For a patient with severe back pain and numbness after a football injury, what should the first action be after manual in-line spinal stabilization?

In this situation, after establishing manual in-line spinal stabilization, assessing the airway and breathing is crucial. The priority in any trauma scenario, especially with severe back pain and numbness, is to ensure that the patient's airway is patent and that they are breathing adequately. Complications such as respiratory failure can occur due to spinal injuries, and these must be addressed immediately.

By focusing first on the airway and breathing, you ensure that vital functions are monitored and maintained. If either is compromised, immediate interventions can be implemented. After ensuring that these critical functions are stable, further assessments of motor response, conducting a head-to-toe evaluation, or calling for advanced medical support can be conducted in a systematic manner.

In trauma scenarios, the primary survey must always address life-threatening conditions before delving into other aspects of assessment, making airway and breathing the most important first actions after stabilization.