Efficacy of Alendronate for Preventing Collapse of Femoral Head in Adult Patients with Nontraumatic Osteonecrosis

Figure 4

Graph showing comparing collapse rates prevention between alendronate plus extracorporeal shockwave therapy (ESWT) and ESWT alone groups. The overall effect was similar in the both groups () with minimal heterogeneities (). The size of each square is proportional to the weight of the study. Z: value of weighted test for overall effect, CI: confidence interval, df: degree of freedom, test statistic.