 [ Symptoms ] hit in an arm repaired with plates from fractures 10 years ago it does not hurt but aches with weight plate damaged  i had 7 fractures in my humerus and it was repaired with a stainless steel plate and 10 screws the collision was on the side opposite the plate i was in tremendous pain right after the collision but it mostly subsided within 30 minutes there is no bruising or swelling i have full range of motion and have no problem lifting things straight up however there is a somewhat constant ache and pain when i lift to the side also there is pain if i try to lift a lot ex 3 pushups [ Disease ] it is doubtful you could damage a stainless steel plate from a blow that did not even produce any bruising or swelling that does not mean you did not aggravate the surrounding tissue or injure a different structure such as a tendon or ligament the only way to really tell what is going on is to see a health care provider for a physical examination given your description however you might also choose to take a watch and wait attitude you can try resting the arm or avoiding those motions that cause pain to see if the pain clears up sometimes a little rest is all it takes if the symptoms do not clear up or if they get worse    or if by some chance you develop a fever    then i would suggest you definitely seek medical attention any time symptoms go from better to worse instead of vice versa it is worth a trip to the doctor hope this helps