Posterior femoral condylar morphology. The axial MRI slice showing the complete femoral trochlea with cartilage and intact posterior femoral condyles is selected. The posterior femoral condyle reference line (PCRL) and the surgical transepicondylar axis (SEA) are shown. The width of the SEA (TEW), the distance between the SEA and the posterior cartilaginous margin of the lateral condyle (LPD) and medial condyle (MPD) are measured. The posterior condylar angle (PCA) is the angle between the SEA and PCRL.