Final answer:
A primary union in wound healing refers to the process where wound edges are close together and can be fastened for efficient healing. In bone fractures, closed or open reductions are methods of repair, and healing involves several biological processes including hematoma formation and new bone creation.
Step-by-step explanation:
When multiple wounds are repaired with the same closure type, such as simple closure, a primary union is often the goal. This is a condition of a wound where the edges are brought together and fastened if necessary, which allows for quicker and more thorough healing. In the case of bone fractures, they can be repaired by closed reduction or open reduction, with fractures classified based on their complexity, location, and other features. Healing involves the formation of a hematoma, followed by callus formation, bone resorption by osteoclasts, and new bone creation by osteoblasts. Skin injury repair initiates with blood clot formation and progresses with the formation of granulation tissue and eventually scar formation if necessary.