What occurs during the fibrocartilaginous callus formation phase?

• A. Hard calcified immature bone forms
• B. Granulation tissue forms within the hematoma
• C. Bone remodeling starts to occur
• D. Vascularization does not take place

Answer: (B)

During the fibrocartilaginous callus formation phase, granulation tissue forms within the hematoma. This phase is crucial for the healing process following a fracture. Initially, when a bone breaks, a blood clot forms at the injury site, creating a hematoma. As the body starts to heal, new blood vessels grow into this area, and fibroblasts proliferate, leading to the formation of granulation tissue.

Granulation tissue consists of new connective tissue and blood vessels, which serve to replace the damaged tissue and provide a scaffold for subsequent healing. The presence of this granulation tissue is vital, as it provides a temporary support structure that aids in the reparation of the bone and fosters nutrient delivery to the area, promoting further healing processes.

In later stages, once the granulation tissue has formed, it can later be replaced with fibrocartilage, which eventually develops into a hard callus made of immature bone, but this occurs after the granulation phase.