Bone Healing

Question 1

Phase 1

Answer 1

Hematoma formation

Clot produced in 6-8 hours. Inflammation brings phagocytic cells, new capillaries grow into damaged area.

Question 2

Phase 2

Answer 2

Fibrocartilaginous callus formation.
Fibrocartilage lays down collagen.
Chondriblasts produce fibrocartilage.

Question 3

Phase 3

Answer 3

Bony callus formation.

Osteoblasts secrete spongy bone that joins broken bone ends. Lasts 3-4 months.

Question 4

Phase 4

Answer 4

Compact bone replaces spongy bone callus, surface is remodelled back to normal shape.