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The cumulative survivorship at 10 years for protrusio hips treated with circumferential trimming was 51% (95% CI, 34%-67%) compared with hips with classic FAI with (83%; 95% CI, 75%-91%; p < 0.001). Endpoints were defined as conversion to THA, progression of osteoarthrosis, and a Merle d’Aubigné-Postel score < 15.
