Birmingham mandible and midface rules: determining variables for inclusion in a clinical predictor rule.

Staff in emergency departments often rely on heuristics and algorithms to make clinical decisions on a wide range of problems. Clinical predictor rules such as the Ottawa ankle rules serve to reduce the need for unnecessary radiographs and help to give frontline staff the confidence to make a diagnosis. The current study aimed to achieve consensus on the variables to test for inclusion in a set of predictor rules for suspected fractures of the mandible and midface. A three-stage modified Delphi study was conducted of members and fellows of the British Association of Oral and Maxillofacial Surgeons (BAOMS). At the third stage, there was agreement of more than 51% to retain 11/35 of the suggested predictors for mandibular fractures and 14/28 of the midface predictors. To develop and validate clinical predictor rules for use by frontline staff, these variables will now form part of a prospective data gathering exercise at a major trauma centre.