NFLPA president J.C. Tretter: NFL must make decisions from 'medical lens'
NFLPA asking teams to change all fields to natural grass
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Aaron Rodgers' season-ending injury highlights controversy over artificial turf as playing surface in NFL
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Browns center JC Tretter elected next NFLPA president
NFLPA president says 2022 season data proves natural grass is 'significantly safer surface' than turf