[zeestephen]

Football players usually take a full year to recover.

Speed players, like running backs, usually tear up their knees because of constant high speed collisions.

Offensive line men and QBs usually tear ACLs when they have a leg firmly planted on the ground, and a really big guy falls or rolls into it.

[Dahoser]

I think a fair amount of cruciate tears are non-contact from getting locked by turf because something has to give and that something is a cruciate.