Keenan Allen's left knee was a bother.

It forced him to miss his final three games in 2012, sidelined him at the NFL Combine, slowed him on his pro day, and, somewhere along the way, could have contributed to his fall in the draft.

On Friday, it was all behind him.

The Chargers wide receiver ran every drill in a morning practice at rookie minicamp, and he reported no worse for the wear. The participation comes after suffering a torn posterior cruciate ligament in October.