@predictable, thank you! You gave me a lot of good info. I didn't think to consider that the thyroid could be the cause of the Vitamin D deficiency. I was considering them to be separate issues. Holding off on the vitamin D is probably a good idea until I see the doctor. I joined after my TKR. I was joking with friends that I was going to be like the bionic woman when it was over. Hence the name bionic knee. At that point I did not know I would be having surgery on my shoulder and other knee. I now tell people that I am being refurbished. 🙂