Prediction of urinary incontinence by sarcopenia-associated factors and membranous urethral length after robot assisted radical prostatectomy

Abstract

  We assessed sarcopenia-associated factors and anatomical factors to predict postoperative urinary incontinence in robot-assisted radical prostatectomy (RARP). We included 65 cases who underwent RARP from June 2015 to May 2017. Before surgery, we evaluate QOL, amount of urinary incontinence, grip strength and 3 meters timed up & go test (TUG). Membranous urethral length (MUL) was measured by preoperative MRI. In univariate analysis, the usage of the safety pad at 3 months after surgery significantly correlated with the MUL (p＝0.0264). In multivariate analysis, we picked up age, grip strength, TUG, nerve sparing, and MUL, MUL ≥ 13 mm was the only significant predictor of postoperative incontinence (p＝0.0313). Although sarcopenia evaluation might be considered for further investigation, MUL evaluation before RARP seems to be useful for treatment selection and procedure determination in predicting postoperative early phase urinary incontinence.