DeGrom's injury is a pinched ulnar nerve in his right elbow, which will require surgery, sidelining him for three months, Newsday reports. A determination as to when he will have the operation has not yet been made, as there is the slim chance he may pitch if the Mets advance far in the playoffs.
The procedure will remove scar tissue that has developed around and is pinching the nerve. It's a somewhat common situation following Tommy John surgery, which deGrom underwent in October 2010. DeGrom won't injure the arm additionally by pitching, as an MRI showed no damage to the ligament. Still, the uncertainty and possibility of a flare-up likely will result in the operation happening sooner rather than later.