Every year, 2.5 million people suffer from an injury to knee, most of them to the Anterior Cruciate Ligament. After this patient need to undergo a painful and lonely rehabilitation period of at least 9 to 12 months. Meet Ara, the smart rehabilitation bracelet. Ara continuously monitors the injured knee to provide an increased amount of insights which enables practitioners to take humanized, and data driven decisions to personalize the rehabilitation plan for each individual. It empowers patients to take an active role in their own rehabilitation by providing live and precise feedback on their activities throughout the day.