interesting, according to wikipedia, titanium is ok for an mri
been back to the physio, he reckons it is the fat pad that is hurting, caused by weak left glute, groin muscle is dominating and tight ITB all conspiring to make my left knee fall inwards when I run. He masssaged the fat pad, and I can confirm that that was incredibly painful. Anway, he told me I should swim normally not with a pull buoy and also cycle normally as other wise I'll lose muscle and it will take me ages to get back back to normal training.
so, tomorrow I will thrash the spin bike in the gym, would rather test this out in the gym and not end up miles away from home and having to cycle back in pain
if that is ok I might treat myself to a sufferfest session on friday - haven't had chance to sample them since downloading them a few weeks ago