SF's Borland Quits Over Safety Issues

49ers Rookie Chris Borland Quits Over Head Trauma Safety Concerns
FILE - In this Nov. 16, 2014, file photo, San Francisco 49ers inside linebacker Chris Borland (50) celebrates after intercepting a pass during the first half of an NFL football game against the New York Giants in East Rutherford, N.J. Across the NFL, while many superstars are doing their thing, a wide range of obscure players are having a major impact. Not just on the offensive line, where anonymity is a given, but even at high-profile positions such as linebacker and running back. Step up and take a bow Justin Forsett, Chris Borland and Connor Barwin. (AP Photo/Bill Kostroun, File)
FILE - In this Nov. 16, 2014, file photo, San Francisco 49ers inside linebacker Chris Borland (50) celebrates after intercepting a pass during the first half of an NFL football game against the New York Giants in East Rutherford, N.J. Across the NFL, while many superstars are doing their thing, a wide range of obscure players are having a major impact. Not just on the offensive line, where anonymity is a given, but even at high-profile positions such as linebacker and running back. Step up and take a bow Justin Forsett, Chris Borland and Connor Barwin. (AP Photo/Bill Kostroun, File)

BERKELEY, Calif. -- San Francisco 49ers linebacker Chris Borland, one of the NFL's top rookies last season, told "Outside the Lines" on Monday that he is retiring because of concerns about the long-term effects of repetitive head trauma.

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