What does the presence of a callus bridging the fracture line indicate about healing?

• A. There is ongoing fresh fracture
• B. No healing occurred
• C. The bone is infected
• D. Healing is underway or has occurred

Answer: (D)

Seeing a callus bridge across the fracture line shows that bone repair is progressing and healing is underway or has completed. After a fracture, repair moves from an inflammatory response to soft callus formation and then to a hard callus that spans the gap, ultimately remodeling into mature bone. When imaging reveals a continuous bridge of new bone linking the fragments, it means the reparative process has advanced beyond an unresolved, fresh break. If there were no healing, the fracture line would remain unbridged. Infection can produce other signs on imaging, but the presence of bridging callus specifically indicates repair is taking place.