Is Immobilization Technique Associated With Postoperative Pubic Rami Diastasis Following Bladder Exstrophy Closure?

Objective: Pelvic osteotomies relieve tension of the bladder and fascial closures during bladder exstrophy repair. Multiple techniques for postoperative immobilization of the pelvis and lower extremities have been described. The primary aim of this study was to assess differences in short and long-term changes in pubic rami diastasis when comparing Bryant traction to spica cast immobilization. Secondary aims included a comparison of length of stay, skin-related complications, and urologic outcomes. Methods: We performed a single-institutional retrospective review of bladder exstrophy patients younger than 18 months of age who underwent posterior pelvic osteotomy and bladder exstrophy closure from April 2005 to April 2020. Short-term and long-term pubic rami diastasis were defined as postoperative measurements ≤6 months and ≥12 months, respectively. Secondary outcomes included length of stay, pressure ulcer, skin rash/abrasion, urethrocutaneous fistula, and bladder or fascial dehiscence rates. Multivariable logistic regression assessed for an association between immobilization type and degree of diastasis while controlling for age at the time of diastasis measurement and sex. Results: Fifteen patients underwent Bryant traction and 36 patients underwent spica cast immobilization. In both the short-term and long-term, there was a greater reduction in pubic diastasis in the spica cast group (P= 0.002 and P= 0.05, respectively). After adjustments, there were higher odds of having a greater reduction in pubic rami diastasis in both the short-term (odds ratio: 2.71, 95% CI: 1.52-4.86, P= 0.001) and long-term (odds ratio: 2.41, 95% CI: 1.00-5.80, P= 0.05). Length of stay was significantly higher in Bryant’s traction group (26 vs 19 d, P< 0.001). Rates of pressure ulcers were higher in the Bryant traction group (26.7% vs 0%, P= 0.005). Rates of skin rash/abrasions, urethrocutaneous fistula, and bladder/fascial dehiscence did not differ. Conclusions: Spica cast immobilization is a safe and effective immobilization method. Compared with Bryant traction, spica cast immobilization was associated with a greater reduction in postoperative pubic diastasis both short and long-term, along with a shorter length of hospitalization and reduced rate of pressure ulcers. Level of Evidence: Level III—therapeutic study.