Question

What are the steps in order of the bone healing process?

A. Bleeding /hematoma formation followed by organization into fibrous network
B. Invasion of osteoblasts, lengthening of collagen strands and Ca deposition
C. Callus Formation: new bone is buile up as osteoclasts destroy dead bone
D. remodeling as excess callus is resorbed and trabecular bone is laid down

Answer 1

The bone healing process involves bleeding/hematoma formation, organization into a fibrous network, callus formation, and remodeling.

Step-by-step explanation:

The steps in the bone healing process are as follows:

1. Bleeding/hematoma formation: Blood vessels tear and hemorrhage, forming a hematoma at the site of the broken bone. Clotted blood seals the severed blood vessels.
2. Organization into fibrous network: Fibroblasts and osteoblasts enter the area and begin reforming bone. Fibroblasts produce collagen fibers that connect the broken bone ends, and osteoblasts start to form spongy bone. The repair tissue between the broken bone ends is called the fibrocartilaginous callus.
3. Callus Formation: The fibrocartilaginous callus is converted into a bony callus of spongy bone. It takes about two months for the broken bone ends to be firmly joined together. Osteoblasts, osteoclasts, and bone matrix are present, similar to endochondral bone formation.
4. Remodeling: The bony callus is remodeled by osteoclasts and osteoblasts, with excess material being removed. Compact bone is added to create bone tissue similar to the original bone.