Final answer:
Reggie's fracture line would contact yellow marrow, which is primarily composed of adipose tissue or fat.
Step-by-step explanation:
In this situation, Reggie's fracture line would contact yellow marrow. Yellow marrow is found in the diaphysis, which is the shaft of the long bone. It is primarily composed of adipose tissue or fat. On the other hand, red marrow is found in the head of the femur and is responsible for hematopoiesis, the production of blood cells.
When a bone fractures, the yellow marrow in the diaphysis may be exposed and damaged. The body may release fat from healthy bones to help with the healing process. However, the red marrow in the fractured bone would not be directly involved in this process.