End stage neurogenic lower urinary tract dysfunction poses a severe risk of progressive renal deterioration secondary to chronically high intravesical pressures. When conservative management fails, augmentation cystoplasty and incontinent ileal conduit diversion serve as primary definitive surgical interventions. This study aimed to comprehensively evaluate and compare their efficacy in achieving long term renal preservation and structural morbidity over extended follow up periods.

This study was conducted in strict accordance with PRISMA guidelines and registered on PROSPERO. A systematic literature search across six major electronic databases (PubMed, Scopus, ProQuest, Cochrane Library, MedRxiv, and Google Scholar) was executed up to March 2026. The review included primary observational studies reporting quantitative urodynamic parameters or renal outcomes for patients undergoing either augmentation cystoplasty or incontinent ileal conduit diversion. Data synthesis was performed using a proportional random effects meta analysis to determine the pooled prevalence of renal preservation, alongside a continuous moderator meta regression to evaluate structural complication rates over time.

Eleven studies met the rigorous inclusion criteria and were synthesized quantitatively. For the augmentation cystoplasty cohort (seven studies), the proportional meta analysis demonstrated a pooled prevalence of stable or improved renal function of 84% (95% CI: 74% to 91%, I2 = 82%) (Figure 1.). This intervention yielded massive improvements in bladder capacity, albeit requiring absolute adherence to clean intermittent catheterization (CIC). Conversely, the meta regression of the incontinent ileal conduit cohort (four studies) revealed a highly significant time dependent escalation in late anatomical morbidity. Overall complications, primarily ureteroenteric strictures, increased linearly from approximately 42% at a mean follow up of 1.9 years, to 82% at 13.3 years, peaking at over 94% in cohorts exceeding 15 years (Figure 2.).

The synthesis of these cohorts highlights a pronounced clinical dichotomy in reconstructive urology. Augmentation cystoplasty demonstrates robust long-term protection for the kidneys and a significant larger bladder capacity, but it requires a strict, lifelong adherence to CIC. In contrast, while incontinent ileal conduit diversion obviates the necessity for CIC, its longitudinal risk profile exhibits a highly progressive, time-dependent deterioration of anatomical integrity, culminating in a nearly universal incidence of severe stricture-related morbidity at extended follow-up (>15 years).

The results present a clear clinical trade-off that the management of these patients necessitates highly individualized surgical selection, requiring clinicians to carefully weigh a patient's capacity for rigorous CIC compliance against their risk tolerance for delayed anatomical deterioration. Furthermore, regardless of the chosen diversion modality, these findings underscore the absolute imperative for protocolized lifelong surveillance to proactively identify, intercept, and manage both renal functional decline and progressive structural morbidities over the patient's lifespan.

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