Fig. 1

A The geometric centre of the tibial plateau (gCTP), obtained per the ellipse tool, was used as the centre of a circle. B The circle and the anterior cortex had two intersections. The section between these points was halved and the latter was connected to the gCTP, providing the sagittal axis of the tibial metaphysis. C The line perpendicular to the former and running through the gCTP, was the longer axis of the metaphysis (LAM). The gCTP, the sagittal axis and the LAM were transposed to the slice containing the periosteum-ligament connection. Two lines were created parallel to the sagittal axis and tangential to the medial (MBPT) and the lateral (LBPT) border of the patellar tendon. A perpendicular line was drawn to the MBPT and the LBPT, tangential to the midpoint of the MBPT and the LBPT, whose intersection with the anterior cortex was determined (CIP). A perpendicular line was emitted from the CIP to the LAM, and the intersection with the LAM was named LAMI. The angle measurement tool was used to evaluate the gCTP-CIP-LAMI angle