Depends. If there is an inferior spur then a subacromial deconpression is an option. It its just ac then a distal clavicle excision could be done. Neither surgery is. a slam dunk. If you can confirm AC joint pain then it also helps with specific PT
I don't do many AC joint injections. However I had a bank exec come to me on high dose oxycontin for shoulder pain with radiation into the axila. I tried a bunch of different stuff. Finally I did an AC injection. 100% relief and he came of the oxycontin (which was not coming from me).