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Fig. 3 —Clinical tests to assess femoroacetabular impingement. Anterior impingement sign (left) is positive, with painful forced internal rotation in 90° of flexion. In extreme forms, there is unavoidable passive external rotation of hip during hip flexion ("Drehmann's" sign, center). "Posterior impingement" sign is positive when there is painful forced external rotation in maximal extension (right).