Figure 1. Flowchart showing the number of patients excluded from the final analysis of the study.

* Patients coded as presenting femoroacetabular impingement (FAI) that were operated upon for other diagnoses (diagnostic arthroscopy, intraarticular free bodies, trochanteric bursitis, snapping hip), or who underwent other procedures: diagnostic infiltrations, etc.; ** patients coded as undergoing primary total hip arthroplasty (THA) that were operated upon for other diagnoses, such as THA revision surgery, secondary coxarthrosis, proximal femoral fracture, avascular necrosis, etc.; *** FAI secondary to: epiphysiolysis, Legg-Calvé-Perthes disease, dysplasia, fracture, traumatism, osteonecrosis or infections.