Fig. 1.

Open scissors syndrome. Left: An example of impaired lumbar spine stabilization. The red lines represent the plane of the chest (diaphragm) and pelvis (with their incorrect positions), and lordotization of the lumbar spine in the so-called “open scissors syndrome.” The yellow circles indicate a loss of abdominal muscle function. The black lines represent a defect in the position of the lower ribs. Right: Schematic representation of the ideal and disturbed positions of the planes of the chest, pelvis, and lumbar spine. a Ideal position, with the planes of the diaphragm and pelvis placed horizontally above each other; b instability of the lumbar spine, with incorrect position of individual body segments corresponding to open scissor posture (reprinted with permission of Petr Bitnar)