Normal Hand X-ray — Carpal Bones

A 28-year-old construction worker presents to the emergency department with severe wrist pain and swelling after a fall on an outstretched hand with the wrist in hyperextension. Lateral X-ray of the wrist shows the structure marked **B** displaced volar (palmar) to its normal anatomic position, while the radius and remaining carpal bones remain aligned. The radiologist notes a "spilled teacup" appearance on the lateral view. Which of the following is the most appropriate immediate management?