TMoz,
I'm not a medical professional, but just a fellow MS patient. I don't know of any reason why MS would contribute to slow healing. It's not like lupus or scleroderma which can cause slow healing.
Although the doctor said 6 weeks, you probably already suspect that it might take longer. Be sure to follow the doctor's advice on how to care for your foot. I hope that your doctor will reevaluate how your foot is doing in a few weeks and make adjustments to your expected healing timeline accordingly.
Hope you are are doing well besides the broken foot (which is bad enough itself). Take care of yourself.
Lisa
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