It's not known if it's the surgically-repaired one or not. Jackson went in to be examined by the doctor at about 8 p.m. Jackson, who had been starting all camp at inside linebacker, walked off the field midway through practice very slowly and with his head down. He returned later in the session with a towel around his neck and looking sad.
One-by-one, players came up to express their concern. At one point, it looked like he pointed to his chest. He watched the final 15 minutes of practice from the sidelines, still looking down. Close friends such as Mike Adams talked to him, and he walked off the field with defensive coordinator Rob Ryan.
We'll have more information on Jackson's injury and his status this season as details become available. Jackson was projected to start alongside linebacker Chris Gocong at inside linebacker. Without Jackson, the Browns could still insert one of two veterans -- Eric Barton or David Bowens -- into the starting lineup.
