Anthropologists can learn additional information about individuals and their lives by looking at trauma, diseases or cultural bone modifications. Although these are rare and can vary widely, it is important to be able to recognize them.
A bone trauma is an injury caused by an external force. Blunt force trauma occurs when a force impacts bone over a wide area and sharp force trauma is more narrowly focused. The type of trauma is determined by the instrumentation that caused the damage. Knives or swords are typical examples of instruments that cause sharp force trauma, while a hammer or even a car accident might cause blunt force trauma.
Projectile Trauma
Another type of trauma is projectile trauma. Projectile trauma usually refers to gunshot wounds, but also includes any other projected items such as spears or arrows. The entrance and exit points of a wound can often be identified by evaluating patterns of bone breakage. Entrances generally have fragments of bone pushing to the interior. The exterior hole will be smaller and more defined with the interior being larger and the fragments. By the time the projectile exits (if it does at all) the projectile will have lost velocity and generally makes a larger, less defined exit. Note that there are two types of associated fractures; radiating and concentric. When the projectile impacts the bone, it spurs fractures radiating out from the impact. As the fracture progresses, larger concentric features connect the radiating spikes.
Evaluating Trauma
Identify which type of force trauma is shown in each picture below. Explain your choice of answers.
Answer the questions found in the lab about projectile trauma.