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The Kaplan-Meier estimated survivorship for the followup cohort divided into low-grade (n = 79, 20 THAs) and high-grade (n = 32, 29 THAs) groups based on acetabular Outerbridge grade using THA as an end point showed a decrease in 10-year survivorship for the high grades (22% [9%–35%]) compared with the low grades (80% [71%–89%], p < 0.001, log-rank test = 59.75).
