JLP,
For a copy of your x rays, call the OS's office and ask to speak to medical records, they obtain a copy for you.
Have you sought a second opinion? Seems you have had problems since the early days, being over a year a fresh set of eyes may see something else.
For a second opinion be sure to seek out an OS that specializes in revisions, they have the experience and education to figure out what is going on with troubled TKR's. Most surgeons offices will have it listed as revisions, or complex knee reconstruction.
Hope you get to the source of your pain and swelling.