Borland, the 49ers' third-round pick last year, is calling it quits because of safety issues in the league, as he's concerned about the long-term effects of head trauma. "I just honestly want to do what's best for my health," Borland said. "From what I've researched and what I've experienced, I don't think it's worth the risk." Borland has been diagnosed with two concussions in his lifetime, but may have suffered others. He took over as a full-time starter in Week 7 as a rookie and racked up 107 tackles, two interceptions, and a sack while grading out as PFF's No. 4 inside linebacker. His and Patrick Willis' retirements put the 49ers in a severe bind at the position.
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