My sixteen year old son just had shoulder surgery two weeks ago to repair his SLAP II Lesion Labrum Tear. His doctor is Ted Schlagel of the Denver Steadman Hawkins Clinic here in Denver. They are the Orthopedic Surgeons for the Broncos and Rockies and are the best in this Region.
He tore his labrum last Spring, rehabed it all last Summer and Fall, pitched this Spring and hurt it again the last game of the Spring Season.
Surgery was his only option if he wanted to continue to pitch. They drilled three acnhors into the bone behind the labrum and then sutured the labrum to the anchors. His rehab and recovery time will be between 6-9 months. So far he is doing very well and is a bit ahead of schedule. The success rate for this type of surgeries on pitchers is around 85%.
Do a GOOGLE on SLAP II Leasions and you will pull up several articles that can explain it in more detail than I can. The orthopedic Surgeon can only be sure it is a SLAP tear once an MRI is done. Basically it is a tear of the labrum, most commonly where the biceps tendon attaches to the labrum. If you want to be sure of what is going on be adamant about getting an MRI or else you will spends months or years trying rehab and guessing what is going on in there.
Good luck and I would be happy to answer any further questions you may have.