10 - Osteomyelitis_2010 - D3

10 - Osteomyelitis_2010 - D3 - Bone Infections Outline...

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Bone Infections
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Outline Acute Osteomyelitis Subacute Osteomyelitis Post-Operative Infections
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Defining Osteomyelitis What’s in a Name? Osteomyelitis ( Osteo - bone, Myelo - Marrow, and –itis - Inflammation)
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Defining Osteomyelitis What is it? It is an infection of the of the bone or bone marrow which leads to a subsequent Inflammatory process.
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Defining Osteomyelitis Where does it come from? Micro-Organisms may reach bones via the Bloodstream or by Direct Invasion .
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Defining Osteomyelitis What affects it’s development? Organism involved Host Factors (i.e. Age, Immunity, Diseases) Site of Involvement (i.e. local factors)
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Defining Osteomyelitis What affects it’s development? Organism involved Host Factors (i.e. Age, Immunity, Diseases) Site of Involvement (i.e. local factors)
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Acute Osteomyelitis Types of Acute Osteomyelitis I. Hematogenous Osteomyelitis II. Direct Inoculation Osteomyelitis
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Acute Osteomyelitis Hematogenous Osteomyelitis: Bacterial seeding from the blood. Seen primarily in Children. The most common site is the Metaphysis at the growing end of Long Bones in Children, and The Vertebrae and pelvic in Adults.
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Acute Osteomyelitis Direct Inoculation Osteomyelitis Direct contact of the tissue and bacteria as a result of an Open Fracture or Trauma. Tend to involve multiple organisms.
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Acute Osteomyelitis Causative Organisms: Staphylococcus aureus (Mainly) Streptoccous pyogens or pneumoniae. (Less) H.Influenzae (Young Children) Salmonella (Sickle-Cell)
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Acute Osteomyelitis Pathology: Inflammation. Earliest Change Increase interaosseous pressure leads to Pain. Suppuration. Pus @ Medulla =Volkmann canals=>Surface => Subperiosteal Abscess=> spread along the shaft=> re-enter the bone or burst into the soft tissue May extend to Epiphysis and Metaphysis in Neonates and Children. May extend to Interverteberal Discs in Adults.
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Acute Osteomyelitis Pathology: Necrosis. Begin to see signs with in one week.
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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10 - Osteomyelitis_2010 - D3 - Bone Infections Outline...

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