What is causing my smelly implant and the bad taste?

I had an implant 11 years ago which came loose last year I had this replaced and after a week came loose again I went back and had this faulty one replaced which is now stable and has been for 2 months but it smells and I get a bad taste when move my tounge around it . My dentis says that the implant needs to be replaced as he now thinks it is fractured