After they try to fight this ache with ache killers, kidney hurt and ulcers in many cases are the Unwanted side effects. In my opinion, you will be improved off changing your knees than your kidney(s) or belly for instance. The surgeon will focus on this on a person foundation. https://www.theorthopaedicandpainpractice.com/unlocking-the-mystery-of-knee-replacement-surgery-everything-you-need-to-know/