Related by context. Frequent words. (Click for all words.) 49 concussions 40 Upshaw 37 traumatic brain injury 36 spinal cord injuries 33 Freeney 32 Irvin 32 helmets 32 commissioner Roger Goodell 32 Bettis 32 Goodell 31 Bruschi 31 Starks 31 Gaines 31 concussion 31 Stallworth 31 NFLPA 31 collisions 31 Hairston 30 NFL 30 Commissioner Roger Goodell 30 Steve McNair 30 injuries 30 Aiello 30 Joyner 29 ephedra 29 Kearse 29 Seau 29 McNair 29 spinal cord injury 29 dementia 29 neurological 29 McDaniel 29 Dungy 29 Billick 29 Tagliabue 29 Fehr 29 McGahee 28 Cochran 28 helmet 28 Simms 28 trauma 28 ADHD 28 athletic trainer 28 wearing helmet 28 Reaves 28 McClain 28 Dorsey 28 Gandy 28 collective bargaining agreement 27 Barber 27 Doty 27 Faulk 27 CT scans 27 Yarbrough 27 Kubiak 27 McCray 27 Riggins 27 Whisenhunt 27 Pollack 27 Polian 26 Snider 26 Harbaugh 26 Vermeil 26 Dawkins 26 Mays 26 Fraley 26 Ledford 26 neurologist 26 Arrington 26 McNabb 26 Jack Del Rio 26 SIDS 26 eating disorders 26 Woodson 26 Vick 26 infractions 26 heat exhaustion 25 PTSD 25 Diggs 25 Bagwell 25 Rolle 25 Frazier 25 Tatum 25 Bryant 25 Simmons 25 McNeal 25 Grimsley 25 Pitts 25 Cornwell 25 Bledsoe 25 Leftwich 25 Marvin Lewis 25 Lott 25 Sapp 25 Culpepper 25 Goins 25 Pro Bowler 25 Selig 25 sleep apnea 24 McCants 24 Beason