Must Clinics Replace 2D by 3D Environments for an Efficient Training of Laparoscopic Novices? A Critical Analysis of the Learning Curve for Basic Skills.

Background And Aims: Published studies repeatedly demonstrate an advantage of three-dimensional (3D) laparoscopic surgery over two-dimensional (2D) systems but with quite heterogeneous results. This raises the question whether clinics must replace 2D technologies to ensure effective training of future surgeons.

Methods: We recruited 45 students with no experience in laparoscopic surgery and comparable characteristics in terms of vision and frequency of video game usage. The students were randomly allocated to 3D ( = 23) or 2D ( = 22) groups and performed 10 runs of a laparoscopic "peg transfer" task in the Luebeck Toolbox. A repeated-measures ANOVA for operation times and a generalized linear mixed model for error rates were calculated. The main effects of laparoscopic condition and run, as well as the interaction term between the two, were examined.

Results: No statistically significant differences in operation times and error rates were observed between 2D and 3D groups ( = 0.10 and = 0.72, respectively). The learning curve showed a significant reduction in operation time and error rates (both 's < 0.001). No significant interactions between group and run were detected (operation time: = 0.342, error rates: = 0.83). With respect to both endpoints studied, the learning curves reached their plateau at the 7th run.

Conclusion: The result of our study with laparoscopic novices revealed no significant difference between 2D and 3D technology with respect to performance time and the error rate in a simple standardized test. In the future, surgeons may thus still be trained in both techniques.