Having had MRSA before my surgeon has put me on clindamycin 3 days prior to explant surgery. Is that standard procedure?

Thank you for sharing your excellent question.  There are treatments aimed at attempting to eradicate MRSA in patients who chronically carry the bacteria but clindamycin three days prior to surgery is not one of them.  That said your surgeon is trying to minimize the risk of recurrent infection by starting the antibiotics early.  Though data only supports antibiotics immediately prior to surgery your surgeon is being precautionary.  Hope this helps.