SSEH1101 Study Guide - Final Guide: Hyaline Cartilage, Granular Material, Medullary Cavity
19 Jun 2018
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SSEH1101: Revision Notes 9
Fracture Healing Steps:
-1. Hematoma formation!
-2. Granular material formation of fibrocartilage cells!
-3. Hard callus formation !
-4. Remodelling!
Hematoma Formation:
-Fracture causes blood vessels and periosteum to be torn!
-Haemorrhage happens !
-Hematoma then forms @ site!
-Hematoma = clotted blood mass!
-Bone cells deprived of nutrients due to hematoma !
-Bone cells die!
-Tissues inflamed, swollen, painful!
Granular Materials Formation:
-Formation of fibrocartilage callus!
-Happens within few days of soft granulation tissue formation (soft callus)!
-Caused by capillaries invading!
-Macrophages phagocytose cells to clean up debris!
-Fibroblast migrate into site!
-Fill area with collagen!
-Osteoblasts migrates to site from periosteum!
-Begin bone formation!
!
Hard Callus Formation:
-When osteoblast enter site!
-Causes new trabecular bone forming in soft callus!
-Hard callus starts forming 3-4 weeks after injury!
-Goes on for 2-3 months!
Remodelling:
-After hard callus formed for several months!
-Excess material around fracture site removed!
-Excess material from medullary cavity also removed!
-Compact bond padi down!
-Reform shaft walls!
-= HEALED!!
Fracture treatment types:
-REDUCTION!
