Total guess, but sometimes with things like bone chips in the elbow, you see pitchers try to work through it, and if they can't get comfortable after rehab, they get it scoped out. Hopefully it wasn't anything major, and they thought he might rehab his way out of the injury, but it didn't improve enough.
I thought I'd take IthacaMatt's thinking a bit further and try to explain the procedure he may have had. He's been immobilized with the soft cast so they are being careful.
Just guessing, but this may be what Garrett had in the surgery on an out - patient basis. If he was experiencing range of motion problems, pain from bone spurs and other problems from over use. Only his surgeon knows what he saw when he inserted the scope and had to remove spurs bone fragments or repair.
This will help him in his throwing motion and facilitate a better throw through smoother delivery. The big question is, when will he be allowed to begin rehab and gradually begin to toss the ball.
I believe this will take longer than him coming back by fall practice and finally when he does, he has to get used to throwing with a repaired elbow and it may be that Lamson will be the starter for some time as some have suggested.
When Is Elbow Arthroscopy Recommended?
Injury, overuse, and age-related wear and tear are responsible for most elbow problems. Elbow arthroscopy may relieve painful symptoms of many problems that damage the cartilage surfaces and other soft tissues surrounding the joint. Elbow arthroscopy may also be recommended to remove loose pieces of bone and cartilage, or release scar tissue that is blocking motion.
Common arthroscopic procedures include:
Treatment of tennis elbow (lateral epicondylitis)
Removal of loose bodies (loose cartilage and bone fragments)
Release of scar tissue to improve range of motion
Treatment of osteoarthritis (wear and tear arthritis)
Treatment of rheumatoid arthritis (inflammatory arthritis)
Treatment of osteochondritis dissecans (activity related damage to the capitellum portion of the humerus seen in throwers or gymnasts)
Treatment of fractures
Because patients have varied elbow conditions, complete recovery time is different for everyone.
If you have had a minor repair, you may not need a splint and your range of motion and function may return after a short period of rehabilitation. You may be able to return to work or school within a few days of your procedure.
It takes longer to recover from more complicated procedures. Although the incisions are small in arthroscopy, extensive damage within the joint can be repaired with the procedure.
Full recovery may take several months. Although it can be a slow process, following your surgeon's guidelines and rehabilitation plan is vital to a successful outcome.