Final answer:
An ulnar gutter splint is recommended for injuries or fractures to the second or third metacarpals. It stabilizes the immobile and anchored nature of these bones, essential for preventing complications during healing.
Step-by-step explanation:
For soft tissue injuries, or fractures of the neck, shaft or base of the second or third metacarpals, the appropriate splint to be used is a ulnar gutter splint. This type of splint is designed to stabilize and immobilize the affected area. The second and third metacarpal bones are firmly anchored and immobile, which contrasts with the mobility found in the fourth and fifth metacarpal bones that allows for gripping actions. Correct immobilization is crucial to prevent complications such as bone necrosis or degenerative joint disease, which can arise from poor healing due to a lack of proper blood supply, as seen in scaphoid bone fractures.