The topic is sports injuries.

A Geelong player is not playing due to a concussion issue.

A document about concussion has caused a big problem.

There are ethical issues and conflicts of interest in this case.

This incident shows the need to think about contact sports.

Playing contact sports can lead to brain injuries and pain.

A researcher found that longer sports careers increase the risk of brain trauma.

The researcher was surprised by his findings.

He said 'holy f***' a lot when he saw the results.

As he looked at more data, he saw a range of damage to players.

He thinks this will happen to all players who play for a long time.

Professor Alan Pearce is a leading researcher on concussions.

Some players had minor damage, while others had more serious problems.

Professor Pearce asked how we can accept some damage to players.

He and his team studied 113 retired players and found a link between career length and brain damage.

The length of a player's total career, not just their professional career, is the problem.

Consider a player who starts at 10 and plays for 35 years.

The damage is not just from big concussions, but from many small knocks.

What does this mean for professional contact sports?

When players sign a contract, they may be signing up for future brain damage.

There are many risks in playing professional sports, including injuries and chronic pain.

This is the price players pay, but is it worth it?

Professor Pearce said professional sport is extreme and goes beyond healthy living.

The AFL and other codes must think about how to run a sport with a risk of brain damage.

Acknowledging the risk is important.

A document signed by a player has raised questions about risk and responsibility.

The document said the player took on the risk of injury, including concussion.

There may be problems with what happened, but acknowledging risk is not a bad idea.

Kolodjashnij signed a concussion waiver with his team in 2024.

When people have surgery, they sign a consent form to show they understand the risks.

This form does not mean the surgeon is not responsible if something goes wrong.

The idea is that people know the risks before they have surgery.

Maybe players should sign a consent form when they start playing professional sports.

Professor Pearce thinks this is a good idea, not to avoid responsibility, but for ethical reasons.

He wants players to know everything upfront.

It's also about risks like ACL injuries and psychological stress.

The AFL has rules to protect players, but there is no explicit consent form.

Some people think the AFL's education on concussion is enough, so a consent form is not needed.

Professor Pearce said the AFL should do all it can to minimize the risk of concussion.

He suggested using smart mouthguards and limiting contact training.

The AFL is considering limiting contact training from next year.

The bigger picture is about the risk of brain damage in contact sports.

Consent would not stop players from suing if they are treated negligently.

A class action against the AFL will hear arguments about brain damage next year.

Around 120 former players are suing the AFL and 11 clubs.

This is a big risk for the AFL and all contact sports.

One player claimed he suffered 20-30 concussions and has life-altering injuries.

More players have joined the class action.

The writ argues that the AFL and clubs failed in their duty of care to protect players.

A lawyer said the AFL should have taken precautions based on medical evidence.

While some think education is key, others do not believe a consent form is the answer.

A law professor said the risk should not be placed on players.

The risk should lie with the AFL to make the game as safe as possible.

See more ABC coverage of sports.

Analysis by Nick Campton.

Related stories about the AFL.

Topics related to the AFL.

The AFL is considering changes to protect players.

The issue of brain damage in contact sports is complex.

Players and the AFL must work together to find a solution.

The AFL must prioritize player safety.

This is an important issue that affects many people.

The AFL and players must take responsibility for their actions.

The issue of brain damage is not just about the AFL, but all contact sports.

Players must be aware of the risks and take steps to protect themselves.

The AFL and players must work together to create a safer game.

This is a difficult issue, but it must be addressed.

The AFL and players must find a way to balance the risks and benefits of the game.

The issue of brain damage is not just about the players, but also the fans.

The AFL and players must consider the long-term effects of the game.

The AFL must take a proactive approach to protecting players.

Players must be educated about the risks and how to protect themselves.

The AFL and players must work together to create a culture of safety.

This is an important issue that requires a collective effort to solve.

The AFL and players must prioritize player safety above all else.

The issue of brain damage is a complex one that requires a thoughtful approach.

The AFL and players must be willing to make changes to protect players.

The AFL must be transparent about the risks and benefits of the game.

Players must be given the opportunity to make informed decisions about their participation.

The AFL and players must work together to create a safe and healthy game.

This is an ongoing issue that requires continuous attention and effort.

The AFL and players must be committed to finding a solution.

The issue of brain damage is not just about the AFL, but all sports.

The AFL and players must be leaders in promoting player safety.

The AFL must set an example for other sports to follow.

Players must be empowered to take control of their own safety.

The AFL and players must work together to create a positive and safe culture.

This is an important issue that requires a collective effort to solve.

The AFL and players must prioritize player safety and well-being.

The issue of brain damage is a complex one that requires a thoughtful and proactive approach.

The AFL and players must be willing to make changes to protect players.

The AFL must be transparent about the risks and benefits of the game.

Players must be given the opportunity to make informed decisions about their participation.

The AFL and players must work together to create a safe and healthy game.

This is an ongoing issue that requires continuous attention and effort.

The AFL and players must be committed to finding a solution.

The issue of brain damage is not just about the AFL, but all sports.

The AFL and players must be leaders in promoting player safety.

The AFL must set an example for other sports to follow.

Players must be empowered to take control of their own safety.

The AFL and players must work together to create a positive and safe culture.