@gizzmo As I read your description about muscle loss in biceps and triceps, my thoughts go toward a cervical spine issue. If there is some instability in the spine, so that the alignment changes with different body positions, it can create a situation where symptoms can be intermittent. I am a spine surgery patient, and I had the same muscle loss in biceps and triceps because of spinal cord compression because of a collapsed C5/C6 disc and bone spurs. I had 2 mm of one vertebrae slipping past the other, so that essentially made my spinal canal smaller when that happened when there wasn't any fluid space left around the spinal cord. If it was aligned well, the symptoms got better. I was seeing a physical therapist who was working on me which made it better until the next muscle spasms caused the bones to move again. You had mentioned an MRI. Was that done to look at the cervical spine or something else?

Have you consulted a spine specialist? Froedert does have some good doctors. I have taken my elderly mom to doctors in their health care system and also to a spine neurosurgeon at Aurora in Milwaukee. She didn't have surgery. It was a consult about a spine compression fracture. Spine specialists also do full spine standing X-rays and compare that to sitting or lying down X-rays to check for changes in spine alignment.

I did have a spinal fusion decompression surgery, and since then, I have gotten muscle back that I lost; not all of it, but a lot of it.