3D pelvimetry and biometric measurements: a surgical perspective for colorectal resections

Laura Lorenzon, Fabiano Bini, Federica Landolfi, Serena Quinzi, Genoveffa Balducci, Franco Marinozzi, Alberto Biondi, Roberto Persiani, Domenico D'Ugo, Flavio Tirelli, Elsa Iannicelli

Risultato della ricerca: Contributo in rivistaArticolo in rivista


Purpose: Male sex, high BMI, narrow pelvis, and bulky mesorectum were acknowledged as clinical variables correlated with a difficult pelvic dissection in colorectal surgery. This paper aimed at comparing pelvic biometric measurements in female and male patients and at providing a perspective on how pelvimetry segmentation may help in visualizing mesorectal distribution. Methods: A 3D software was used for segmentation of DICOM data of consecutive patients aged 60 years, who underwent elective abdominal CT scan. The following measurements were estimated: pelvic inlet, outlet, and depth; pubic tubercle height; distances from the promontory to the coccyx and to S3/S4; distance from S3/S4 to coccyx’s tip; ischial spines distance; pelvic tilt; offset angle; pelvic inlet angle; angle between the inlet/sacral promontory/coccyx; angle between the promontory/coccyx/pelvic outlet; S3 angle; and pelvic inlet to pelvic depth ratio. The measurements were compared in males and females using statistical analyses. Results: Two-hundred patients (M/F 1:1) were analyzed. Out of 21 pelvimetry measurements, 19 of them documented a significant mean difference between groups. Specifically, female patients had a significantly wider pelvic inlet and outlet but a shorter pelvic depth, and promontory/sacral/coccyx distances, resulting in an augmented inlet/depth ratio when comparing with males (p < 0.0001). The sole exceptions were the straight conjugate (p = 0.06) and S3 angle (p = 0.17). 3D segmentation provided a perspective of the mesorectum distribution according to the pelvic shape. Conclusion: Significant differences in the structure of pelvis exist in males and females. Surgeons must be aware of the pelvic shape when approaching the rectum.
Lingua originaleEnglish
pagine (da-a)1-50
Numero di pagine50
RivistaInternational Journal of Colorectal Disease
Stato di pubblicazionePubblicato - 2020


  • 3D imaging
  • Rectal cancer
  • TaTME
  • Total mesorectal excision


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