Final answer:
A sling and swathe are designed to adequately immobilize a shoulder joint by supporting the body and protecting the mobility and weaker stability of this joint, compared to the stability of carpal bones in the wrist.
Step-by-step explanation:
When properly applied, a sling and swathe will adequately immobilize a shoulder. This method of immobilization is designed to support the trunk of the body and protect the shoulder joint, which allows for a wide range of motion and is less stable compared to other joints like those in the hands or ankles. In contrast, carpal bones in the wrist allow for movements of the wrist and hand but have greater stability due to their structure. A sling and swathe, therefore, are not adequate for immobilizing joints such as the wrist, forearm, or knee because they are designed to support and immobilize the more mobile and weaker shoulder joint.