The decline step-down test measuring the maximum pain-free flexion angle: A reliable and valid performance test in patients with patellofemoral pain von Ophey, Martin J., Bosch, Karlijn, Khalfallah, Fatos Z., Wijnands, Ap M.M.P., van den Berg, Robert B., Bernards, Nol T.M., Kerkhoffs, Gino M.M.J., Tak, Igor J.R.

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