Construction of a nomogram model to predict technical difficulty in performing laparoscopic sphincter-preserving radical resection for rectal cancer

Figure 1 Localization diagrams of the highest point of the pubic symphysis during three-dimensional pelvic measurement. A: Localization of the highest point of the pubic symphysis during three-dimensional measurement of the pelvis; B: Localization of the intersection of two axes in the transverse plane, i.e., the corresponding measurement point; C: Localization of the intersection of two axes in the median sagittal plane, i.e., the corresponding measurement point; D: Localization of the intersection of two axes in the coronal plane, i.e., the corresponding measurement point.