Fig. 2From: Percutaneous autologous impaction bone graft for advanced femoral head osteonecrosis: a retrospective observational study of unsatisfactory short-term outcomesRadiological joint preservation by Kaplan–Meier survival analysis. The Kaplan–Meier estimates conversion to THA as the endpoint. The 3-year cumulative survival rate indicated that conversion to THA was 35%. THA, total hip arthroplastyBack to article page