The bone spur is causing fraying to his rotator cuff and labrum and needs to be removed before he can fully recover.
Halladay was set to visit Dr. Lewis Yocum to address shoulder inflammation that has reportedly been bothering him since April 25. After visiting the doctors, he believes he has a partial tear of the rotator cuff.
There is no timetable yet for the surgery, but when the "scope and cleanup" (his differentiation) occurs the doctors will be looking for and attempting to clean up the bone spur, labrum, and rotator cuff.
Halladay believes he should be able to return this season and thinks the procedure will improve his command over pitch location. He gave up 17 combined runs over his past two starts and is 2-4 on the season with an un-Doc-like 8.65 ERA.
The Phillies officially placed him on the disabled list Monday.