Hi davo -
Thank you for giving us more information as to what you have been going through this past year.
I don't have any experience with this at all but hopefully others will come along that do have some experience.
May I suggest that you might like to post this on the Orthopedic Forum. I will give you the link to that Forum. They might have more information for you on what you are experiencing with your foot changing colors in the shower.
Here's the Link:
http://www.medhelp.org/forums/Orthopedics/show/60
I hope that you will let us know what you find out.
Know that we are thinking of and wish you the very best..........Sherry