What kind? The answer is likely yes regardless. Look here for a great review of chiropractic mua: http://www.Bartosekchiro.Com/mua.Html.
Should be. Manipulation under anesthesia should not involve manipulation of your breasts. However, if a great deal of work is to be done on your shoulders, it possibly can rotate an anatomically-shaped implant. I have seen this happen in very athletic patients. Make sure your physician understands the fact that you have implants.