This article was originally posted by Ed at the original HillRunner.com Blogs.
Here is an interesting article with some research that has given me something to think about. The idea of changing your foot strike depending on your particular issues such as knee pain versus ankle or Achilles pain is interesting.
https://archive.nytimes.com/well.blogs.nytimes.com/2013/10/16/pounding-pavement-by-heel-or-toe/?_r=0