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Fig. 8A —Diagrams show proposed mechanism of injury for Chance-type
fractures. White arrow shows point of contact of seat belt and abdomen, and
straight black arrows depict forces. Black circle represents axis of rotation.
Representative segment of lumbar spine is illustrated in abdomen restrained by
seat belt. On sudden deceleration, point of contact of seat belt and abdomen
serves as fulcrum, or axis of rotation, about which all structures posterior
are subject to flexion and distractive forces.
