So what do they do during a Tommy John surgery?

那么他们在汤米·约翰手术中会做什么呢？

This is your ulna right here and this is your radius and what happens in people that require Tommy John surgery is they end up having a rupture of this tendon called the ulnar collateral ligament.

这是你的尺骨，这是你的桡骨，需要汤米·约翰手术的人是因为发生了肌腱断裂，称为尺骨侧副韧带。