When splinting a long-bone injury, which part(s) of the extremity should be immobilized?

The correct choice involves immobilizing both the injured bone and the joints above and below it. This approach is crucial for several reasons. First, immobilizing the entire segment reduces movement at the fracture site, thereby minimizing pain and the potential for further injury. By including the joints above and below the fracture, you help to ensure that the entire limb remains stable, preventing any motion that could exacerbate the injury.

Additionally, in the case of a long-bone fracture, movements at the joints can inadvertently cause movement at the fracture site, leading to complications such as further damage to surrounding tissues or blood vessels. Proper splinting techniques seek to maintain the natural alignment of the limb, which helps in the healing process.

In contrast, options that suggest only immobilizing the injured bone or only the joints would not adequately address the stability needed for the overall extremity. Similarly, solely focusing on the muscle surrounding the bone does not provide the necessary support and alignment required for effective treatment of a long-bone fracture. Thus, comprehensive immobilization is essential for proper care in such injuries.