EVERYDAY SCIENCE

Detailed explanation-1: -A soft callus (a type of soft bone) replaces the blood clot that formed in the inflammatory stage. The callus holds the bone together, but isn’t strong enough for the body part to be used. Over the next few weeks, the soft callus becomes harder.

Detailed explanation-2: -Recovering from a bone fracture takes time and patience. One important part of the healing process is the development of a bone callus. It develops at the site of the fracture, around 2 to 6 weeks after the bone is broken. A bone callus first starts off as soft fibrous tissue and cartilage.

Detailed explanation-3: -Osteoclasts resorb dead bone, while osteoblasts create new bone that replaces the cartilage in the calluses.

Detailed explanation-4: -The blood vessels supplying the bone and periosteum are ruptured during the fracture, causing a hematoma to form around the fracture site. The hematoma clots and forms the temporary frame for subsequent healing.

Detailed explanation-5: -The new bone starts to form when the hematoma is replaced by a soft callus, with new blood vessels inside. Fibers and cartilage are involved in the formation of this soft link between fragments of broken bone.