Yes, it was the OATS procedure. His lesion was approx 1.5 cm X 1.7 cm. There was basically a "pit" in his elbow that was removed. Usually only cartilage is taken out of knee, but because it was so bad, bone had to also be taken. Needless to say, his elbow was a mess! My son had not pitched alot in the last year. (since Middle school anyways) But, he did admit after the surgery that his elbow had been bothering him a few months prior to him telling us. I guess it was like a dull ache, everytime he threw the ball. But just not bothering him enough to say anything. He was playing with a 16 yr old team, and he was only 14, and doing good, and he wanted to play. His passion for baseball is beyond measure, so he just kept going. Unfortunately this is the outcome. Trying to stay positive, and he is determined to come back stronger than before, so that is great! We are getting pics on Friday with exact measurements of lesion, ect. Thanks for the reply!