[A literature review on the Messerer's fracture]

The characteristic wedge-shaped fracture was first described by Messerer (1880) and Bruns (1884) after performing experiments on long bones. Not much later, Messerer (1885) formulated the forensic significance of the direct bending fracture for the detection of the location and direction of blunt impact trauma. He developed the basic biomechanical theory of the origin of this fracture type, which is therefore called Messerer's fracture in the German-speaking world. In the following decades, the findings concerning the origin, specificity and forensic usability of Messerer's fractures were confirmed and supplemented by experiments and case studies. For forensic examinations, it is important to bear in mind that there are exceptions to the rule according to which the level of the wedge-shaped fracture corresponds exactly to the point of impact. The possibility of "false" or "reversed" wedges must also be considered. Already in the 19th century, authors had pointed out the mechanism of indirect formation of wedge-shaped bone fragments. That is why a forensic examination always has to consider the investigation results and medical findings in their entirety. Autopsy of traffic victims is of paramount importance. It must include a thorough examination of clothing, skin, soft tissues and skeletal system using special preparation techniques. The examination of bone injuries in living victims also requires special expertise. If properly applied, valuable results can be obtained by the forensic expert from the wedge-shaped fracture. Until recently, Messerer's fracture was a typical injury sustained by pedestrians hit by vehicles with protruding frontal elements. In modern car production, not only the dimensions of cars have been changed, but the front-end structures have also been modified, e. g. by integrated bumpers. These constructional changes are likely to reduce the frequency of narrow points of impact in collisions. However, further research on the frequency and significance of Messerer's fractures in road traffic accident victims is required.