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Evaluation of the bony pelvis in classic bladder exstrophy by using 3D-CT: further insights

A A Stec1, H K Pannu, Y E Tadros

  • 1Department of Urology, Division of Pediatric Urology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA.

Urology
|December 18, 2001
PubMed

Insights

Children with classic bladder exstrophy have significantly altered pelvic dimensions and orientation compared to controls. This study reveals previously unknown pelvic rotation and sacroiliac joint orientation, crucial for surgical planning.

Area of Science:

  • Pediatric Orthopedics
  • Developmental Biology
  • Medical Imaging

Background:

  • Classic bladder exstrophy is a complex congenital condition affecting pelvic development.
  • Understanding the detailed bony pelvic anatomy in these patients is essential for effective surgical management.
  • Previous studies have not fully elucidated the three-dimensional pelvic morphology in classic bladder exstrophy.

Purpose of the Study:

  • To comprehensively analyze the dimensions, orientation, and relationships of the bony pelvis in children with classic bladder exstrophy.
  • To establish normative data for pelvic parameters in this patient population.
  • To identify specific bony pelvic alterations associated with classic bladder exstrophy.

Main Methods:

  • Utilized three-dimensional computed tomography (3D CT) to assess pelvic anatomy.
  • Included 7 pediatric patients (6 boys, 1 girl) with classic bladder exstrophy, some undergoing primary or reclosure surgery.
  • Compared pelvic measurements and angles of exstrophy cases with 26 age and sex-matched controls.

Main Results:

  • Exstrophy pelves exhibited a significantly larger iliac wing angle (11.4 degrees) and more external rotation of the sacroiliac joint (9.9 degrees).
  • The pelvis in exstrophy cases was rotated 14.7 degrees in the superoinferior plane.
  • Mean pubic diastasis was 4.2 cm (vs. 0.6 cm in controls), and inter-triradiate distance averaged 6.0 cm (vs. 4.2 cm in controls).

Conclusions:

  • This study provides novel insights into the bony pelvis, particularly the posterior structures, in classic bladder exstrophy.
  • Demonstrated more external orientation of sacroiliac joints and inferior pelvic rotation than previously recognized.
  • These findings are critical for optimizing surgical planning, including osteotomies and pelvic reconstruction, in patients with classic bladder exstrophy.
Abstract

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