In a recently accepted abstract, we discovered that omitting the cortical closure (n=28) resulted in a 0.8% loss in glomerular filtration rate while using the closure resulted in a 7.3% loss (p=0.03). Following this discovery a 3D modeling project was performed to isolate the volume loss in operated kidneys using pre- and postoperative CT scans (not yet published). In this study, we discovered a 15% volume loss with cortical closure (n=38) compared to only a 5% loss without closure (n=20, p < 0.001).