Bone Fractures

• Types of bone fractures

  - Closed (simple) fracture: break that does not penetrate the skin

  - Open (compound) fracture: broken bone penetrates through the skin

  
• Bone fractures are treated by reduction and immobilization


  1. Closed reduction: bones are manually coaxed into position by physician's hands

  
  

  2. Open reduction: bones are secured with pins or wires during
• Healing time is


  6-8 weeks
• Repair of bone fractures involves four major events

  -Hematoma (blood-filled swelling, or bruise) is formed

  -Fibrocartilage callus forms

  a.)Cartilage matrix, bony matrix, collagen fibers splint the broken bone

  -Bony callus replaces the fibrocartilage callus

  a.)Osteoblasts and osteoclasts migrate in

  -Bone remodeling occurs in response to mechanical stresses