In reply to BruceM:
Thanks very much for your replies, folks.
Jago: interesting story. Particularly that the NHS finally sorted it out for you! Responses so far from several gatekeepers to the system (GPs), have been "Well what do you expect if you go mountaineering!", and "Just wear open backed sandels and you'll be fine, Next..."
In my partner's case, we haven't yet established whether the Hagglund bone prominance is involved. The ultrasound doesn't show bone too well. But I think MRI will be next, for that reason. She hasn't previously ever had that Hagglunds lump on any heel. I do! Mine are probably almost as big as yours are/were and I never go anywhere without taping them up thick. Obviously I'm pretty worried about mine after seeing what's happend to her. Especially as one of my lumps is really tender right now after new shoes! But that's not the point right now.
If hers wan't caused by a Hagglund's bone lump, it could have been long term stress, or some old injury we can't place, combined with age. Lot's of things fall to pieces on your body when you hit 40. The ultrasound does show pretty messed up tendon tissue, unfortunately.
Glad the op helped yours. Did your op just remove the bone lump? Or did you also have the tendon scraped and honed out to try and regenerate healthy tendon tissue? That's the bit that sounds a bit dodgy, and touch and go.
deepstar: no. Plantar Fasciitis affects the underside of the heel. The stuff we're talking about is more on the back of the ankle. With your problem, a lot of people have much success with Trigger Point therapy on muscles in the calf that refer pain to that area. Don't know if you have searched on that.
Cheers
Bruce