I suspect that's an "accessory" bone that usually fuses with the both next to it to become the navicular. In a small percentage of people, it doesn't fuse and can protrude (as you see).
I have this accessory bone and, while it doesn't protrude like yours, I have irritation as well. My doc recommends the bone be removed. It's fairly dramatic surgery in that tendons holding up the arch have to be moved and the recovery time is lengthy. I'm not in that much pain so I'm holding off on what is obviously irreversible surgery. I've also heard of fusion surgery. No idea how one chooses which.
For me, a supportive orthotic has been very helpful. Hard to imagine an orthotic would 'fix' your more dramatic protrusion but it's certainly worth trying.
Edited by: PASTAFARIAN at: 9/11/2012 (17:44)
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