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In Heinrich's Domino Theory of Accident Causation, the final factor is the "Injury." This theory is built around a chain of events that lead from hazards through unsafe acts and conditions, culminating in accidents, which then typically result in injuries.

The concept illustrates that if the initial factors, such as hazards and unsafe acts, are addressed or mitigated, the subsequent elements—including accidents and injuries—can be prevented. Therefore, the injury is viewed as the endpoint of a series of causes that can potentially be interrupted or prevented by taking corrective actions at earlier stages in the domino sequence. This highlights the importance of safety measures and preventive actions in the workplace to decrease the likelihood of injuries. Understanding this chain reaction can aid in developing effective safety protocols and training to minimize risks and protect individuals.