where did you read about him having a fracture? From what i've read this is a birth defect of his bone not fusing together while developing as a child, and it might not even be the cause of his pain.
The surgery included placing inserting screws into the infielder's shoulder to stabilize an extra bone in his shoulder, due to a condition known as Os Acromiale - non-union of the acromion bone. According to the to the team, the pre-existing condition did not contribute to the inflammation experienced this season.
The acromion is the most prominent bone on the top of your shoulder. You can feel it easily. The acromion developes as four separate parts during childhood. These have all joined together (fuse) by the age of 25 years in most people. However, in 8% of people one or more of the parts do not fuse.