289 Identifying the relationship between postoperative urinary continence and residual urethra stump measurements in robot assisted radical prostatectomy patients Table 3. Difference in pre-operative MRI measurements (MUL, VUL, MUW, and VUW) and surgical urethral measurements with Kinovea software (SUL and SUW) during apical dissection between continent and incontinent patients. Postoperative incontinent patients (ICIQ-SF>10) (n=7) Median (min - max) Postoperative continent patients (ICIQ-SF=0) (n=26) Median (min - max) P-value MUL, length (in mm) of the membranous urethra from the apex of the prostate to the bulbus (midsagittal T2) 9.87 (8.69 – 12.97) 13.18 (9.63 – 16.15) 0.001 VUL. Ventral Urethral length, measured from apex of prostate to the pelvic floor muscles (coronal T2-weighted) 6.47 (3.75 - 10.35) 10.74 (5.79 – 14.50) 0.009 VUW, Ventral Urethral width, defined as maximal diameter of urethra at the location of the VUL measurement (axial T2) 12.97 (11.13 – 14.86) 12.38 (9.96 – 13.81) 0.268 MUW, Maximal Urethral Width, defined as maximal diameter of urethra (axial T2) 12.12 (9.22 – 13.15) 11.61 (9.05 – 14.00) 0.914 Surgical urethral length (SUL), mm 10.50 (5.06 – 12.79) 12.94 (6.10 – 24.35) 0.018* Surgical Urethral Width (SUW), mm 6.83 (1.95 – 11.13) 7.37 (4.26 – 16.78) 0.450
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