A 22-year-old male presents to the emergency department with pain and swelling over the dorsum of his right hand after punching a wall in anger. Clinical examination reveals a closed fist deformity with the 5th finger appearing to deviate slightly toward the midline. A lateral X-ray of the hand is obtained. The structures marked **D** in the diagram show normal alignment. However, the distal neck of the 5th metacarpal is fractured with 35° of volar angulation. Which of the following is the most appropriate management?