#2. Dean Ambrose - High-Grade Triceps Tendon - 2017
Dean Ambrose was the latest Shield member to suffer an injury just as the Shield had reunited for the second time, meaning that his arm injury couldn't have come at a worse time for 'The Hounds of Justice' who had just welcomed Roman Reigns back from a viral illness.
WWE reported on Ambrose's injury following a kayfabe attack from Samoa Joe backstage. In fact, it's unclear when exactly Ambrose's injury did occur. It was then revealed to be a high-grade triceps tendon injury, possibly a tear, meaning that Ambrose would require surgery and would be out for nine months.