CASE 1
A 68 year old woman presents to your office after retiring from New York City to South Carolina. She is interested in discussing her bone health. She notes that she had a DXA scan performed 3-5 years ago and was told that her bone density was slightly reduced and it was recommended that she take Calcium and Vitamin D supplementation. She is otherwise healthy. She has no specific complaints. She has never sustained a fracture. She denies tobacco or alcohol use. She reports that her mother fell and broke her hip at age 88 years old. Her current medications include Calcium with Vitamin D. Her vital signs are normal and her physical examination is unremarkable.
For her evaluation you request routine laboratory testing to include a comprehensive metabolic panel (CMP), complete blood count (CBC), and serum 25 (OH) Vitamin D level, and all of these tests are normal. A DXA scan is performed and reveals a T-score of L1-L4 to be -2.2, and the right femoral neck T-score is -2.6.
What are your recommendations to this patient?
The DXA scan interpretation reveals that the patient has osteoporosis of the femoral neck T-score of -2.6. She has a family history of osteoporosis with a maternal history of hip fracture. She is thus at increased risk for fracture and should be treated with pharmacologic therapy. The options include anti-resorptive agents such as the bisphosphonates, raloxifene, and denosumab. Raloxifene has been demonstrated to reduce the incidence of vertebral fractures however it does not reduce hip fracture incidence. She is at highest risk for a hip fracture, thus a better choice would be either a bisphosphonate or denosumab therapy. Considerations in the selection of an agent include route of administration (oral or intravenous bisphosphonate therapy or subcutaneous denosumab), frequency of administration and cost to the patient.
CASE 2
A 72 year old woman presents to your office after retiring from New York City to Florida. She is interested in discussing her bone health. She notes that she had a DXA scan performed 3-5 years ago and was told that her bone density was slightly reduced and it was recommended that she take Calcium and Vitamin D supplementation. She is otherwise healthy. She has no specific complaints. She has never sustained a fracture. She denies tobacco or alcohol use. She reports that her mother fell and broke her hip at the age of 88 years old. Her current medications include Calcium 1200 mg daily with Vitamin D 1000 IU daily. Her vital signs are normal and her physical examination is unremarkable.
For her evaluation you request routine laboratory testing to include a comprehensive metabolic panel (CMP), complete blood count (CBC), and serum 25 (OH) Vitamin D level, and all of these tests are normal. The DXA scan interpretation reveals a T-score of L1-L4 to be -1.8, and the right femoral neck T-score is -1.9. The FRAX scores corresponding to these T-scores indicate a 17% and 6.3% ten year probability of a major osteoporotic fracture and hip fracture, respectively.
How would you discuss the meaning of her DXA scan results and of the FRAX scores? What are your recommendations to this patient?
The FRAX tool is a fracture risk assessment tool based on the patient’s age, body mass index (BMI), tobacco use, alcohol use, presence of RA, use of glucocorticoids, prior history of fracture, parental history of hip fracture and presence of secondary causes of osteoporosis. The FRAX tool can be applied to patients with osteopenia (T-score between -1.0 and -2.5) who have not been taking medications for osteoporosis (except for Calcium and Vitamin D). It utilizes the femoral neck bone mineral density. Fifty percent of fractures occur in patients with osteopenia, so the FRAX tool is helpful to identify those patients at higher risk for fracture. The FRAX tool provides both a ten year probability prediction for a major osteoporotic fracture (hip, vertebral, forearm, humerus) and for a hip fracture. Thus, two risk predictions are provided for a ten year probability for fracture. For the United States, based on economic factors relating to the cost:benefit ratio, a 20%or higher probability of a major osteoporotic fracture or a 3% or higher probability of a hip fracture at ten years would warrant pharmacologic therapy for osteoporosis.
Thus, this patient is at increased risk for a fracture and should be treated for osteoporosis. She should be offered anti-resorptive therapy with the option of a bisphosphonate or denosumab.