Final answer:
Vertical shearing fractures of the pelvis are considered totally unstable due to the significant compromise to the integrity of the pelvis ring-like structure and typically require surgical intervention.
Step-by-step explanation:
Vertical shearing fractures of the pelvis are considered totally unstable. Pelvic fractures vary in severity and can be classified based on their stability. Since the pelvis is a ring-like structure, fractures that disrupt its integrity, such as vertical shearing fractures, significantly compromise stability and therefore are seen as totally unstable. These types of injuries usually require surgical intervention due to the high risk of damage to surrounding organs and blood vessels, and the potential for significant blood loss.