A Comparison of Subject-administered Romosozumab With Healthcare Provider-administered Romosozumab for Osteoporosis

Inclusion Criteria: * Subject has provided informed consent/assent prior to initiation of any studyspecific activities/procedures, or subject's legally acceptable representative has provided informed consent prior to any study-specific activities/procedures being initiated when the subject has any kind of condition that, in the opinion of the Investigator, may compromise the ability of the subject to give written informed consent. * Postmenopausal female (postmenopausal status is defined as no vaginal bleeding or spotting for 12 consecutive months prior to screening) -≥ 55 to ≤ 90 years of age at the time of informed consent * Ambulatory * BMD T-score ≤ -2.50 at the lumbar spine, total hip, or femoral neck, as assessed by the central imaging vendor at the time of screening, based on DXA scans -Subject has at least 2 vertebrae in the L1-L4 region evaluable by DXA, as assessed by the principal investigator or designee * Subject has at least 1 hip evaluable by DXA, as assessed by the principal investigator or designee * Subject has history of fragility (ie, osteoporosis-related fracture) or subject meets at least 2 of the following clinical risk factors for fracture * ≥ 70 years of age at the time of informed consent * BMD T-score ≤ -3.00 at the lumbar spine, total hip, or femoral neck, as assessed by the central imaging vendor at the time of screening, based on DXA scans * current smoker * consumption of ≥ 3 glasses of alcohol a day * parental history of fragility (ie, osteoporosis-related) fracture * body weight ≤ 125 pounds/56 kilogram * Ability to follow and understand instructions and the ability to self-inject, per investigator judgement Exclusion Criteria: * History of osteonecrosis of the jaw and/or atypical femoral fracture * History of metabolic or bone disease (except osteoporosis) that may interfere with the interpretation of the results, such as sclerosteosis, Paget's disease, rheumatoid arthritis, osteomalacia, osteogenesis imperfecta, osteopetrosis, ankylosing spondylitis, Cushing's disease, hyperprolactinemia, and malabsorption syndrome * Subject with reported history of hearing loss associated with cranial nerve VIII compression due to excessive bone growth (eg, as seen in conditions such as Paget's disease, sclerosteosis and osteopetrosis) * Vitamin D insufficiency \[defined as serum 25 (OH) vitamin D levels \< 20 ng/mL\], as determined by the central laboratory. Vitamin D repletion will be permitted a nd subjects may be rescreened * Current hyperthyroidism (unless well controlled on stable antithyroid therapy) by subject report or by chart review, per principal investigator evaluation * Current clinical hypothyroidism (unless well controlled on stable thyroid replacement therapy) by subject report or by chart review, per principal investigator evaluation normal range, per subject medical history. Uncontrolled hyperparathyroidism is defined as: parathyroid hormone (PTH) outside the normal range in subjects with concurrent hypercalcemia; or PTH values \> 20% above the upper limit of normal (ULN) in normocalcemic subjects. * Current hyper- or hypocalcemia, defined as albumin-adjusted serum calcium outside the normal range, as assessed by the central laboratory. Serum calcium levels may be retested once in case of an elevated serum calcium level within 1.1x the ULN as assessed by the central laboratory