Clonus

I guess I should post the definition of clonus-- "muscular spasm involving repeated, often rhythmic, contractions"

Sam, when you say that your "left foot does it daily at least once", you mean it has a series of spasms, right? I'm affected with it much of my waking time. It's very annoying and even tiring. Thanks for responding.

Ok. That makes sense. Even though I have mine mostly all the time, if I sit something (like a milk carton) on my stump, then it really goes wild. It would toss a carton of milk into the air!