Fig. 1From: A 6-week hip muscle strengthening and lumbopelvic-hip core stabilization program to improve pain, function, and quality of life in persons with patellofemoral osteoarthritis: a feasibility pilot studyPeak isometric muscle torque testing positions. a–d The positions of participants during testing. a Hip abductor test position. b Hip extensor test position. c Hip external rotator test position. d Knee extensor test positionBack to article page