Fig. 3From: The trochanteric double contour is a valuable landmark for assessing femoral offset underestimation on standard radiographs: a retrospective studya The apparent femoral neck length, LN*, was measured on the anteroposterior radiograph as the full bone length spanning the cortical surface of the femoral head to the opposing cortical surface along the femoral neck axis. Apparent femoral head diameter (DH*) was measured by fitting a circle to the articular surface. b True femoral neck length and femoral head diameter were measured on the magnetic resonance image in the sagittal plane of the femur and compared to the corresponding radiographic measurementsBack to article page