It's actually part of a strange and ugly run of knee injuries we've had of late.
That's 6 *major* (multi-month) knee injuries in the last 6 games, counting pre and post season.
5 ACL/MCLs to starters (Mendenhall, Hampton, LT Max Starks, FB Johnson, DeCastro), plus the season-ender to Spence last night. That doesn't include significant (i.e. multi-week) knee injuries to Harrison and two key reserves (Sylvestor, C. Brown) over the past 4 preseason games.
I guess injuries are a bit like turnovers--they come in bunches, and there's never any rhyme or reason to it.
Really a shame for the young rookie Spence; his game is built on unusual speed and quickness, and you wonder if a guy like that can be effective even after his rehab. That was just a brutal-looking injury, almost Theisman-esque in how the leg bent backward so far.