As Paul noted, Toronto Maple Leafs forward David Bolland suffered an, "Erik Karlsson-type injury" that will require surgery during the Maple Leafs-Canucks game on Saturday. The Toronto Star's Dave Feschuk clarified Bolland's status while noting that Bolland was in fact wearing Kevlar socks, but still suffered what is probably a torn Achilles tendon:

Toronto’s biggest loss on Saturday promises to be felt for weeks to come in vital man games. That’s because Leafs centre Dave Bolland, cut in the ankle region by Zack Kassian’s skate in an early-second-period collision, departed Rogers Arena strapped to a stretcher. Carlyle said Bolland had suffered a cut “similar” to the Achilles tendon injury that kept Ottawa Senators all-star Erik Karlsson out of action for most of three months last season. Unlike Karlsson, Bolland had been wearing Kevlar-type socks on Saturday, according to a club source. But the socks are cut-resistant, not cut-proof.

“He will have surgery (on Saturday night),” Carlyle said.

Toronto GM Dave Nonis called the setback “accidental.”

“It would be hard for me to imagine how that was on purpose,” Nonis said. “Hopefully we’re getting (the injury bug) out of the way early. You’d like to think we’ve prepared well, guys were in good shape coming in, and they’ve all been freak injuries. Now we have to deal with ’em. But a lot of teams have to do it so I don’t think we can cry about it.”

Continued, and no level of protection can prevent every injury--those socks can shift, and they can be cut--but it's still better to wear them than not, just as players who wear visors are much less likely to suffer eye injuries.