Fig 6.

The patient is kneeling on the affected knee. (A) A thick, soft cushion is required (dotted red line), in addition to a 2- to 3-step mobile ladder (dotted yellow line) and a straight support surface (dotted blue line) that can be fixed in the desired location, serving as an anterior support; this structure must be approximately 1 m high and 50 cm wide. These items are positioned in front of the x-ray film. The x-ray light bulb is positioned angled perpendicular to the film. (B) The knee to be evaluated must be the one closest to the film, being flexed at 90°, with the thigh fully supported by the aforementioned straight support surface. The contralateral limb must be inclined posteriorly with partial proprioceptive load on the ground, aiming to leave the entire body weight on the knee to be examined. Red arrow indicates that the patient must let the body weight fall on the flexed member. (C, D) The patient must lean his or her body 10° toward the examined side, with the aim of the condyles being superimposed in the image examination. In panel D, the red arrow shows that the patient must lean sideways by about 10° to the affected side.