Relación entre el signo de Entrecruzamiento y el ángulo de versión acetabular en tomografía axial computada

Abstract

Introduction.The crossover sign (CS) is proposed in the diagnosis of pincer-type femoroacetabular impingement (FAI). CS occurs in the cranial region of the acetabulum while the acetabular version angle (AV) is measured in the region where the acetabulum becomes deeper. Objective. To determine whether AV values measured in cranial regions using the classical measures relate better to the findings for positive CS. Material and Methods. Cross sectional study in asymptomatic patients. Images were obtained by CT of the abdomen and pelvis. They were recored in anterior-posterior reconstruction the CS and in axial reconstruction the AV angle. Logistic regression models for measuring AV in 7 cephalic levels to caudal with 95% CI were estimated. Results. 104 patients were measured. At Level 3 an area under ROC curve 0.81 (0.74-0.87), cutoff value of 11.2º with sensitivity of 80.0% and specificity of 73.0%, was obtained. Conclusion. AV at level 3 has higher diagnostic capacity for the presence of positive CS.