Shoulder replacement surgery affects many muscles and nerves, however, after 3 months, surgical pain should be much better. This is what your doctor is treating.
Your doctor may have explained that once surgery is healed, you will need some extensive rehabilitation via physical therapy to adapt to your new shoulder. Inflammation must be worked out of soft tissue, muscles must regain tone and elasticity. While this exercise will cause some discomfort, it should not require opioid pain medications, and the anti-inflammatory effect of an NSAID like aspirin will help reduce some of that inflammation.
When you say a "whole lot of aspirin" remember to stay within recommended daily doses, and always take aspirin with food to protect your stomach.
Ice and heat pack applications, hot baths, and self massage of the muscles of the chest, shoulder, and back will promote healing and reduce pain.
Best wishes in your recovery.
Hi I just had shoulder replacement. It will be 3 months in Jan but my doctor wants me to stop taking pain medication and take a whole lot of aspirin. How will this help?
Pain will only relieve with physiotherapy and if it does not decrease over a period of time of 3 months after surgery you should go near your operating surgeon to know the reason of the pain. I do not think you would need any surgery, even with nerve irritation or some inflammation with a tendon it might occur. Good to diagnose your problem and then go for cure. Take care!