Short-term Functional Recovery Between Early- and Late Bisphosphonate Treatment Following Hemiarthroplasty

Inclusion Criteria: * Patient diagnosed with femoral neck fracture and was treated with bipolar hemiarthroplasty * Age more than 50 years old and bone mineral density (BMD) was in osteoporotic (T-score less than -2.5) or osteopenic (T-score between -1.0 and -2.5) ranges Exclusion Criteria: * Patients who were treated with bipolar hemiarthroplasty for more than 2 weeks * Patients with postoperative complications which affect the postoperative rehabilitation program e.g. intraoperative cracking or fracture, postoperative cardiac complication * Have contraindications for bisphosphonates use e.g. renal insufficiency (glomerular filtration rate (GFR) \< 30 ml/min), allergy to bisphosphonates, severe esophagitis, gastroesophageal reflux disease etc. * Patients with conditions/disorders which have an affect on bone mineral density or bone metabolism e.g. renal insufficiency, rheumatoid arthritis, Paget's disease, renal osteodystrophy, hyperparathyroidism, glucocorticoids use etc. * History of bisphosphonates use within 12 months * Open fracture, multiple fracture or multiple trauma patients * Pathological fracture * Bilateral lower extremity fractures * The pre-injury functional status of the patients is non-ambulatory