19-Slides - Breaks

Section 19: Fracture
Mechanics and Breaks
19-1
FIGURE 32-6
19-2
Skeletal injuries may be open or closed.
From: Spotsylvania
19-3
From: Garner
Marieb, 2004
19-4
From: Seeley
Basic Forces Causing Fracture
•
•
•
•
Compression
Tension
Transverse Loading
Torsion
19-5
From: Justice
Tensile Loading
g
19-6
From: Brown
Compression Loading
19-7
From: Brown
Shear Loading
19-8
From: Brown
19-9
From: Al-Tayyar
19-10
From: Al-Tayyar
Fracture Types
•
Fractures are often classified according to the position of the bone
ends after the break:
Open (compound) Î bone ends penetrate the skin.
Closed (simple) Î bone ends don’t penetrate the skin.
Comminuted Îbone fragments into 3 or more pieces
pieces. Common
in the elderly (brittle bones).
Greenstick Îbone breaks incompletely. One side bent, one side
broken. Common in children whose bone contains more collagen
broken
and are less mineralized.
Spiral Î ragged break caused by excessive twisting forces. Sports
injury/Injury of abuse
abuse.
Impacted Î one bone fragment is driven into the medullary space
or spongy bone of another.
19-11
From: Imholtz
19-12
From: Seeley
19-13
From: Imholtz
19-14
From: Seeley
19-15
From: Seeley
What kind of fracture is this?
19-16
It’s kind of tough to tell, but
this
hi is
i a _ _ _ _ _ _ fracture.
f
From: Imholtz