A bit of both, I've broken the foot and had 3 lots of surgery on it, but it was also an accumulation of too much training, not enough stretching and even worse, training when injured . I'm now stretching, having regular sports massage (this has helped no end) and looking after myself a lot more.
I can hardly wait for 2014 and as someone said to me, missing one season might not be such a bad thing both physically and mentally - I'll let you know the answer to that after South Africa.
The foot needs to be re-aligned - I had major issues at IMUK and it's taken multiple x-rays and scans to get it finally diagnosed. The boot is more protective now in that the consultant doesn't want me to go back into "lazy" mode when I'm walking - running is out due to the impact and the need for the foot to be totally re-aligned before starting back. Cycling is ok, so long as I have an insert placed into my shoe to keep the foot straight and I come out of the pedals with the other foot.
I've kept relatively fit and having dnf'd so many times last season due to the injury and illness my motivation to hammer next season is so high. Not only that, I'm on the edge of the plank on the pirate ship - need to get back on-board!