This app is a great idea and a novel integration of technology that uses the camera, touch screen, and computational power to help surgeons measure hallux valgus angles based on an xray. The app first presents the user with a drawing of a foot and identifies the intermetatarsal angle, the distal metatarsal angle, and the hallux valgus angle. The user selects which angle to measure, and the app pulls up the camera and prompts the user to align the screen with the metatarsal or phalangeal shafts. It then calculates the angle and presents them on the initial drawing with the option to save and email the image, if desired. Overall, the app is a great idea and smooth mixing of technologies. Unfortunately, making the angle measurement dependent on the user’s ability to hold still and keep the camera a constant distance from the image, which has the potential to introduce “noise” into the calculation. Because most PACS systems are now well-equipped to measure angles, this app is not useful to individuals who use electronic imaging. However, for someone with printed xrays and without a protractor, this app can provide an objective measurement for an otherwise subjective assessment.
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