Mochizuki Y, et al. - Researchers conducted this study to further develop the quadrant method measuring four points, which they named four-point quadrant method, and to compare with the quadrant method. High intra- and inter-observer reliability and accuracy of the four-point quadrant method was highlighted in findings. Data showed that this method can evaluate the tunnel position regardless of the shape and morphology of the bone tunnel aperture for use of comparison and can provide measurement that can be compared with various reconstruction methods. Overall, this method is a detailed and accurate tool for assessing femoral tunnel position after anterior cruciate ligament (ACL) reconstruction and hence considered as clinically relevant.