"Tommy John" have become the most dreaded words in ... The surgery replaces the existing UCL with a graft from a hamstring tendon, the Palmaris tendon, or a cadaver. The new tendon is attached ...

During Tommy John surgery, the UCL is reconstructed using other tissue from the body. Most commonly, the palmaris longus tendon, which is located in the forearm, is harvested via small incisions.

Now 29, Ohtani had Tommy John surgery on Oct. 1 ... Doctors prefer to replace the torn ligament with an almaris longus tendon from the forearm. If that isn’t available, a gracilus tendon ...