Question

Place the following steps of bone repair in the correct sequence.

1.The bone callus is remodeled and primary bone is replaced with secondary bone.
2.A hematoma fills the gap between bone fragments.
3.Osteoblasts build a new bone callus.
4.Fibroblasts and chondroblasts infiltrate the hematoma and a soft callus forms.
a) 3, 2, 4, 1
b) 2, 3, 4, 1
c) 2, 4, 3, 1
d) 3, 2, 1, 4

Answer 1

The correct order of bone repair steps after a fracture is hematoma formation, soft callus formation, bony callus formation, and lastly, bone remodeling. This sequence is option c) 2, 4, 3, 1.

Step-by-step explanation:

The process of bone repair involves several critical stages that allow a bone to heal after a fracture. Here is the correct sequence of steps involved in bone healing:

1. Hematoma formation: After a fracture, blood vessels in the broken bone tear, leading to the formation of a hematoma at the site of the break.
2. Soft callus formation: Capillaries grow into the hematoma, and fibroblasts and chondroblasts create a soft callus of fibrocartilage.
3. Bony callus formation: The fibrocartilaginous callus is converted into a bony callus of spongy bone by osteoblasts.
4. Bone remodeling: The bony callus is remodeled by osteoclasts and osteoblasts, and the primary bone is replaced with secondary bone, which is similar to the original unbroken bone.

The sequence described above matches option c) 2, 4, 3, 1, which places the steps in the correct order as they occur during the process of bone repair.