Automatic femoral ante version angle measurement in revision total hip arthroplasty (tha)

Total Hip Arthroplasty (THA) using roentgenogram helps to detect and treat the loosening and misalignment of femoral component. Segmentation of the femoral and acetabular components is the most important process in computer aided diagnosis. This paper presents a fully automated loosening detection system for X-ray images. Anterior pelvic plane (APP) coordinates are used to measure the inclination and anteversion angle between the femoral and acetabular components. The proposed approach consists of the following modules. First we detect the edges of femoral and acetabular components. Secondly we find the center of the femoral component. Thirdly the pelvic coordinates are matched with it. Finally we measure the anteversion angle and loosening gap between the femoral and acetabular components. The proposed method is analyzed using a data set consisting of 108 images. Preliminary results show that the proposed method is computationally efficient and fast.

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