The Hallux op was performed because my Abductor Hallucis tendon had begun to calcify, and had also avulsed a chip of bone from my 1st met head. It was interferring with my running so when I had the chance I had it corrected by a podiatric surgeon.

The deformity itself was relatively mild, but due to my years of running the problem degenerated faster than would normally be expected.

The surgeon did an osteotomy - corrected alignment of the first met, altered muscle imbalance and cleaned up the area. I have had the same procedure performed when I was 13 by the same surgeon on the contralateral foot, and have had no problems with it ever since, so I am not too concerned about the actual surgery. As far as I have been able to tell my arch has not been altered, but I am wondering whether the correction (either surgical or behavioural) is causing me to invert more on initial contact as I have had a little bit of trouble with ITBS on the same leg - it has been relatively mild but frustrating all the same. Any thoughts?

No I honestly have no idea, there are no other obvious factors (that I can think of) that may have triggered it.

Thanks for the suggestions.
Cheers