Just found this thread. I've been struggling with this for three years now and only today had a steroid injection to see if it might help. I'm 52, fat & running 2 marathons a year! Total milage approx 1500+ per year. A new joint was discounted and so was the fusion option, so went for the injection instead. I gave running club a miss tonight just to rest it as it's a bit sore.
I've been running on the outside of my foot for 12 months to compensate for the lack of toe movement & have suffered calf issues all year. The physio spotted the problem & recommended I take action.
I'll report in a weeks time & let you know hows it's going. It would be interesting to hear how others have coped with this.