Fig. 1From: Application of the combination of three-dimensional visualization with a problem-based learning mode of teaching to spinal surgery teachinga Back view and b Side view. c The L1, L3 and pelvis of the model were transparent. d Combining the CT cross-sectional image with the model, you can slide up and down to adjust different CT planes. e CT sagittal image combining the model and processes L1 and L3 with hidden instructionsBack to article page