@debbiepinkston59 I had also responded to your other post. I had been looking up information and the biceps would be affected by problems at the nerve roots in the areas of C4 through C6. Does he have imaging that shows spinal cord compression? With craniocervical instability and bulging discs in C4-C6, there could possible be multiple points of compression of the spinal cord.

I did experience muscle atrophy of biceps , triceps, and muscles on the back of the shoulder on the scapula. Spine surgery decompressing my spinal cord improved all of that. I lost about half of my muscle volume and got back about half of what lost, so I still have a bit of a deficit although my functioning is pretty normal.

Can you share any information from imaging reports or a specialist opinion? Does he have a diagnosis of myelopathy or myomalacia?