Representation and location of measurement element. Schematic view and location of MEs. A1 and A2: Schematic view of the ME. A3: ME used in this study including a Strain Gage. B and C: 3D representation (obtained from medical imaging) of ME locations in the proximal epiphysis of the tibia. ME1 and ME6: most anterior edge of the medial and lateral condyles, respectively; ME2: most medial point of the medial condyle, ME3 and ME4 = most posterior edge of the medial and lateral condyles, respectively. M5: most lateral point of the lateral condyle (tunnels were drilled 10 mm below these landmarks, see text for further details).