ACETABULAR PLACEMENT ANGLES DETERMINED BY PELVIC LOCAL LANDMARKS

SummaryStudy showed a simple acetabular placement plane formed by pelvic landmarks. The plane was adjusted by changing one of the landmarks to a fixed value for best representing the native acetabular orientation based on CT generated 3D pelviIntroductionCorrect acetabular cup placement is a critical step to prevent dislocation in the total hip arthroplasty. There are many mechanical alignment devices available but they are usually only referencing to the body long axis and the table therefore are lack of accuracy. Recently more accurate guide was achieved by image or imageless hip navigation system. But they add more cost, steps and time. The purpose of this study was to find a simple acetabular cup placement plane by selcting bonny land marks. The plane was adjusted with a fixed value by comparing it to native acetabular orientation in CT constructed 3D pelvi.Methods274 anonymous CT pelvic scans from skeletally mature, normal Caucasian population with age range of 20–93 years old (mean age=64). The popu...