A 68-year-old postmenopausal woman presents with acute onset severe back pain after a minor fall while gardening. On examination, she has kyphosis and loss of height compared to her medical records from 5 years ago. X-ray of the thoracic spine shows a wedge-shaped compression fracture at T7 with 40% loss of vertebral body height. Her serum calcium is 8.8 mg/dL, phosphate 3.5 mg/dL, and alkaline phosphatase is normal. DEXA scan shows a T-score of −3.2 at the lumbar spine. Which of the following is the most appropriate next step in management?