From Tomase's piece in today's Herald:
"According to former Red Sox team doctor Bill Morgan, shoulder blade injuries can take anywhere from two to 12 weeks to heal, depending on the location of the break. The bone, also known as the scapula, connects the humerus (upper arm bone) to the collar bone.
?For what he does, it?s tough because he?s going to have to be able to get his arms over his head, lift his shoulder pads and absorb contact,? said Morgan, who spoke of the injury in general terms and has not examined Harrison. ?If it was a large fracture through the entire bone, those are tough to heal. It is a vascular bone, so it heals well. But if it?s more than an avulsion fracture, it?s got to heal before anything.?
An avulsion fracture would be the best-case scenario. That?s where a tendon or ligament pulls away a small piece of bone. They?re common in the ankle and often treated as a sprain. Such fractures can take as little as two weeks to heal.
The worst-case scenario would be a break that extends into the shoulder joint, which would require surgery and likely end his season. Word last night was that the injury was not that serious.
The most common course would be 4-6 weeks of healing, followed by another 3-6 weeks to regain range of motion. Given Harrison?s experience coming back from injuries, he could beat both of those timetables."
http://patriots.bostonherald.com/patriots/view.bg?articleid=166257