"Lhermitte's sign"I had and still have this...
I had two cervical spinal fusions about 5 years ago.
Whenever I bend my head and look down toward the floor, I have a shock-like sensation that I feel through my abdomen and the inner parts of my thighs.....
When I presented with this "sign" and other symptoms -- the doctor said he knew before he examined me that I had compression on my spinal cord in the cervical spine region.