294 Chapter 11 section) for Kinovea measurements lead to a relative high number of exclusions. The Kinovea analysis could only be performed when the catheter (reference point) was visible during apical dissection. There is some variation in the placement of the reference line since the diameter of the catheter was sometimes measured in less than ideal circumstances, meaning that not the entire circumference of the catheter was visible during measurement. There is also a possibility of variation in the length and width measurements due to the amount of traction on the tissue during dissection, in order to reduce this variation, the measurements were taken at the same point in the dissection of the urethral stump. The angle of the camera during measurement could influence the results of the measurement, but since the reference line was measured with the camera in the same position as the measurements of the urethra we believe this influence is negligible. The use of an intraoperative object with a known size or a ruler to measure the urethral stump could result in more accurate measurements of the urethral stump. In this study the measurements were taken by a single observer. This study was performed in cases of a single surgeon, results in multiple surgeons could vary due to variability of surgical technique. Further research of the implications of urethral stump length could result in an improvement of postoperative continence for individual patients. If the measurement of the urethral length can be performed during surgery it will be possible to adjust surgical techniques to preserve the maximal surgical urethral length.
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