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Questions and Answers
What is the first step in the fracture healing process?
What is the first step in the fracture healing process?
- Ossification phase
- Remodeling phase
- Inflammatory phase (correct)
- Reparative phase
What structure forms as a result of fibroblast activity during the reparative phase?
What structure forms as a result of fibroblast activity during the reparative phase?
- Blood clot
- Ossified bone
- Nerve tissue
- Cartilaginous callus (correct)
How long does the formation of the callus typically take?
How long does the formation of the callus typically take?
- 2 to 6 weeks (correct)
- 8 to 12 weeks
- 6 to 8 weeks
- 1 to 2 weeks
Which cells are responsible for remodeling the bone during the healing process?
Which cells are responsible for remodeling the bone during the healing process?
What factors can influence the healing time of a bone fracture?
What factors can influence the healing time of a bone fracture?
Flashcards
Fracture Healing Inflammatory Phase
Fracture Healing Inflammatory Phase
Initial stage where blood clots (hematoma) form at the fracture site, followed by cell death (necrosis) of broken bone ends due to blood vessel damage.
Fracture Reparative Phase
Fracture Reparative Phase
Formation of a 'callus,' a temporary cartilaginous structure, bridging broken bone ends. This phase involves new blood vessels and connective tissue growth.
Fracture Remodeling Phase
Fracture Remodeling Phase
Replacement of the callus by bone tissue; involves osteoblasts creating new bone and osteoclasts removing excess bone.
Cartilaginous Callus
Cartilaginous Callus
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Healing Time Factors
Healing Time Factors
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Study Notes
Fracture Healing Stages
- Hematoma Formation (Inflammatory Phase): Damaged blood vessels in the periosteum and bone marrow create a blood clot (hematoma) at the fracture site. Necrosis (tissue death) occurs at the broken bone ends due to blood vessel damage. This necrotic tissue is reabsorbed. The fracture line can be seen on X-rays usually within 10 days of injury.
Reparative Phase
- Clot Repair and Callus Formation: New blood vessels emerge and fibroblasts (connective tissue cells from the periosteum) invade the hematoma. Fibroblasts produce collagen fibers forming a cartilaginous callus. This callus joins the broken bone ends internally and externally.
- Callus Formation Time: The callus takes 2 to 6 weeks to form.
Remodeling Phase
- Callus Ossification: Osteoblasts (bone-forming cells from the periosteum) enter the callus, transforming it into bone (ossification).
- Ossification Time: This process of ossification takes 3 weeks to several months (typically 4-6 weeks)
- Remodeling: Osteoclasts (bone-resorbing cells) gradually remove excess bone, leaving little evidence of the fracture.
- Remodeling Duration: This remodeling process can continue for as long as a year.
Factors Affecting Healing Time
- Age: Younger individuals heal faster.
- Nutrition: Adequate nutrition aids healing.
- Blood Supply: Sufficient blood supply to the fracture site is crucial.
- Fracture Type and Location: The specific type and location of the fracture influence healing time.
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