Editor: Christopher Powers Mechanisms Underlying Patellofemoral Pain: Lessons Learned over the Past 20 Years The Effects of Isolated Hip Abductor and External Rotator Muscle Strengthening on Pain, Health Status, and Hip Strength in Females With Patellofemoral Pain: A Randomized Controlled Trial Management of Patellofemoral Pain Targeting Hip, Pelvis, and Trunk Muscle Function: 2 Case Reports Rehabilitation of the Knee After Medial Patellofemoral Ligament Reconstruction