1. Bone Formation,growth, and
Remodeling

2. • Osteon (haversian system)
• lamellae
• perforating fibers
• compact bone
• blood vessels
• periosteum
• central canal
• perforating canal
• blood vessel
Parts of Compact Bone

3. • lamella
• osteocyte
• lacuna
• canaliculus
• matrix
• spongy bone

4. Microscopic structure of compact
bone

5. Long bone formation growth

7. common types of fractures

8. - bone breaks into many framents.
Comminuted

9. Compression
-bone is crushed

10. Depressed
-broken bone portion is pressed inward

11. Impacted
-broken bone ends are forced int each
othe.

12. Green stick
-bone breaks incompletely, much in the way a
green twig breaks.

13. Stages in the healing of a bone

14. The repair of bone fractures
involves four major events
1.A hematoma is formed-blood vessels are
ruptured when the bone breaks. as a result a
blood-filed swelling called a hemaoma forms.
Bone cells deprived of nutrition die.
2.The breka is splinted by a fibrocartilage
callus-an early event of tissue repair (and
bone is no exception)is growthbof new
capillaries into the clotted blood at the site of
the damage, and the disposal of dead tissue

15. as this goes on, connective tissue cells of various
types form a mass of repair tissue, the
fibrocartilage callus that contains several
elements -some cartilage matrix, some bony
matrix ,and collagen fibers-and acts to
''splints'' the broken bone,closing the gap.
3.The bony callus is formed as more osteoblasts
and osteoclasts migrate into the area and
multiply,the fibrocartilage callus is gradually
replaced by one made of spongy bone,the
bony callus.

16. 4.bone remodelling occurs-over the next few
weeks to month depending onthe bone's size
and site of the break, the bony callus is
remodeled in response to the mechanical
stresses placed on it, so that it forms a strong
permanent ''patch'' at the fracture site.