Concussion is now a powder-keg issue in world sport, as concerns deepen about the potential links to brain disease.
The long-term effects of careers spent making and taking heavy tackles are being revealed in ever-increasing detail, but the risks are not exclusive to so-called full contact sports.
Some governing bodies have sprung into action, implementing new rules and safety measures. But others turn a blind eye.
So, we’re asking – how will the concussion issue affect the future of sport?
Presenter: Paul Connolly
Producer: Stefania Okereke
(Photo: Denver Broncos wide receiver Wes Welker (83) lays on the field after getting a concussion in the second quarter. Credit: Getty Images)