Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. population data to all hospitalizations among active duty Army soldiers. Results: We found the following frequencies for specific mandible fracture locations: angle 35.6%, symphysis 20.1%, subcondylar 14.2%, body 12.7%, condylar process 9.1%, ramus 4.5%, alveolar border 2.7%, and coronoid process 1%. The mechanisms of injury were separated into seven categories. Fighting accounted for 36.2%, automobile accidents for 18.6%, athletics for 13.6%, falls for 9.7%, motorcycle accidents for 3.1%, other land transport accidents for 3% and miscellaneous causes for 15.8%. A fewfracture locations appeared to be associated with specific mechanisms. Of 82 alveolar border fractures with known mechanisms, 37% resulted from automobile accidents. Of 1,094 angle fractures with known mechanisms, 48.6% resulted from fighting. Our data show that the vast majority of fractures were isolated to one location. 3,593 (82%) have only one fracture recorded, 764 (17%) have two fractures recorded, 21 (.4%) have three fractures recorded, and 3 (< 0.1%) have four fractures recorded. Associated injuries were rather common and included facial lacerations 1,236 (36.2%), non-mandible facial bone fractures 733 (16.7%), intracranial injury 402 (9.2%), internal injuries 229 (5.2%), fractures of the upper limb 295 (6.7%), fractures of the lower extremity 302 (6.9%), and cervical fractures 26 (0.6%).
