ANTH 245 1st Edition Lecture 11Outline of Last Lecture - Principals of BFT that govern damage- BFT to soft tissue- Bone Biomechanics - Stress-Strain CurveOutline of Current Lecture- Long bone fractures- Skull fractures- Head TraumaCurrent LectureForces Acting Upon Bones- Bones are strongest Under Compression- Bones are weakest under tension - Bending is a combination of tension and compressionLong Bone Fractures- Bone is stronger in compression than tension, so will fail in tension first - Can see direction of the forceSkull Fractures - Skull reacts uniquely to trauma- Linear, concentric fractures - Fracture lines do not cross, so can attempt to reconstruct chronology of blows Case Example- Khmer Rouge Killings in Cambodia Head Trauma- When the COD is blunt trauma, the trauma is most often to the head- Head trauma includes:- Blow to the head with a blunt object- When the head strikes an unyielding object- No correlation between presence/absence or severity of skull fractures and severity of brain
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