ANT 3520 Lecture Notes - Lecture 7: Blunt Trauma, Spiral Fracture, Trauma Ii
17 Feb 2016
School
Department
Course
Professor
Document Summary
Trauma ii: bones fracture in predictable ways based on their shape, impacts to the shaft of a tubular bone (long bone, metacarpals, metatarsals) Compression at impact site (forces going towards itself) Tension on opposite side (forces going away from themselves: bone fails in tension before compression, common forces that may result in failure. Compression: bending stress can produce partial fractures. Bone fails in tension; break fails to transect the bone. Common in juveniles (higher percentage of cartilage and collagen in bones: simple fractures- break a bone into two distinct segments. Occur when force is applied perpendicular to the long axis of the bone. Common with falls: comminuted fractures- produce additional bone fragments at break. Often due to compression along the bone"s long axis. Butterfly fracture- break forms a triangle: compound fractures- bone pierces the skin, spiral fracture- results from twisting forces that travel obliquely through the bone. Causes a large callus area; bone knit back together neatly: boxer"s fracture.
