Overview Alendronate in the Prevention of Collapse of Femoral Head in Non-Traumatic Osteonecrosis Status: Unknown status Trial end date: 2008-06-01 Target enrollment: Participant gender: Summary To determine the cumulative incidence of total hip replacement, time to event after treatment with Fosamax or placebo during the study peroid Phase: Phase 4 Details Lead Sponsor: Kaohsiung Medical University Chung-Ho Memorial HospitalCollaborators: Merck Sharp & Dohme Corp.National Cheng-Kung University HospitalNational Taiwan University HospitalTreatments: Alendronate