The effect of a three-dimensional instructional video on performance of a spatially complex procedure in surgical residents in relation to their visual-spatial abilities.

Abstract Background The effect of three-dimensional (3D) vs. two-dimensional (2D) video on performance of a spatially complex procedure and perceived cognitive load were examined among residents in relation to their visual-spatial abilities (VSA). Methods In a randomized controlled trial, 108 surgical residents performed a 5-Flap Z-plasty on a simulation model after watching the instructional video either in a 3D or 2D mode. Outcomes included perceived cognitive load measured by NASA-TLX questionnaire, task performance assessed using Observational Clinical Human Reliability Analysis and the percentage of achieved safe lengthening of the scar. Results No significant differences were found between groups. However, when accounted for VSA, safe lengthening was achieved significantly more often in the 3D group and only among individuals with high VSA (OR = 6.67, 95%CI: 1.23–35.9, p = .027). Conclusions Overall, 3D instructional videos are as effective as 2D videos. However, they can be effectively used to enhance learning in high VSA residents.