Here's my situation, I'm slowly but surely making the switch to ultralgiht gear (and loving it), but I'm at an impasse here:
I've had two bad injuries in the past resulting in two torn ligaments and have reconstructive surgery on my right ankle and a fractured my navicular (navicular accessory, actually) clean off in the arch of my left foot. (Basketball was not kind to me.) The surgery was a success and I even returned to playing basketball for a while. My left ankle was put in a cast and the navicular healed, but still hurts after I've been active. In fact, it hurts every morning after I hike. I just accept it as a fact of life and stretch it out and allow my left foot some warm up time. Nothing else for it.
Anyway, I've been using a pair of Garmont Flash XCRs with good results. After a summer full of hiking, there have been no turned ankles or other injuries.
A few weeks ago, I got a pair of Vasque Blurs. They fit and feel great and are really light. but after a day hike in Harriman State Park, I'm not sure that I can see myself backpacking in them. They actually worked out fine, but I was unusually anxious about footing and I couldn't ease into the hike without thinking about turning an ankle. I can't imagine what it would be like to attempt a hike in the Adirondack High Peaks using the Vasques.
I'm looking for some advice here…
1) Is it safe for someone like me with old ankle & foot injuries to use trail shoes, or should I accept that boots are more appropriate for me irrespective of how much they weigh.
2) Are there any particular trail shoes that meet lightweight standards but that also offer really good ankle and arch support?
3) How do I judge how safely my trail runners are working out? Short of getting to that terrifying moment in which an ankle gives way under me, how can I gauge how safe my trail runners are?
Thanks!

