You fall while roller-skating and notice a hematoma on your tibia, suggesting that you damaged the bone. Describe step by step how your bone will heal

Question

What will be an ideal response?

Answer 1

Within a few days, connective tissue cells called fibroblasts grow inward from the periosteum and invade the clot. The fibroblasts secrete collagen fibers that form a mass called a callus, which links the broken surfaces of the bone. Some of the fibroblasts then transform into cartilage-producing cells that secrete cartilage into the callus. Next, osteoblasts from the periosteum invade the callus and begin to transform the newly deposited cartilage into new bone material, changing it into a bony callus. During this transformation, the bony callus becomes thicker than the undamaged part of the bone and protrudes from it. In time, however, the extra material is broken down, and the healed part of the bone returns to nearly normal size.