Research shows “statistically significant higher risk” of lower extremity injuries on slit-film turf

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The NFL has stirred up a hornet’s nest regarding the question of field safety.

It started last week, with Cowboys owner Jerry Jones trying to argue that artificial turf fields are every bit as safe as grass fields. The NFL, during a media conference call scheduled primarily to talk about the looming game in Germany, cited specific statistics that tend to.support Jones’s position. (Note: There’s almost always a specific statistic that will tend to support any position.)

On Saturday, the NFL Players Association fired back. NFLPA president JC Tretter posted a column with a series of action items, including a plea to remove all “slit-film” turf fields.

Many had never before heard that term. Seven of the league’s 32 teams (the Giants, Jets, Lions, Vikings, Saints, Colts, and Bengals) use slit-film turf. Slit-film also is used at Tottenham Hotspur Stadium in London.

“The injuries on slit film are completely avoidable — both the NFL and NFLPA experts agree on the data — and yet the NFL will not protect players from a subpar surface,” Tretter wrote.

Tretter’s column was followed by a social-media campaign from numerous players, who spoke out about the issue of field safety.

The NFL fired back on Saturday afternoon, with NFL executive V.P. of communications, public affairs, and safety Jeff Miller claiming slit-film surfaces “have 2-3 more injuries per year, most of them are ankle sprains — a low-burden injury — whereas slit film also sees a lower rate of fewer high-burden ACL injuries compared to other synthetic fields.” Miller added that “the league and NFLPA’s joint experts did not recommend any changes to surfaces at the meeting but agreed more study is needed.”

The NFLPA, which has yet to formally respond to Miller, would surely take issue with his statement. PFT has obtained a slide prepared recently by Biocore, an outside firm that provides engineering analysis for both the league and the union.

In the slide, Biocore explains that “slit-film has a statistically significant higher risk of LEX [lower extremity] injury than the League average,” explaining that independent analyses from Biocore and IQVIA agree on that point. The slide also says that “models suggest there are 2-3 more non-contact lower extremity injuries per season per stadium on slit film surfaces than other types of synthetic turf fields.”

Finally, the slide asserts that, when teams are considering new and replacement fields, “existing natural and synthetic surfaces in use in the League offer lower injury rate alternatives to slit-film.”

This is a conclusion from a company hired by the league and the union. And it’s not 2-3 injuries per year; it’s 2-3 injuries per stadium per year.

The problem with slit-film turf comes from the construction of the various fake blades of grass. Instead of a single blade of fake grass (monofilament), slit-film has openings in the pieces, creating a potential risk of cleats catching in the material.

And so, even if it’s impractical to retrofit domed stadium with grass, the six slit-film turf surfaces (the Giants and Jets share one of them) in the U.S. and the slit-film turf in London should be replaced ASAP with monofilament fields, in the opinion of the union.

Other than cost, what’s the argument against it? Then again, from the perspective of those who pay the bills, cost may be the only argument that is needed.

Ultimately, football is business. It’s a business premised on maximizing profit. And it’s no coincidence that the field regarded as the best and most pristine, despite its location, is maintained by the one team that doesn’t have an owner who eyeballs the net revenues for buying the next generation of superyacht.

32 responses to “Research shows “statistically significant higher risk” of lower extremity injuries on slit-film turf

  1. Fake turf and domes make the game feel more shallow and plastic. Grass, outdoors, is where everyone starts playing the game as kids. It’s something that resonates, that always feels real and right. The further the game gets away from it, the worse.

  2. They’re a billion dollar business they can spend a couple million to upgrade to a safer turf field

  3. Bet if either golden boy Mahomes or Allen we’re to unfortunately incur a career ending injury on one of these crappy fields it would be fixed lickety split.

  4. It’s not only the owners who do not care about the injuries from these fields. There are plenty of fans here who say that “millionaire players” should not complain about playing conditions. The league and the owners know that a segment of the fan base treat the players as entertainment objects instead of human beings.

  5. The late, great Tug McGraw on whether he preferred AstroTurf or grass: “I don’t know, I’ve never smoked AstroTurf.”

  6. A man with one hand in a pot of boiling water and the other encased in a block of ice is statistically on average quite comfortable.

  7. For Jeff Miller to twist the statistics so horribly – my goodness!!! Shame on the NFL for doing so! Do they not realize how much credibility they lose with each and every twist? How to lose faith in leadership example #12,302.

  8. It sounds like the slide to which you refer does nothing to contradict what the league rep said, and yet you’re making it out to be some sort of smoking gun.

  9. gibson45 says:
    November 14, 2022 at 10:57 am

    It’s not only the owners who do not care about the injuries from these fields. There are plenty of fans here who say that “millionaire players” should not complain about playing conditions.

    ===

    I’ve never seen a single comment from anyone saying this about the playing surface, and I bet you can’t find an example either.

  10. It would be nice to actual see the data. People say all kinds of things and then claim the data backs them up. It has been my experience when the data is relied upon to make a decision then said data is not provided; the person making the argument is full of it.

    What am I to infer from 2-3 additional injuries per stadium per year. So are those injuries evenly spread out over those specific fields? Or all concentrated to just a field or two. How many injuries do occur for each stadium each year? How do we know how significant such an increase is; could simply be statistical noise. I don’t know without the data. My random google search so far has been inconclusive.

    At the end of the day, doesn’t seem like anyone is really trying to move the needle on this one. So nothing will get done. Other than another bullet suggesting the NFL doesn’t care about player safety. Regardless if it has merit or not.

  11. For the fans who say “they get paid millions, they need to accept the working conditions,” once you have an ACL or meniscus tear, you are at high risk for arthritis. That is pain for the rest of your life.

    The big concern here is non-contact injuries. Guys getting hurt not even playing the game.

  12. Artificial grass=bad. A 6 ft 1 in/240 lb linebacker running as fast as he can and hitting you as hard as he can=good

  13. NFL owners want their turf designed by Ron Popeil instead of grass maintained by George Toma disciples.

    Keeps costs way down, when they can just Set It and Forget It.

  14. cowboysfan8369 says: “Bet if either golden boy Mahomes or Allen we’re to unfortunately incur a career ending injury on one of these crappy fields it would be fixed lickety split.”
    —————-

    Right, because career endimg injuries have never happened on grass before…

    Where’s your OuTrAgE!! there??

  15. Four of the 7 teams have outdoor access to the sun which helps grow grass so there is no reason for turf.

  16. It starts at the top. The reason owners like Dan Snyder can run a toxic workplace and have fans pay a premium for a dilapidated stadium is because the league doesn’t listen to players or fans, unless something becomes a class-action lawsuit with lots of media attention!

    This is no different. The league won’t take this seriously unless forced. I’ve always found it baffling that NFL owners are willing to put their own players in adverse conditions, but here we are again!

  17. You can ask Packers rising star rusher Rashan Gary. His season ended at Detroit when he turned to make a tackle and his knee popped. He was untouched, no one was around him. His foot caught on the turf and gone for the season.

    It’s possible that injury could happen on grass but probably far less likely.

  18. If you’ve ever seen a grounds crew with hoses spraying down a turf field before a game & at halftime, now you know why. Also, Tottenham’s soccer team plays on a grass field, the turf field is used for NFL games.

  19. “A man with one hand in a pot of boiling water and the other encased in a block of ice is statistically on average quite comfortable.”

    Not even close, but thanks for playing, That’s not how statistics work.

    When a difference is deemed to be “statistically different”, it means that the difference is NOT a coincidence and has a real cause.

  20. The Vikings have been fairly progressive on a number of issues, and I’d love to see them take the lead here in replacing their own slit film turf with monofilament. If the data does show more injuries, they need to do right by Jefferson, Cook and everyone else on the team.

  21. daveisright says:
    November 14, 2022 at 11:42 am
    It would be nice to actual see the data….What am I to infer from 2-3 additional injuries per stadium per year. So are those injuries evenly spread out over those specific fields? Or all concentrated to just a field or two. How many injuries do occur for each stadium each year? How do we know how significant such an increase is; could simply be statistical noise.
    _______________

    There is no need to infer anything. 2-3 more injuries per year per stadium is a factual statement that means exactly what it says.

    There is no such thing as “statical noise”. There are those who don’t understand how statistical analysis is done.

  22. If this study is true, then if for no other than selfish reasons it makes sense for teams to switch turf for the health of their players and success of the team.

  23. I dunno, this may sound stupid as I am no botanist. States that have legalized marijuana have large indoor facilities that they grow pot in using a buttload of lighting, controlled climate, etc. If this can be done why can’t they grow natural grass playing surfaces inside domed stadiums ?

  24. All I know is When I played on it as a high school lad it grabbed my cleats. Grass didn’t do that.

    As fast and heavy as these guys are I’m sure it’s much worse.

  25. Most of these teams don’t own their stadiums and don’t pay for the turf anyway. The Bengals can just bill Hamilton county and they can lay off a few more first responders to pay for it.

  26. “Grass versus turf” is not the only issue. Some of the grass fields in the NFL look like the teams graze sheep on them during the week. For years the field in Pittsburgh has been as bald as a novice’s knees in some places.

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