Which of the following is a sign that you should suspect a spinal injury?

The inability to move the legs is a significant indicator that suggests the possibility of a spinal injury. When someone cannot move their legs, it may indicate that there is damage or injury to the spinal cord or the surrounding structures that control motor function. The spinal cord is responsible for transmitting signals between the brain and the body; therefore, any interruption in this communication can lead to loss of sensation or movement. This symptom is particularly concerning and necessitates immediate medical evaluation and care as spinal injuries can lead to long-term complications or paralysis.

In contrast, while headaches, low blood pressure, and skin abrasions can be associated with various injuries or medical conditions, they do not directly indicate a spinal injury. Headaches could arise from concussions or other head injuries, low blood pressure may signal shock or other medical issues, and skin abrasions may be the result of abrasions in a fall but do not provide direct evidence of spinal trauma. Thus, the inability to move the legs stands out as the most concerning sign to prompt the suspicion of a spinal injury.