I had an interesting conversation with a UK orthopedic surgeon a while back. He said that in their football players (soccer), it is not rare to see Achilles ruptures. He said that at one of their conferences, there appeared to be a pattern to see these injuries occur when players made a change from one playing surface to another (grass and turf) either way, not including practice time surfaces. Just for the heck of it, I looked at Demeco and Posey.
week before rupture-Metlife Stadium-turf
week of rupture-Arrowhead Stadium-grass
week before rupture-Reliant Stadium-grass
week of rupture-Gillette Stadium-turf
Just found it interesting.