1. From the Department of Radiology and Center for Magnetic Resonance Research (J.E., C.P.J., L.W.) and Department of Orthopaedic Surgery (J.A.M., B.J.N.), University of Minnesota Medical Center, 2021 6th St SE, Minneapolis, MN 55455; and Complex Knee and Sports Medicine Surgery, The Steadman Clinic and Steadman Philippon Research Institute, Vail, Colo (R.F.L.).