Challenges
Is acceptable, practical and beneficial assistance of an operator even possible with the help of a smartphone app? In fact, just a single photograph (with no perspective distortions) of an X-ray image of a knee surgery patient is sufficient to virtually draw the corresponding guide lines for the drill channel position calculation in the app. It turned out that the precision was superior to the usual (non-digital) methods currently used in surgical practice. In the further development of the app, the focus was on simple and error-avoiding operation when setting the guide lines.
