Thanks for posting,
Your bowel disturtubance could be due to the effect of tramadol intake (side effect). Side effects of tramadol with bowel symptoms (constipation
, nausea, vomiting
etc) and it could also make you have other symptoms such as asthenia/fatigue, nervousness
, euphoria, anxiety, pruritus, somnolence etc.
Your bowel grumbling could hardly be as a result of your TKA.
Well it is possible that you might have contracted an intestinal infection such as virus, bacterial, fungi, parasite that could also make your stomach grumble (but that will be unlikely given that grumbling stomach is hardly a typical symptom of bowel infection). Most cases of grumbling stomach is of unknown cause and may just occur as a result of dyspepsia/indigestion
or being with an empty stomach.
Hope this helps