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a, b The graph shows the risk ratio for femoral head collapse for CD plus BMMCs versus CD. a Excluding hips lost to follow-up or excluded from analysis. b Assuming that all hips lost to follow-up or hips excluded from analysis experienced femoral head collapse (worst-case scenario). Number of events represents the number of hips that progressed to the fractural stage of osteonecrosis (ARCO stage III or more).
