Figure 1.

Overview of the test configuration and data acquisition systems. The top part (a) shows the test session where motion was measured: the spine segment with the markers (three on each vertebra) is visible on the left. The spine tester and four of the six cameras of Vicon system are visible on the right. The bottom part (b) shows the session where strains were measured: the specimen with the white-on-black speckle pattern for the DIC analysis is visible on the left. The field of view recorded by the DIC cameras is indicated. On the right, the specimen mounted in the spine tester in front of the DIC system is shown.