Final answer:
The log-roll maneuver causes less spinal motion than the lift-and-slide and is designed for moving patients with suspected spinal injuries, but it is not recommended for unstable pelvic fractures nor does it decrease the risk of hemorrhage from such injuries.
Step-by-step explanation:
The log-roll maneuver is a technique used in emergency settings to move a patient with a suspected spinal injury while maintaining spinal alignment. It's a synchronized team effort, typically involving three or more rescuers.
Answering the student's question, a. it causes less spinal motion than the lift-and-slide maneuver is true about the log-roll maneuver. The technique is designed to minimize movement of the spine during patient repositioning or transfer. However, b. it is not recommended for patients with unstable pelvic fractures due to the potential of exacerbating the injury. For choice c, it should not be avoided with a suspected spine injury before imaging; in fact, it is specifically used for spine injury cases. Lastly, d. there is no direct evidence that the log-roll maneuver decreases the risk of hemorrhage from unstable pelvic injuries. Instead, this technique is focused on protecting the spinal column during patient movement.