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The Kaplan-Meier estimated survivorship for the followup cohort divided into low-grade (n = 84, 23 THAs) and high-grade (n = 27, 26 THAs) groups based on femoral Outerbridge grade using THA as an end point showed a decrease in 10-year survivorship for the high grades (12% [2%–22%]) compared with the low grades (80% [72%–88%], p < 0.001, log-rank test = 72.72).
