Setrusumab vs Bisphosphonates in Pediatric Subjects With Osteogenesis Imperfecta

Participants will be randomized 1:1 to receive either setrusumab or IV-BP. Following randomization, participants will receive setrusumab or IV-BP for up to 24 months during the Active-controlled Period. At the end of the Active-controlled Period all participants will enter the Extension Period and participants assigned to IV-BP will transition to setrusumab. During the Extension Period, all participants will receive setrusumab for a minimum of 12 months or until setrusumab becomes commercially available in their respective country or the study is discontinued. The use of any bisphosphonate is prohibited throughout the Extension Period.