Final answer:
A hip fracture 6 months ago is a risk factor for osteoporosis.
Step-by-step explanation:
The nurse should recognize a hip fracture 6 months ago as a risk factor for osteoporosis. Osteoporosis is a condition where bones lose mass and become weak, making them more prone to fractures. Having a previous fracture, especially in the hip, is a significant risk factor for developing osteoporosis.