Imhäuser G
Z Orthop Ihre Grenzgeb. 1982 Apr;120(2):93-9. doi: 10.1055/s-2008-1051584.
X-rays of the hip joints in anteroposterior direction in adults and children should be made with the leg in the middle rotation position. But the middle position is different in children than in adults. In adults the patella should be facing directly upwards because from this position the leg can be rotated medially. In children of 3 to 8 years (or older), however, the leg can be rotated much further medially than it can be laterally. Thus in children the "middle rotation" position is one in which the leg is positioned more medially than would be the case with adults; the ideal position for X-ray is the one in which the leg can be rotated to the same extend medially and laterally. X-rays must be performed in this manner to prevent errors in judging children's hip joints. Examples of wrong diagnosis on the basis of conventional X-rays are demonstrated. Only with X-rays in the correct middle position can we arrive at reliable assessments of the hip.U
成人和儿童髋关节前后位X线片应在腿部处于中间旋转位置时拍摄。但儿童的中间位置与成人不同。在成人中，髌骨应直接朝上，因为从这个位置腿部可以向内旋转。然而，在3至8岁（或更大）的儿童中，腿部向内旋转的程度比向外旋转的程度要大得多。因此，在儿童中，“中间旋转”位置是指腿部比成人更偏向内侧的位置；X线检查的理想位置是腿部向内和向外旋转程度相同的位置。必须以这种方式进行X线检查，以防止对儿童髋关节判断出现错误。文中展示了基于传统X线片的错误诊断示例。只有在正确的中间位置进行X线检查，我们才能对髋关节做出可靠的评估。
