Fig. 4.

Materials and test setting-up. (a) Low friction sliding support to apply purely vertical forces. (b) Specimen before mounting to hydraulic press. (c) Specimen under test: the lateral and the medial sensor (LS and MS) registered the relative lateral and medial vertical displacements from the tibial head, while VS measured its vertical displacement. The DX, DY1 and DY2 sensors registered the horizontal displacements of the tibial head; along the transverse axis for the first and the sagittal axis for the latters