Diagnostic sensitivity and specificity of dynamic three-dimensional CT analysis in detection of cam and pincer type femoroacetabular impingement

摘要

Background: Cam and pincer-type morphologies can cause femoroacetabular impingement syndrome (FAI) andcan be measured on plain radiographs using the alpha angle and the center edge angle. As an addition to plainradiographs and to assess femoroacetabular impingement, it is possible to visualize the interplay of the acetabularand femoral morphology by means of dynamic three-dimensional simulation of hip joint. Therefore, the objectiveof this study is to compare alpha angles and center edge angles on plain radiographs with the dynamiccomputerized tomography (CT) analysis in patients with complaints of femoroacetabular impingement.Methods: All patients from our prospective cohort from 2012 to 2015 who underwent radiographs and a dynamicCT analysis for FAI were selected. Cam type morphologies were measured with the alpha angle and pincer typemorphologies with lateral center-edge angle on radiographs and with CT analysis. The dynamic CT analysis alsocalculated position and size of impingement of femur and acetabulum. Intra-operative assessment was used toconfirm impingement. Sensitivity, specificity and predictive values were calculated compared with respect to theintra-operative assessment.Results: A total of 127 patients were included. 90 cam morphologies and 45 pincer morphologies were identifiedintra-operatively.The sensitivity and specificity for cam morphology measured with radiographs was 84 and 72% compared to 90and 43% with three dimensional dynamic analyses. The sensitivity and specificity for pincer morphology measuredwith radiographs was 82 and 39% compared to 84 and 51% with three dimensional dynamic analyses.Conclusions: Diagnostic accuracy is comparable in three-dimensional dynamic analysis of CT scans andradiographs representing FAI caused by cam or pincer type morphology.