Extension Study to Evaluate the Long Term Safety and Efficacy of Denosumab in the Treatment of Osteoporosis

Postmenopausal women who have attended the 20030216 (NCT00089791) study month 36 visit will be eligible to participate if they meet the inclusion and exclusion criteria given below. Inclusion Criteria - Subjects must sign the informed consent before any study specific procedures are performed and agree to receive denosumab 60 mg subcutaneous injection every 6 months - Subjects must not have discontinued investigational product during the 20030216 study and must have attended the 20030216 study month 36 visit -Subjects must be re-consented prior to (or at) the 24 month visit for participation beyond month 24. Exclusion Criteria -Permanently non-ambulatory subjects (use of an assistive device eg, cane, walker, etc. is permitted) - Missed 2 or more investigational product doses during the 20030216 study - Any disorder that, in the opinion of the investigator, may compromise the ability of the subject to give written informed consent and/or comply with study procedures - Developed sensitivity to mammalian cell derived drug products during the 20030216 study - Unable to tolerate calcium supplementation during the last 6 months of participation in the 20030216 study (between the month 30 and month 36 20030216 study visits) -Currently receiving any investigational product other than denosumab or having received any investigational product during the 20030216 study -Current use of the following osteoporosis agents: bisphosphonates, calcitonin, fluoride, parathyroid hormone, selective estrogen receptor modulators, systemic oral or transdermal estrogen (except vaginal preparations and estrogen creams which are acceptable), strontium, or tibolone - For bone biopsy sub-study subjects only: known or suspected sensitivity or contraindication to tetracycline derivatives