This is a multicenter, observational and non-interventional study in PMO patients who receive Prolia® (60 mg subcutaneous [SC]) in France. Patients in the study will be enrolled in 2 waves, each targeting specific aspects of the overall study objectives. The first wave will enroll approximately 500 patients who will be followed for approximately 30 months from the first injection. Patients enrolled in this wave will provide descriptive data on persistence to Prolia® as well as a description of the characteristics of patients being prescribed Prolia®, information regarding Prolia® prescription and administration, procedures pertaining to Prolia® and safety.