Had excact same. The prothsesis parts that aren't titanium are vunerable to infection.Mine got an infection. The infection spread to entire body, via the blood. After couple years mismanagement they prescribed a very powerful antibiotic that rid my body of the infections, but parts of the prothsesis still flare up. I will always be on permanent antibiotics, they limit the infections spread . Replacing the prothsesis is highly unlikely to make it better, it very well could make it much worse. I'll do it if my mobility becomes affected only. I've had to stay in hospital for the iv antibiotics twice in 20 yrs. The infection is never entirely killed, its management forever. I had three drain sites , now its down to one. The infection site on prothsesis is size of match head. Its a standard staph, if were mrsa, or vrsa, i'd have no choice about trying to replace it. Antibiotics forever and i've used colloidal silver also during the worst phases. It does seem to help. My girlfriend was required to take antibiotics at one stage, to stop the staph bouncing back between us. She refused, i got rid of her, and improved straight away.