A Study That Will Compare the Effect of Two Drugs on Participants With Low Bone Mass and a Recent Hip Fracture

Comparison of the Effects of Teriparatide With Those of Risedronate on Lumbar Spine BMD (Bone Mineral Density) in Men and Postmenopausal Women With Low Bone Mass and a Recent Pertrochanteric Hip Fracture

This study will evaluate whether teriparatide is superior to the active comparator in the change from baseline of lumbar spine BMD (bone mineral density) in men and postmenopausal women with low bone mass and a recent pertrochanteric hip fracture.

The study has 3 periods: a screening phase, a double-blind, double-dummy treatment phase from the time of randomization to the 26 weeks visit, and an open-label treatment phase of approximately 12 month duration, where participants will continue treatment with the same study drug that they were randomized to.

Inclusion Criteria:

• Men and postmenopausal women aged ≥50 who have sustained a unilateral, fracture of the trochanteric region
• Lumbar spine BMD and/or femoral neck BMD and/or total hip BMD measurement of the contra lateral hip at least 2.0 SDs (standard deviation) below the average bone mass for young women and men

Exclusion Criteria:

• Clinically significant abnormal laboratory values
• History of unresolved skeletal diseases that affect bone metabolism
• Polytrauma participants and participants with fractures at more than one site