Abstract
Various kinds of axial roentgenography of the sacroiliac articulation known as far are still inadequate in order to measure sacroiliac space. Patients were so settled in sitting position that their backs kept 50 degrees to the leaning stand, with their hades backward and their abdomen forward, in order to keep the films vertical to the sacroiliac articulation axis, to which direction X-rays were projected. The roentgenography with this projection not only satisfied the aim of measurement but also made clear feature of the sacroiliac axis and was considered to be of diagnostic value.
