I suggest you see a neurosurgeon and have an MRI I do know stenosis can
cause paralysis and the lose of bodily functions. Can you stand on your heels
and your toes? If you can't it's a sign that your nerves are being pinched!
I have stenosis but my surgeon won't do surgery until it gets to the point that I can't stand on my heels or toes because i'm on warfarin and can'tnget off of it until it gets to the point that I stated above about toes and heels.
I'm not a Doctor but by intuition I would say that orthopedic problems can not be "fluctuant" .
Neurological problems can be fluctuant although I have never heard of anything like 20 seconds paralysis. you should explain yourself better