Our procedure was as follows. In the first place, all students were randomly assigned to two different groups. The first group was formed by 31 students, whereas the second one had 45 students. Note that all participants were 2nd year students, who had already acquired basic theoretical knowledge of anatomy during the previous academic year. Therefore, in order to access the comparability of both groups, we studied the averaged qualifications obtained by these students in several 1st year basic subjects. These subjects are related to anatomy and required for enrolling in the subject that we are evaluating. Table 1 provides this information. From this Table, we observe that there were no statistically significant differences in the knowledge tests carried out by both groups approximately two months before our intervention. Therefore, using this information as a baseline we can conclude that both groups were homogeneous and comparable in their academic performance and previous knowledge of anatomy.
Once the groups were formed, we carried out our evaluation during two practical lessons of 5 h each. During the first session, manual therapy was taught in relation to the knee and the ankle. The volumetric models used in this lesson are shown in Figs. 3a and 5, respectively. For the knee the 2D view was used, whereas we employed the 3D view for the ankle. The second session was about the pelvic zone. In this case, the 3D view was used, as shown in Fig. 2.