The "turf" that everyone sees is really more for looks, I could be wrong but I don't think the fake grass part does a whole lot. It's pretty slick. It's the underneath, which is basically a bunch of rubber pellets that does most of the work. If you take a stadium tour you can walk on the field and see it.
I think turf keeps things constant whereas grass/dirt there's more variability. Is the dirt wet, frozen, dry, etc. I think that makes it difficult to compare the two.
Do the Vikings practice on grass? I think when Childs had both knees blow out it was on grass. I think if anything it has to do with players are getting bigger and faster and it's harder for certain parts of the body to keep up with the stress.
"Near Complete ACL Tear" For Dalvin Cook Reported By NFL.com
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