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Bone Formation and Remodeling bone fractures

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Title: Slide 1 Author: Robin Huggins Last modified by: FCBOE Created Date: 11/7/2011 7:34:55 PM Document presentation format: On-screen Show (4:3) Other titles – PowerPoint PPT presentation

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Title: Bone Formation and Remodeling bone fractures


1
Bone Formation and Remodeling bone fractures
2
Bone Formation
  • skeleton bone and cartilage
  • embryos hyaline cartilage
  • young children most replaced by bone
  • bridge of nose, parts of ribs, joints still
    cartilage
  • ossification bone formation
  • lose hyaline cartilage
  • keep articular cartilage

3
bone remodeling
  • allows for normal proportions and strength during
    long bone growth
  • response to
  • calcium levels in blood
  • removal or deposit of calcium in/from bones
  • pull on bones from gravity and muscles
  • build bone strength through stress
  • atrophy loss due to lack of stress
  • rickets bones of children fail to calcify

4
bone fractures
  • Young bones break from trauma.
  • Older bones break due to thinning and weakening.

5
Types of fractures
  • simple
  • clean break
  • no skin penetration

6
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7
types of fractures
  • compound
  • broken ends protrude through soft tissue and skin
  • also called open fracture
  • big risk of infection

8
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9
Types of fractures
  • comminuted
  • many small pieces
  • common in elderly
  • compression
  • crushed bone
  • pressed inward (skull fracture)

10
Types of fractures
  • impacted
  • broken ends forced onto
  • each other (hip or wrist)

11
types of fractures
  • spiral
  • twisting break (sports)
  • greenstick
  • incomplete break

12
treatment of fractures
  • reduction realignment of broken ends
  • closed reduction rejoined without surgery
  • open reduction surgery using pins and wires
  • immobilized for 6 to 8 weeks

13
bone repair
  • hematoma
  • fibrocartilage callus
  • granulation tissue cartilage, matrix, collagen
  • closes gap in bone
  • bony callus
  • replaces fibrocartilage callus
  • remodeled due to stress on fracture site
  • Patches fracture over several months.
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