Diffuse Loading
Definition
Force distributed over a broad contact area (as from a fall onto a flat surface or a broad-surface blow); produces a broader fracture pattern without a clear focal epicentre, often with eggshell outer-table cracking.
- Force distribution
- Spread over a broad contact area
- Example causes
- Fall onto a flat surface, broad-surface blow
- Fracture pattern
- Broader, without a clear focal epicentre
- Associated feature
- Eggshell outer-table cracking
Common questions
How does diffuse loading help distinguish a fall from a targeted blow?+
A fall onto a flat surface spreads impact force broadly, producing a fracture pattern without one obvious point of maximum force, whereas a blow from a narrow object such as a rod or hammer concentrates force at a small contact point, creating a more focal, depressed fracture pattern that a pathologist can use to differentiate the mechanism.
What does eggshell outer-table cracking indicate under diffuse loading?+
Eggshell cracking refers to a fine, radiating fracture pattern on the outer skull table resembling a cracked eggshell, and its presence under diffuse loading reflects the skull bending broadly under a wide-area force rather than shattering locally under a concentrated point of impact.
Related terms
- Bearing Surface
- The area of the striking implement that was in contact with the skull at the moment of force transfer; its geometry can...
- Concentric Fracture
- An arc-shaped fracture encircling the impact zone, produced by outer-table bending tension at a distance from the focal impact; always post-dates the...
- Depressed Fracture
- A fracture where the impacted skull segment is driven inward beyond the elastic limit; the geometry of the depression reflects the bearing...
- Focal Loading
- Force concentrated on a small contact area of the skull surface (as from a hammerhead, poker, or stone edge); produces a discrete...
- Hering's Principle
- The 1853 observation that a radiating fracture from a subsequent impact is arrested when it reaches a fracture line produced by a...
- Perimortem Fracture
- A fracture produced at or near the time of death while the bone retains green (fleshed) properties; distinguished by sharp fracture margins...
- Radiating Fracture
- A linear fracture extending outward from the impact point, initiated by inner-table tension as the outer table is compressed; propagates until arrested...
- Wedge Fracture
- The three-dimensional fracture geometry described by Berryman and Symes (1998): a conical inner-table failure zone wider than the outer-table defect, produced by...
- Wolff's Law
- The principle that bone is deposited and resorbed in response to mechanical loading history. Cortical thickness and trabecular orientation follow principal stress...