@elucidator I just came across your post. One thing to consider is when you have multiple places of nerve compression, they could all be contributing to symptoms, and can confuse things a lot. I had carpal tunnel surgery that helped somewhat, but did not relieve pain completely because I also had thoracic outlet syndrome that was missed at the time. TOS causes a compression of the ulnar nerve. Much later, I also developed a spine problem due to a collapsed disc in my neck, and that contributed to muscle loss too. TOS is often missed by doctors because they don't understand it. It's good the injection was done as a diagnostic test, and that it helped you. TOS has overlapping symptoms with carpal tunnel syndrome. I would recommend being evaluated for TOS at a place that treats TOS if you have not done that already. It might give you a better picture or rule it out. TOS is often posture related, or from injury or repetitive stress. I was evaluated at mayo for TOS prior to my spine surgery there.