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Message: [QUOTE="upperdeck, post: 4422496, member: 474"] some studies that came out this spring The researchers found that 74,620 estimated football-related ACL injuries occurred on artificial turf and 122,654 on natural grass. also the same study The injuries were contact-related for 50.2% of football-related ACL injuries on artificial turf and 60.8% on natural grass. so of the injuries 10% more non contact ones. Nothing in the study mentions number of games played on the various surfaces though. [/QUOTE]