Three-dimensional anatomy of the pelvic bone in bladder exstrophy: comparison between patients managed with osteotomy and pubic symphysis internal fixation using metal plates.
OBJECTIVE
To compare intrapelvic osseous dimensions in classic bladder exstrophy patients who underwent pelvic osteotomy and pubic symphysis internal fixation, using metal plates without osteotomy by defining intrapelvic angles and distances using three-dimensional computed tomography scan (3D-CT).


METHODS
Fourteen exstrophy patients who were operated with osteotomy (OST) and 19 patients who had undergone pubic approximation using metal plates (PLT) were enrolled in this study. 3D-CT was performed to measure 8 intrapelvic angles and 9 distances. In addition, a 3D-CT image of control group of 14 age- and sex-matched patients and the preoperative data of 12 cases (6 patients in each group) were considered to compare the bony aspects of exstrophy patients before and 6 months after surgery.


RESULTS
Sacroiliac joint angle, pubococcygeal angle, ischiopubic angle, pubic diastasis, and inter-triradiate distance were different from controls in both techniques. Iliac wing angle, however, was at near normal values in PLT group. The result of before-after comparison revealed significant changes in iliac wing angle, sacroiliac joint angle, and pubic diastasis in both groups.


CONCLUSIONS
Our study suggests that internal fixation of pubic arch using metal plates in bladder exstrophy may be as effective as the currently accepted osteotomy-containing techniques from the standpoint of intrapelvic osseous dimensions and angles. Modification of our new pubic approximation technique is essential to better recapitulate the anatomy of the normal bony pelvis.
Kajbafzadeh
Abdol-Mohammad
AM
Pediatric Urology Research Center, Children's Hospital, Medical Center, Tehran University of Medical Sciences, Tehran, Islamic Republic of Iran. kajbafzd@sina.tums.ac.ir
Tanhaeivash
Roozbeh
R
Elmi
Azadeh
A
Shirazi
Mehdi
M
Talab
Saman Shafaat
SS
Shabestari
Abbas Arjmand
AA
D000886:Anthropometry; D001746:Bladder Exstrophy / Q000601:surgery*; D001860:Bone Plates; D002675:Child, Preschool; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007223:Infant; D007231:Infant, Newborn; D016268:Internal Fixators; D008297:Male; D010027:Osteotomy; D010384:Pelvic Bones / Q000000981:diagnostic imaging* / Q000473:pathology; D011631:Pubic Symphysis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D013536:Suture Techniques; D036542:Tomography, Spiral Computed / Q000379:methods*