About 4 years ago I was in a hard heelside, lost my edge on a patch of ice in the shade, then caught my edge again during a slide out on my left side. When it caught it sent me over my board doing head to toe somersaults down the mountain. The impact when the board caught its edge again fractured the Talus bone in my ankle. (Not sure of spelling.) They call it a snowboarders fracture. Usually caused by excessive chatter on a heelside. No surgery because it all held together, but had fractures in a few parts of that bone. After being casted up for about 5 weeks, it was tender. Took two years riding slow speeds and quick turns in the trees on softboots avoiding chatter before I would try the hardboots again.
After talking with Fin at Bomber, we are now using the suspension kit (extra elastomer pad under my TD2's) and I have some gel heel pads in my boots to absorb possible chatter and impact. Seems to have helped. Don't know if this info will help in your situation, but may save you from other problems down the road.
Fin mentioned using the BTS kit on my boots to provide some additional give to save my ankles and feet. They seem to be out of them every time I look at the site to order them so I haven't got a report on whether those have helped or not.