Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. The symptom can be due to B12 deficiency (relieved by oral /injectable B12 supplement) or irritation of nerve supplying to the arm. This would vanish in few months by itself. Continue with post operative exercises advised. If pain does not reduce, consult the surgeon. Hope I have answered your query. Let me know if I can assist you further.