## 4 Discussion
So far, the authors who have developed similar programs in the past have also noted the difficulty of designing gestures to best fit the computer screen by controlling the mouse on the other. They reported that gestures were intuitive for people using the device [14; 17; 40]. In this study, respondents--surgeons emphasized the most significant advantage of the present system, PACS hands-free access in the OR, which, in their opinion, can lead to asignificant reduction in staff present in the operating room and will be an additional factor in reducing the possibility of contamination spreading [42; 43]. Traffic reduction in the OR is commonly considered a factor that reduces the risk of infection [44; 45; 43]. Eliminating the causes of the lack of concentration loss during the work of an orthopedic surgeon contributes to increasing the safety of the patient operated on in the operating room while reducing the working time. This conclusion is in line with that provided by [PERSON] et al. [14], describing the dependence of the duration of the operation on the amount of verbal interaction between the surgeon and the other people in the operating room. Analyzing the answers, the surgeons pointed out the importance of contactless computer use in the OR for retrieving images stored in the PACS and videoconferencing systems while working there. Surgeons participating in the ORTHO_KINECT_OR application tests confirmed that they would recommend this device to other orthopedic surgeons. The weak point of the current project is the minimal number of surveyed surgeons, which does not allow for more advanced statistical analyses. However, given the very high agreement of the opinions obtained after completing the ORTHO_KINECT_OR application tests in the operating room, it may be assumed that the opinions among a larger population of orthopedic surgeons would be similar. The number of participants in similar studies was never higher than thirty and usually around ten or less [14; 17; 40]. Other researchers did not report the number of study participants [38]. The research demonstrated the usability and satisfaction of users using the ORTHO_KINECT_OR prototype application with the Kinect sensor. It is reasonable to assume that Microsoft Kinect technology may increase the use of intraoperative imaging previews. Touchless performance of tasks on monitors providing access to PACS and video-conferencing systems improves the safety of surgical patients in the operating room by better maintaining the sterility of the operating room, eliminating staff traffic, and reducing the distraction of the operating team at the workplace. The readability, transparency, and quality of use of the created program on a scale from 1 (the lowest rating) to 10 (the highest rating) were rated on average as 7. The navigation quality was rated indirectly due to the lack of need for many tools enabling contactless, self-service devices in the operating room environment. The aspect of reducing the risk of contamination in the OR field was understood. The development of human-computer interaction should be continued to improve the quality and safety of work in the operating room. Some project vulnerabilities differ from threats because they are internal to the project and can be controlled or eliminated. This feasibility study also aimed to determine whether the project should continue or be redesigned. It was stated that for the preparation of the feasibility study, selected fragments of the study were sufficient to determine the application's usefulness in surgical practice due to the complementary nature of the usability provided by the designed application. It should be noted that the production of the Kinect sensor has been discontinued in its current form and is now called Kinect Azure, which is available in stock. This device can be considered an extended version on which the next updated application version can be based. Several medical applications are continuing on Kinect Azure [35; 36; 37].