Bone Academia
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Transcript of Bone Academia
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Bones are characterized anatomically as:
lon bones e. . humerus femur
flat bones (e.g. sternum and ribs )
. .
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generally classified into two types:
ort ca compact
trabecular (cancellous, spongy)
of porosity and the unit microstructure.
Trabecular bone contributes about 20% of theo a s e e a mass w n e o y w ecortical bone contributes the remaining 80%.
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COMPACT, CORTICAL,
LAMELLAR BONE: Bone arranged in
concentric layerscalled lamellae ,with Haversian
Canals containingblood vessels in thecenter. Often found
around the outsideof large bones .
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A ears as a mass of bon tissue
lacking spaces visible to the unaided
eye Much denser with a porosity ranging
between 5% and 10%.
Found primary in the shaft of long bonesand forms the outer shell aroundcance ous one at t e en o o nts an
the vertebrae. The basic first level structure of corticalbone are osteons
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,
,B NE
Often found on inside, composed of
, of bone, around the bone-marrow
spaces .
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Trabecular cancellous, s on bone
The second type of bone.
Its basic first levels ruc ure s etrabeculae
=
irregular three-
dimensional arra ofboney rods and plates
Bone marrow fills the
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.
makes up the majority of vertebral bodies
Trabecular bone is more com liant than
cortical bone and it is believed to distribute
contact loads.
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Trabecular (cancellous) bone
(cont.)
ra ecu ar one as a muc grea er
surface area than cortical bone
Trabecular bone is much more
porous w t poros ty rang nganywhere from 50% to 90%.
It is found in the end of long bones invertebrae and in flat bones like thepelvis.
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The substantial modulus reduction upon
that trabecular bone is a damaging material.
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A trabecular bone from
a human vertebral body
Note that the
volume fraction(ratio of bone to
very low.
Typical volume
fractions forvertebral bodies
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and 20%.
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From fetal to 9 years old
ra ecu ar s ruc ure
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Stress on cortical bone
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