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(A) The patient is placed in the supine position with the x-ray ampule angled at about 20° cephalic. Red rectangle shows a zoom of the degree of the angulation of the x-ray ampule. Red arrow simulates the direction of the x-ray. (B) The knee is flexed at 20°. To obtain this flexion, we place a radiotransparent cushion posterior to the knee. (C) The cushion should be approximately 10 cm height (red line).
