The 4 Stages of Bone healing

Question 1

Stage 1

Answer 1

Hematoma Formation:

1. Blood vessels are broken during the fracture.
2. Blood + fluid leak out to form a hematoma

Question 2

Stage 2

Answer 2

Fibrocartilage Callus Formation:

1. New capillary growth + disposal of dead tissue by phagocytes
   - 2. Connective tissue cells enter the area + form a mass of repair tissue.

Question 3

Stage 3

Answer 3

Bony Callus Formation:

1. Osteoclast + osteoblast enter the area + multiply
2. The fibrocartilage callus is replaced by spongy bone.

Question 4

Stage 4

Answer 4

Bone Remodelling:

1. Over weeks + months the bone responds to “mechanical stress” to remodel.
2. It creates a strong permanent patch at the fracture site.