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. 2020 Sep 12;11(6):1031–1038. doi: 10.1016/j.jcot.2020.08.027

Fig. 4.

Fig. 4

AP right hip radiograph. A lateral compressive force applied to the greater trochanter with the hip in slight abduction and external rotation displaces the acetabulum columns medially. The femoral head acts as a hammer, directly striking on the anterior medial wall of the acetabulum and quadrilateral plate.