have been reading a few message board threads on Haglund's over the last year or two since my heels flared up again. I have some 10 years experience of managing my heels with varying success. There is a lot of varying information out there and some of it, IMHO, of varying accuracy and up-to-datedness. undoubtedly there is a tendency for those with the most stubborn cases to spend more time online writing about it rather than being out running which i think gives an unduly pessimistic slant on the condition. If you want to have a look at some of the peer-reviewed published papers on the subject go to
http://www.ncbi.nlm.nih.gov/pubmed/
and search with 'haglund' and 'achilles' at the same time as subjects (not Haglunds or Haglund's). I believe that surgery is generally pretty successful and that regrowth of spurs long term is uncommon.
Having said that, with the benefit of hindsight, in the earlier stages it's all about the shoes. I wish I had been much more proactive earlier in the course of my problem. from 18 to 40 years of age i was wearing uk size 9 or 10 shoes. for years i cut chunks out of the heels to avoid rubbing on my haglund spur. this never worked very well for me. belatedly, i found that i could run and play football perfectly well in size 12s with a gel pad behind the heel. you can order sheets of suitable fabric-backed gel from podiatrist websites. i found best set up is a gel pad under a piece of tubi-gauze ove the heel and then a sock on top.
also, on flat ground i can run in open backed sandals (after experimenting with a few brands). I've done several triathlons in them now. saves tying laces too.it takes a slight style adjustment when running. lean forward and shorten stride. on rough ground or around the house if you wear open backed sandals a lot then evetually you will smack you heel on something hard and make it a lot worse. been there!
secondly, it's possble to cut the viciously sharp heel counter out of most running shoes -go in through the back cutting along the top edge of the external 'leather' piece and then peel apart the inner lining and heel piece to get at the plastic counter -with a bit of a struggle you can cut it out along the base. it's vital to get it right down to the base -any sharp projections are a recipe for chewed-up heel disaster.
don't expect everything to resolve overnight. my left heel took about 6 months to settle after stopping wearng any hard heels. if you stop the rubbing any bursitis between achilles and skin will eventually resolve in my experience.
the problem that eventually drove me to surgery on one heel was recurrent retrocalcaneal bursitis (in front of achilles -between tendon and spur). in my experience, once your spur reaches a decent size, then retrocalcaneal bursitis and impingement of spur on achilles is likely to limit your mileage. i know my surgeon personally and i believe him when he says that removing spur and bursa without totally detaching the achilles isgenerally successful in 90% of patients and serious complications are uncommon. return to full athletic function is likely to take 4-6 months tho.
good luck all!