Don't use it you'll lose it!

[Eden]

I doubt that you've lost any fitness in only 4 days and under normal conditions this would just be a taper week. I think Knotted is more on track with the fact that your body is still healing. Do not expect it to perform at the same level quite yet.

+1 I'm on a "rest week" and I know my coach wouldn't give it to me if it was going to decondition me. I'd chalk the difficulties up the shock of the accident and the healing, not the inactivity - that may actually be a blessing in disguise for you and once you are all healed up you'll be stronger than before.