Which of the following is an example of a hard tissue injury?

A fracture is indeed an example of a hard tissue injury, as it involves a break or damage to the bone, a type of hard tissue in the body. Hard tissues include structures like bones and cartilage, which provide support, structure, and protection to various parts of the body. When these tissues are injured, it often results in a fracture, which can vary in severity and may require medical intervention for proper healing.

In contrast, muscle strains, tendonitis, and bruises represent injuries to soft tissues, which include muscles, tendons, and skin. Muscle strains involve the overstretching or tearing of muscle fibers, while tendonitis refers to inflammation of a tendon, typically due to overuse. Bruises are caused by the rupture of small blood vessels beneath the skin, leading to discoloration and swelling. Therefore, a fracture stands out as the only option involving a hard tissue injury.