Former Philadelphia Eagles QB Jim McMahon is one of eight people who have filed a lawsuit in Philadelphia against the NFL over concussion related injuries.
McMahon, who twice won the Super Bowl, has been vocal about his mental health problems caused by concussions. He claims to have played through at five of them and now suffers problems including short term memory loss.
The lawsuit itself is against the NFL for their handling of injuries related to concussions for these players, including training people to initiate contact with their head, poor medical treatment and for deliberately withholding information that linked brain injuries to football.
The NFL have said they will contest the lawsuit vigorously but had not yet seen the details.
One of the plaintiffs in the case, Wayne Radloff was an offensive lineman in the late 1980s for Atlanta and Miami. Now 50 he suffers from dementia and Chronic Traumatic Encephalopathy, a degenerative brain disease caused by concussions and multiple head injuries.
CTE has been linked to many deaths in recent years in football, ice hockey, wrestling and boxing. At present it is only definitively diagnosed via autopsy but there are procedures to diagnose it whilst alive.
The Radloff family are looking to use this as a way to help other families affected in the sporting world.
Since 2009, the NFL has made many changes to prevent head contact injuries and is also working with medical professionals to help research into CTE and its effects.