What technique is most effective for lifting a person with a suspected spinal injury?

The two-person log roll technique is considered the most effective for lifting a person with a suspected spinal injury because it minimizes spinal movement and keeps the individual's spine in a neutral position. This technique involves two rescuers rolling the person onto a long board or stretcher without twisting or bending their body, which is crucial in preventing further injury to the spine.

Maintaining spinal alignment is essential in cases of suspected spinal injury to avoid exacerbating potential injuries to the spinal cord. The log roll allows for controlled movement and is suitable for situations where the patient may need to be moved from a prone position to a more secure transportation device, facilitating safer handling in emergency medical situations.

Other techniques like a vertical lift, four-man lift, or one-person drag are less appropriate as they may involve more movement of the spine or require lifting that could cause twisting or bending, increasing the risk of further damage to the spine. Hence, the two-person log roll is the safest and most effective choice under these circumstances.