When I went to see my podiatry specialist about my ankles he asked if I’d had them scanned, the implication being that it might be possible even for something as non-disabling as my old injuries. I said no, but I have no idea what the prospects would be if I asked to have it done. I’m not sure in my case whether it would have to be NMR or whether X-ray CT might tell me anything useful. In your case it sounds like soft tissue, which would pretty much have to be NMR wouldn’t it ? In the meantime I guess you’re into RICE.