[Köhler's "tear drop". Relationship between the radiologic picture and anatomic substrate].

The diagnostic value and anatomical basis of Köhler's "tear drop" has been in doubt. By means of radiographs of the right side of the pelvis taken with various degrees of rotation tilt, and by X-raying serial sections, it was possible to demonstrate how this appearance is produced. It was shown which parts of the pelvis contribute to the "tear drop". This simplifies an understanding of the radiographic appearances of the pelvis in the region of the hip joint.