During soft callus formation, which cells contribute to the soft callus?

Prepare for the Tissue Injury, Healing, and Pain Test. Utilize flashcards and multiple-choice questions with hints and explanations. Ensure you're ready for the exam!

Soft callus formation is driven by local mesenchymal cells that respond to fracture by becoming tissue-forming cells. Chondroblasts lay down cartilage, creating a cartilaginous bridge that stabilizes the fracture, while fibroblasts fill the gap with fibrous tissue to add strength and continuity. Osteoblasts also contribute by laying down initial bone matrix at the fracture margins, supporting the transition from cartilaginous to bony tissue as healing progresses. This combination of cartilage, fibrous tissue, and early bone formation forms the soft callus that stabilizes the fracture long enough for the hard callus to develop.

Neutrophils and macrophages are mainly involved in cleanup and inflammation, not in forming the callus structure. Osteoclasts resorb bone rather than build the callus, and epithelial cells are not part of the bone-fracture callus process.