UCL Reconstruction Keeps Hadley Competing sewardsk3 Tue, 05/26/2026 - 13:53 Dr. Joseph Yellin and CHOP provided a key second opinion to Hadley. A year after injuring her left ulnar collateral ligament (UCL) falling on the uneven bars, Hadley doesn’t remember thinking much after she landed – at least beyond asking her coach to hold her uninjured hand.