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LCCW Skeletal Anatomy Practice Test

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Which of the following describes the Bony Callus Formation?
Correct Answer:
Bony Callus Formation (new callus of spongy bone)
Explanation:
Fracture healing progresses through stages where soft tissue is progressively replaced by bone. The Bony Callus Formation is the stage in which the soft callus is replaced with new bone tissue, specifically a hard callus of spongy (trabecular) bone that bridges the fracture. Osteoblasts lay down new bone across the gap, creating a sturdy internal bridge that stabilizes the fracture. This hard callus forms after the fibrocartilaginous (soft) callus and before remodeling. It provides temporary stability for several weeks while the bone is remodeled into its final shape and density. The initial response right after fracture is hematoma formation, and remodeling is the final phase where spongy bone is converted to the mature lamellar bone and the bone contour is restored.

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