307 Analysis of the video motion tracking system ‘Kinovea’ to assess surgical movements during robot-assisted radical prostatectomy. The tracked instrument controlled by the right robotic arm in the majority of measurements was the Intuitive Surgical Hot Shears (Mono-polar Curved Scissors). This instrument had a jaw length of 1.3 cm, which was used by the researcher to be able to calibrate the motion tracking software in order to approximate the total distance the surgical instrument has travelled (Fig. 1A). In a few video fragments the Intuitive Surgical Large Needle Driver was used by the right robotic arm. In this case, calibration was done by the researcher using this instrument’s jaw length, consisting of 1 cm (Fig. 1B). After calibration the researcher only had to manually place a tracking point on the instrument’s first joint and press play, the Kinovea software was designed to be able to follow this tracking point during the procedure based on the selected pixels. The entire surgical procedure from the opening of the peritoneum to the completion of the bladder-urethra anastomosis was automatically tracked by the software (Fig. 1A, Fig. 1: A) Example of a calibration line (orange line) and tracking point on the Mono-polar Curved Scissors. B) Example of a calibration line on the Large Needle Driver, the purple line is the movement pattern of the instrument. C) Example of a tracking point on the Large Needle Driver, the green line is the movement pattern of the instrument.
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