Tibiofemoral movement 2: the loaded and unloaded living knee studied by MRI

In 13 unloaded living knees we confirmed the findings previously obtained i n the unloaded cadaver knee during flexion and external rotation/internal r otation using MRI. In seven loaded living knees with the subjects squatting , the relative tibiofemoral movements were similar to those in the unloaded knee except that the medial femoral condyle tended to move about 4 mm forw ards with flexion. Four of the seven loaded knees were studied during flexi on in external and internal rotation. As predicted, flexion (squatting) wit h the tibia in external rotation suppressed the internal rotation of the ti bia which had been observed during unloaded flexion.