The decline step-down test measuring the maximum pain-free flexion angle: A reliable and valid performance test in patients with patellofemoral painMartin Ophey, Igor Tak, Robert B. Berg et al.|Physical Therapy in Sport|2018Cited by 16
Short-term effectiveness of an intervention targeting lower limb range of motion on pain and disability in patellofemoral pain patients: A randomized, non-concurrent multiple-baseline studyMartin Ophey, Igor Tak, Gwen A.H.M. Crooijmans et al.|Journal of Bodywork and Movement Therapies|2020Cited by 9