Previous research has described the types of injuries suffered by belted occupants of vehicles involved in rollover crashes. There has been much debate concerning these injuries, in particular the head, spine and thoracic injuries. Since rollovers may result in complex occupant kinematics, this paper analyzed extensive crash field and descriptive injury data from 55 belted occupants involved in 51 rollover crashes taken from the Crash Injury Research Engineering Network (CIREN) database. The paper discusses a methodology to deduce specific body region injury mechanisms of occupants in rollover crashes selected for crash as well as occupant characteristics.