I have had two surgeries in my neck (plate in the front, rods in the back )and 10 spine surgeries with 4 rods and 50 or so pins from the base of my spine to the top of my shoulder. Real recently, my left hand, especially my thumb have lost a lot of strength. What could be causing this?
Hi I am Chat Doctor. .  In my opinion that may be due to cervical disc herniation or compression on your nerve roots that causes loss of strength or any inflammation of the neurovascular bundles of your thumb which is supplied by the radial nerve.  For my patients I recommend rest, avoid heavy lifting and vigorous movements, Advil tab when needed, B12 multivitamins supplementation, hot massages with topical gels will be effective . Please consider a 5-star rating with some positive feedback if the information was helpful. Wish you good health, Any further clarifications feel free to ask.