full story, but do suggest that it may be in their best interests to take responsibility for their own body and healthcare.
That being said, it wouldn’t hurt you to do some research, too. 
