Which phase of bone healing is characterized by the formation of a soft callus?

• A. Inflammation phase
• B. Hard callus phase
• C. Proliferation phase
• D. Remodeling phase

Answer: (C)

The formation of a soft callus occurs during the proliferation phase of bone healing. This phase follows the initial inflammatory phase, where the body responds to the fracture by forming a hematoma and initiating the healing process.

During the proliferation phase, fibroblasts and chondroblasts play a crucial role as they migrate to the fracture site and produce collagen and cartilage, respectively. This results in the creation of a soft callus that helps stabilize the fracture. The soft callus is essentially a temporary bridge made up of fibrous tissue and cartilage that provides initial support for the fracture while it is still vulnerable.

As healing progresses, the soft callus will later transition into a hard callus in the next phase, which is characterized by the ossification process where new bone tissue is formed. This eventually leads to the remodeling phase, where the new bone is reshaped and strengthened according to structural demands.

Understanding the dynamics of each phase is essential for effective treatment and rehabilitation strategies following a fracture, emphasizing the significance of the proliferation phase in bone healing.