Which of the following patients is at the highest risk of a hip fracture?

A. 72 year old female with obesity, taking a bisphosphonate, calcium and vitamin D. Recently started weight-bearing exercise: Although age and female sex increase fracture risk, this patient is receiving osteoporosis prevention therapy and performing weight-bearing exercise, which help maintain bone density and reduce fracture risk. B. 55 year old post-menopausal female who exercises daily and takes hormone replacement therapy: Regular exercise and hormone replacement therapy support bone health in postmenopausal women, lowering the likelihood of fractures despite age-related bone loss. C. 64 year old malnourished post-menopausal woman not taking estrogen, with orthostatic hypotension and a history of osteoporosis: This patient has multiple risk factors—advanced age, postmenopausal status without estrogen therapy, malnutrition, history of osteoporosis, and orthostatic hypotension (increasing fall risk). These factors place her at the highest risk for hip fracture. D. 84 year old female with high blood pressure, overweight, and takes a bisphosphonate: While older age increases fracture risk, the patient’s bisphosphonate therapy helps protect bone density. Being overweight may provide some cushioning in falls, and hypertension alone is less predictive than the combination of malnutrition, osteoporosis, and postural instability seen in option C.