Lesson 7 Flashcards
1
Q
- any break in a bone
- named according to their severity, the shape or position of the fracture line, or even
the physician who first described them.
A
fracture
2
Q
- series of microscopic fissures in bone that forms without any evidence of injury to other tissues.
- painful and also result from disease processes that disrupt normal bone calcification
A
stress fracture
3
Q
PHASES OF BONE REPAIR
A
- REACTIVE PHASE
- REPARATIVE PHASE: FIBROCARTILAGINOUS CALLUS FORMATION
- REPARATIVE PHASE: BONY CALLUS FORMATION
- BONE REMODELING PHASE
4
Q
- early inflammatory phase
A
REACTIVE PHASE
5
Q
- As blood leaks from the torn ends of the vessels, a mass of blood or a _________
forms around the site of the fracture
A
fracture hematoma
6
Q
in reactive phase;
it forms __ to __ hours after injury
A
6 - 8
7
Q
- Blood vessels grow into the fracture hematoma and phagocytes begin to clean up dead bone cells.
- Fibroblasts from the periosteum invade the fracture site and produce collagen fiber.
A
REPARATIVE PHASE: FIBROCARTILAGINOUS FORMATION
8
Q
- In areas closer to well-vascularized healthy bone tissue, osteoprogenitor cells develop into osteoblasts, which begin to produce spongy bone trabeculae. The trabeculae join living and dead portions of the original bone fragments.
A
REPARATIVE PHASE: BONY CALLUS FORMATION
9
Q
the bony callus lasts about __ to __ months
A
3-4
10
Q
- The final phase of fracture repair is bone remodeling of the callus.
- Dead portions of the original fragments of broken bone are gradually resorbed by osteoclasts.
- Compact bone replaces spongy bone around the periphery of the fracture.
A
BONE REMODELING PHASE
11
Q
- breaks into 3 or more fragments
A
comminuted
12
Q
- bone is crushed
A
compression
13
Q
- broken bone portion is pressed inward
A
depressed
14
Q
- broken bone ends are forced into each other
A
impacted
15
Q
- ragged break occurs when excessive twisting forces are applied to a bone
A
spiral
