The repair of broken bones involves a complex process that occurs in four main phases. Initially, a hematoma forms at the fracture site due to torn blood vessels, leading to swelling and pain. This is followed by the formation of a soft callus, where fibroblasts and osteoblasts migrate to the area to begin constructing new bone. The soft callus is then gradually converted into a bony callus as bone formation continues. Finally, the bony callus undergoes remodeling over several months, restoring the bone to its original structure and strength, responding to mechanical stimuli during the healing process
What is the first phase of bone repair after a fracture?
The first phase is hematoma formation, where a mass of clotted blood forms at the fracture site due to torn blood vessels
How long does it typically take for a soft callus to form after a fracture?
A soft callus typically begins to form within 3-4 weeks after the fracture
What types of cells are involved in the formation of the soft callus?
Fibroblasts and osteoblasts are the cells that migrate to the fracture site to construct new bone during soft callus formation
What is the purpose of the bony callus in the healing process?
The bony callus serves to stabilize the fracture by gradually converting the soft callus into a firmer structure, providing strength to the healing bone
How long does it generally take for a firm bony union to form after a fracture?
A firm bony union typically forms within 2-3 months after the injury
What is the first step in the repair process of a broken bone?
a) Soft callus formation
b) Hematoma formation
c) Bony callus formation
d) Remodeling
Answer: b) Hematoma formation
How long does it typically take for a soft callus to form after a fracture?
a) 1-2 days
b) 3-4 weeks
c) 2-3 months
d) 6-12 months
Answer: b) 3-4 weeks
Which cells are primarily responsible for the formation of new bone during the healing process?
a) Chondrocytes
b) Osteoblasts
c) Osteoclasts
d) Fibroblasts
Answer: b) Osteoblasts
What is the purpose of the bony callus in the healing process?
a) To provide flexibility
b) To stabilize the fracture
c) To reduce swelling
d) To promote blood flow
Answer: b) To stabilize the fracture
What happens during the remodeling phase of bone repair?
a) New blood vessels form
b) The bony callus is reshaped
c) Hematoma is formed
d) Soft callus is created
Answer: b) The bony callus is reshaped