Abstract Background: Augmentation cystoplasty is one of the surgical procedure for treatment of spastic neurogenic bladder that has a significant improvement in the cystometric parameters. Aim of study: The aim of this study is to describe cystometric findings pre and post augmentation cystoplasty in patients with spastic neurogenic bladder. Patients and methods: A prospective study including patients aged 6-18years with neurogenic bladder operated on for augmentation cystoplasty surgery with ilium segments due to a neurogenic bladder from the years 2020–2024. A urodynamic study was conducted before and 3 months after the surgical procedure. Non-probabilistic sample of consecutive cases. Descriptive statistics were presented using frequencies and percentages, as well as medians and ranges. Inferential intra-group comparisons were conducted using the Wilcoxon test and analyzed with the SPSS 20.0 statistical software package Results: The study included 80 patients, of whom 40 were male and 40were female, with a median age of 14 years (range, 6–18years). Bladder capacity improved from 50.3% to 92.4% of the expected bladder capacity (p<0.0001), but the no. of uninhibited contractions per filling increased from 1.2 to1.9, the contraction intensity decreased from 39 to 10.7 cm H2O (p<0.0001), mean pre-surgical and post-surgical filling pressure 35.7cmH2O and 12cmH2O respectively (p<0.0001), mean detrusor leak point pressure decreased from 42.5 to 3.3cmH2O (p<0.0001), and bladder compliance increased from3.3 to 42.5cmH2O (p<0.001). Conclusion: Augmentation cystoplasty with ilium significantly improved urodynamic parameters, such as bladder capacity, compliance, leakage point pressure and filling pressure in patients with neurogenic bladder.