ILIAC OSTEOTOMY - A MODEL TO COMPARE THE OPTIONS IN BLADDER AND CLOACAL EXSTROPHY RECONSTRUCTION

Bladder exstrophy and cloacal exstrophy present challenging reconstruc tive problems. Traditionally, bilateral posterior iliac osteotomy has been performed in the majority of patients undergoing primary closure for these abnormalities. Recently, 2 anterior osteotomy approaches hav e been proposed: 1) incision of the ilium transversely above the aceta bulum (transverse osteotomy) and 2) incision of the superior ramus of the pubis (superior ramus osteotomy). We devised a new anterior mid-il iac diagonal osteotomy that provides a more functional pelvic closure. To provide a fair comparison of the procedures we developed a pelvic exstrophy model based on data from a 3-dimensional computerized tomogr am of a 3-year-old patient with classical bladder exstrophy. The diffe rent osteotomies were then performed on the model and the results were compared. Our new anterior mid-iliac diagonal osteotomy correction al lowed the best surgical approach, provided the best correction of the flattened ilia bony deformities, was performed in the thinnest area of marrow bone and resulted in the best pelvic symmetry.