Bones round 2
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Bones: Round 2. Andrew Richards & Ryan Swenson. Peak Functional Levels. Quantity of bone increases through life until skeletal maturity – Age 20-30 Peak Bone Mass is reached at this point “Bone Bank” used for remainder of life Growth rates differ at different sites

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Bones: Round 2

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Bones round 2

Bones: Round 2

Andrew Richards & Ryan Swenson


Peak functional levels

Peak Functional Levels

  • Quantity of bone increases through life until skeletal maturity – Age 20-30

  • Peak Bone Mass is reached at this point

    • “Bone Bank” used for remainder of life

    • Growth rates differ at different sites

  • Most rapid growth during adolescence

    • About 25% of PBM achieved during

      adolescent growth spurt


Peak functional levels1

Peak Functional Levels

  • Factors

    • Gender:

      • Men larger skeletons than women= larger “bank”

      • Women reach their peak sooner

        • Have lower BMD

    • Hereditary:

      • ¾ of skeletal characteristics

    • Environmental Factors

      • Strain placed on skeleton (Wolff’s Law)

      • Activities such as smoking can negatively impact


Increasing decreasing levels

Increasing/Decreasing Levels

  • Occurs during the process of bone remodeling along with natural growth

    • Resorption, reversal, and formation

    • Osteoclasts, osteoblasts, osteocytes, etc.


Increasing decreasing levels1

Increasing/Decreasing Levels

  • Remodeling process based off Wolff’s Law

    • Julius Wolff: German anatomist and surgeon

  • States that bone in a healthy person will adapt to the loads to which it is placed

    • Heavy Loads=increased levels

    • Long Term Immobilized=decreased levels


Dysfunctional levels

Dysfunctional Levels

  • As body ages bone levels decrease

  • Additionally, factors can increase the rate


Dysfunctional levels1

Dysfunctional Levels

  • Osteopenia: low bone mass

    • Occurs naturally to some degree with aging

    • Women lose roughly 8% per decade

    • Men lose roughly 3% per decade


Dysfunctional levels2

Dysfunctional Levels

  • Osteoporosis: Decreased bone strength compromising normal function, predisposing to an increased risk of fracture

    • Change in structure of trabecular bone

    • Relationship to common fracture sites

      • Spine, wrists, and hips


References

References

http://www.ncsf.org/pdf/ceu/establishing-peak-bone-mass.pdf

http://www.ncbi.nlm.nih.gov/books/NBK45504/


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