I've had a number of people reach out to me directly about this so, I figured I would do a follow up on here...
As I mentioned above, I had tried everything and gotten just about every solution possible. I was headed out to IMAZ (to spectate, not to race), and I already had an appointment lined up with a highly recommended podiatrist out in the Phoenix area. Coincidentally, I was on a conference call with Matt Dixon around 2 weeks prior to the trip and we discussed this very issue. Matt made the suggestion to see Dr. John Ball of Maximum Mobility Chiropractic. Dr. Ball effectively gave me a thorough evaluation and gave me very specific things to work on from there. He targeted the pain, which happened when I stood on my toes with one foot... the pain shot directly through the nerve. He did soft tissue work... tough to describe, but he effectively did a form of ART which gave me relief from 95% of the pain in a matter of 10 minutes. I'm not sure if all ART folks would be able to do this, but Dr. Ball has a great intuitive feel for this and gave me great relief such that I was able to run for nearly an hour that week, when I hadn't really done ANY running for 12-18 months prior.
The other causes were issues structural in nature or had to do with my gait. I have high arches and wide feet. I switched to Altras (soon after I found out they existed) and their shoes work 100% better than any others. Zero drop and a foot shaped toe box, which doesn't pinch my metatarsals nearly as much as any other. The only thing better would be custom shoes, which I'm not sure I could afford. Side note: I tried 2 different styles of custom orthotics and really saw no benefit at all from them. In fact, they made it worse. The other issue I had was in my ankles and achilles. Basically, when I was running, I would land on my toes and my ankles would stay very rigid and not allow my heels to come down to the ground. So, it put a lot of pressure on the metatarsal heads and also on the ankles and achilles tendons. Aside from the usual eccentric heel drops, we did a variety of ankle mobilization exercises and dynamic movements (hops, jumping rope, etc) designed to land more on the midfoot and also allow my ankle to flex and the heel to come down upon my foot striking the ground. I spent an entire winter (5 months) in Phoenix working on this, and ultimately my form was changed dramatically.
At this point, I'm back to full capacity, although I generally keep my running mileage much lower than most. I supplement a lot by doing things like deep water running, running on softer smoother surfaces, and I still use PowerCranks regularly as well.
In hind sight, this was a much better option than surgery, and I'm glad I went the route I did. I highly recommend Dr. Ball to anyone, even if you're not in the PHX area. His reviews are about as close to unanimous as any doctor I've seen. He has a great intuitive feel for the structure and mechanics of running and has worked many folks through what may seem like complex overuse type injuries.
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John Kenny, Pro Triathlete, USAT Certified Coach -
http://www.frenchcreekracing.com Philly Masters and Open Water Swim and Multisport Events