The literature dealing with the diagnosis and treatment of cervical spine injuries is considerable. Absent, however, are comprehensive criteria or guidelines for permitting or prohibiting return to contact activities. The purpose of this report is to describe congenital, developmental, as well as posttraumatic conditions of the cervical spine as presenting either (a) no contraindication, (b) relative contraindication, or (c) an absolute contraindication to continued participation. In addition to reviewing the relevant concepts of Bailes, Watkins, and White, a comprehensive set of guidelines is presented. In addition, “spear tackler's spine,” an absolute contraindication to participation, is described. Also, recommendations for managing individuals following cervical spine fusion are suggested.