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2D-FNA. a CT image of the femoral head and the femoral neck. The center of the femoral head and the femoral neck is connected to determine the femoral head-neck axis. b It shows the largest layer of the two femoral condyles; the points of A and B are the tangent of the posterior rim of the two condyles. The angle between the femoral head-neck axis and the tangent is 2D-FNA
