Breakout star rookie linebacker Chris Borland has retired out of concerns for his neurological health:

San Francisco 49ers linebacker Chris Borland, one of the NFL’s top rookies this past season, told “Outside the Lines” on Monday that he is retiring because of concerns about the long-term effects of repetitive head trauma.

Borland, 24, said he notified the 49ers on Friday. He said he made his decision after consulting with family members, concussion researchers, friends and current and former teammates, as well as studying what is known about the relationship between football and neurodegenerative disease.

“I just honestly want to do what’s best for my health,” Borland told “Outside the Lines.” “From what I’ve researched and what I’ve experienced, I don’t think it’s worth the risk.”

Borland becomes the most prominent NFL player to leave the game in his prime because of concerns about brain injuries. More than 70 former players have been diagnosed with progressive neurological disease after their deaths, and numerous studies have shown connections between the repetitive head trauma associated with football, brain damage and issues such as depression and memory loss.

“I feel largely the same, as sharp as I’ve ever been. For me, it’s wanting to be proactive,” Borland said. “I’m concerned that if you wait ’til you have symptoms, it’s too late. … There are a lot of unknowns. I can’t claim that X will happen. I just want to live a long, healthy life, and I don’t want to have any neurological diseases or die younger than I would otherwise.”

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Borland was expected to be a key part of the 49ers’ defense this season, after the retirement of All-Pro linebacker Patrick Willis last week. Borland replaced Willis, 30, after six games last season; Willis had sustained a toe injury.

Willis’ retirement had no role in his decision, Borland said.

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Borland, who is listed at 5-foot-11, 248 pounds, earned accolades for his aggressiveness and instincts at inside linebacker. He had 107 tackles and a sack in 14 games, eight of them starts. He was the NFC’s defensive player of the week for his performance against the New York Giants in Week 11. He led the 49ers with 13 tackles in that game and became the team’s first rookie linebacker with two interceptions in one game. He received one vote for NFL defensive rookie of the year.

His success this past season did not make his decision more difficult, Borland said: “I’ve thought about what I could accomplish in football, but for me, personally, when you read about Mike Webster and Dave Duerson and Ray Easterling, you read all these stories, and to be the type of player I want to be in football, I think I’d have to take on some risks that, as a person, I don’t want to take on.”

Borland was referring to former NFL greats who were diagnosed with the devastating brain disease chronic traumatic encephalopathy, or CTE, after their deaths. Duerson and Easterling committed suicide.

This guy has one season in the NFL, and he was arguably on a path to a multimillion dollar pay day, and he decided that it was not worth dementia in his late 40s.

You gotta figure that the current generation of teenage jocks, and their parents, are becoming less likely to take up football, and news like this will make them less likely.

The pipeline of new players has to be drying up a bit.

I’m not sure what the solution is to the CTE problem in the NFL, or if there is a solution, but a good start would be accelerometers in helmets and set them at an appropriate level (not sure of the level, I’m an engineer, not a doctor, dammit!^*).

Once the sensor trips, the player gets a mandatory few weeks off on injured reserves and treatment.

^*I LOVE IT when I get to go all Doctor McCoy!!!