ABFM ABFM Forensic Anthropology & Identification 3 — Questions and Answers
Question 1: In forensic anthropology, what distinguishes perimortem trauma from postmortem trauma on bone?
- Color difference — perimortem bone is always darker
- Perimortem bone shows green-stick fractures and plastic deformation; postmortem is dry and jagged (Correct answer)
- Postmortem fractures are always smaller than perimortem fractures
- The depth of cut marks is consistent in perimortem trauma only
Correct answer: Perimortem bone shows green-stick fractures and plastic deformation; postmortem is dry and jagged
Perimortem bone retains moisture and shows plastic deformation (green-stick fractures), while postmortem dry bone fractures are sharp and irregular.
Question 2: Sharp force trauma to bone in a forensic context is identified by which characteristic feature?
- Circular penetrating defect with beveling
- Concentric fracture lines radiating from impact point
- Smooth-walled incised cuts with internal striations (Correct answer)
- Spiral fracture pattern along the diaphysis
Correct answer: Smooth-walled incised cuts with internal striations
Sharp force trauma produces smooth-walled cuts with internal striations (kerf marks) caused by the blade edge passing through the cortical bone.
Question 3: What type of skeletal fracture pattern is most associated with blunt force trauma?
- Butterfly fracture with flap displacement
- Concentric and radiating fracture lines at the impact site (Correct answer)
- Kerf-walled incised defect at entry
- Smooth, beveled oval perforation
Correct answer: Concentric and radiating fracture lines at the impact site
Blunt force trauma typically produces concentric ring fractures surrounding the impact point with radiating fracture lines extending outward.
Question 4: A gunshot wound entry on a flat cranial bone typically shows which characteristic feature?
- Beveling on the inner (endocranial) table (Correct answer)
- Beveling on the outer (ectocranial) table
- Equal beveling on both inner and outer tables
- No beveling — entry shows a clean oval hole
Correct answer: Beveling on the inner (endocranial) table
Gunshot entry wounds on the skull typically show internal (endocranial) beveling as the projectile forces bone inward through the inner table.
Question 5: Which technique is used in forensic anthropology to document and analyze patterns of bone trauma for court presentation?
- Bone density scanning with dual X-ray absorptiometry
- Macroscopic and microscopic analysis with photographic documentation (Correct answer)
- Partial DNA extraction from cortical bone powder
- Thermal alteration assessment via spectroscopy
Correct answer: Macroscopic and microscopic analysis with photographic documentation
Macroscopic and microscopic analysis combined with systematic photographic documentation is the standard method for trauma analysis and courtroom evidence.
Question 6: When burned skeletal remains are submitted for analysis, what primary challenge does the forensic anthropologist face?
- Burned bones cannot yield DNA under any circumstances
- Color of bones after burning indicates cause of death
- Fragmentation and shrinkage complicate measurement and identification (Correct answer)
- Teeth are destroyed by heat before bones show any change
Correct answer: Fragmentation and shrinkage complicate measurement and identification
Heat causes bone shrinkage, warping, and extreme fragmentation, making standard measurements and biological profile estimation unreliable or impossible.
ABFM ABFM Forensic Anthropology & Identification 3
In forensic anthropology, what distinguishes perimortem trauma from postmortem trauma on bone?