Fig. 1. Two-thumbs encircling-hands chest compression.
Fig. 2. Mechanism of posterior rib fracture. Anterior–posterior compression of the rib cage leads to leverage of posterior ribs over the vertebral transverse
process, which causes tension in the inner aspect of the rib head or neck, resulting in fractures (black arrows). Fractures caused by compression can also
occur at other sites of the rib (red marks) (according to Kleinman, 2005). (For interpretation of the references to color in this figure legend, the reader is
referred to the web version of the article.)