A year ago I slipped on the ice in the driveway and cracked my head on the ground. I required 2 stitches, there was blood everywhere and I had a nasty concussion. I did not lose consciousness so I assume that was the reason I did not get an MRI or CT scan. It took weeks for the bump to go away, in fact even after the stitches came out the skin didn't heal for weeks either, too much old blood buried underneath.
This winter I haven't had any such scares because Hal took matters into his own hands and doctored my boots with #6 3/8" long hex head screws. There are 11 in each sole and they have done wonders for keeping me upright and steady on my feet. They do slip a little if the ice is really smooth but there aren't a lot of patches like that around here and eventually the heads do grip the surface.
It feels good to have confidence walking again.