NFL Players Association president J.C. Tretter pushed back on data showing there wasn't a discernible difference between the frequency of non-contact injuries across natural and artificial grass surfaces.
ESPN's Kevin Seifert reported in November that research from IQVIA, a company hired jointly by the NFL and NFLPA, showed the rate of injuries was largely similar in 2021:
Kevin Seifert @SeifertESPNData compiled for the NFL and NFLPA shows that injury rates on non-contact injuries to lower extremities are statistically the same on artificial turf vs. natural surfaces. Important context in the ongoing debate. <a href="https://t.