I figured the mechanism for Achilles problems is basically this:

- the leg is forced backward on the ankle joint surface, and driven into the Achilles tendon sheath "zone" which causes inflammation to actual injury.

The human leg is actually very well force balanced, just sketching it out. But over-development, shortening of the calf and quad chain will tend to pull the lower leg. And running you are driving the leg off the sole of the foot adding a lot to that rearward force. My theory is this overloads the (weaker) opposing muscle groups that try to maintain leg position - and you could get shin splints as well.

In my case, it's pretty simple - my ankle joint has been damaged and can no longer stabilize the leg from exceeding it's range limitation. In other words my leg is wobbling all over the place on top of my foot.

I've got to do something to prevent rearward leg deflection and keep that ankle together (or quit trying to run!). So far I found this and will look for other taping solutions. But for those with Achilles issues you may want to give it a try:

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