Final answer:
The main verb in the sentence is 'occurred,' signifying the action of fractures happening more frequently among boys. Injuries to the skeletal system like fractures can arise from different high-energy impacts or blunt forces.
Step-by-step explanation:
The main verb in the sentence 'According to the study, for boys, fractures occurred more often than concussions.' is occurred. This verb indicates the action that took place, which is that the fractures happened more frequently compared to concussions among boys.
In discussions about injuries to the skeletal system, terms like fractures, traumatic brain injuries, and head injuries are commonly used. Fractures can result from high-energy impacts or blunt forces, sometimes resulting in serious conditions such as linear skull fractures, comminuted fractures, or depressed fractures. The type of injury described is often determined by the force and nature of the impact.