Final answer:
Gardner-Wells tongs are used to immobilize the cervical spine in clients with spinal injuries. They stabilize the neck to prevent further damage. A defective thoracic cage most puts the heart at risk as this structure protects vital thoracic organs.
Step-by-step explanation:
A client with a cervical spine injury has Gardner-Wells tongs inserted to immobilize the cervical spine. These devices help to maintain proper alignment and prevent further injury by anchoring the head and applying traction to the cervical spinal column. It's important to ensure that the cervical spine is stable so as not to compromise the spinal cord or associated nerves.
In regards to thoracic cage abnormalities, if someone had a defective thoracic cage, the organ most at risk would be the heart. The thoracic cage provides protection to the vital organs housed within the thorax, predominantly the heart and lungs. In the case of a defective thoracic cage, these organs might not be adequately protected, leading to compromised function or additional health risks.