What type of wound healing involves the granulation tissue filling the wound?

The type of wound healing that involves granulation tissue filling the wound is secondary intention healing. This method occurs when a wound is left open to heal from the bottom up, allowing granulation tissue to form. Granulation tissue is vital in this process; it contains new connective tissue and microscopic blood vessels that help in the healing process by providing the necessary nutrients and support for the development of a more stable scar tissue.

In secondary intention healing, the wound edges cannot be approximated, so the body needs to generate new tissue to fill in the defect over time. This healing process is usually seen in larger, deeper wounds or when the risk of infection is high. The granulation tissue ultimately matures and is replaced by more organized collagen, resulting in scar formation.

Other forms of wound healing, such as primary intention, typically involve suturing or closing the wound edges together, minimizing the granulation tissue formation. Tertiary intention healing, also known as delayed primary closure, involves cleaning and observing the wound before closure, and while it may allow for granulation, it does not primarily depend on it filling the wound. Trauma healing, while related to wound treatment, does not specifically categorize the healing process, making secondary intention the most accurate choice here.