Final answer:
The orthopedic surgeon is describing the distal region of the humerus, which is part of the epiphysis.
Step-by-step explanation:
The orthopedic surgeon is describing the distal region of the humerus. In the structure of a long bone, the humerus consists of two parts: the diaphysis (tubular shaft) and the epiphysis (rounded end of the bone). The distal region refers to the end of the humerus away from the body, which would be part of the epiphysis.