Bone Marrow Adiposity and Fragility Fractures in Postmenopausal Women

Inclusion Criteria: * post-menopausal women : 50-90 years old * Group 1 (cases) : occurence of incident major osteoporotic fracture less than 12 months * Group 2 (controls) : no history of fragility fracture Exclusion Criteria: * Implants that are contraindicated for the magnetic resonance (MR) examination. * Implants that might create a health risk or other problem during an MR exam include: 1) cardiac pacemaker or implantable defibrillator, 2) catheter that has metal components that may pose a risk of a burn injury, 3) a ferromagnetic metal clip placed to prevent bleeding from an intracranial aneurysm, 4) an implanted medication pump (such as that used to deliver insulin or a pain-relieving drug), and 5) a cochlear implant. * body mass index \[BMI\] \>38 kg/m2, weight \>140 kg * Disease or current use of medications known to affect bone density, including oral glucocorticoids, treatments for osteoporosis (bisphosphonates, raloxifene, calcitonin, or PTH), hormone therapy. * Chronic kidney disease with DFG \<30 ml/mn