Nathan Horton is dealing with a chronic shoulder dislocation, a source with direct knowledge of the situation tells WEEI radio. Horton is officially day-to-day with an undisclosed injury, but it certainly looked like a shoulder injury when it happened. According to WEEI, the injury happened when Horton fought Jarome Iginla on April 20 and he's been undergoing treatment for it ever since. If this is true, the injury can be extremely painful and the shoulder is subject to dislocating at a moment's notice. Since he's played with it all postseason, we doubt the shoulder will keep Horton out of the Stanley Cup final, but we won't know anything official until Saturday's morning skate most likely.