Fig. 1.From: High validity of measuring the width and volume of medial meniscal extrusion three-dimensionally using an MRI-derived tibial modelA local coordinate system of the tibia using the CT-derived tibial model. Tibial coordinate system is embedded using a virtual rectangle fitted onto the tibial cross section at the top of the fibular notch level. Then, the fitted rectangle is translated superiorly to the bottom of the medial and lateral tibial plateausBack to article page