Mixed reality has begun to find applications in new areas as hardware, from smart phones to head mounted displays, have become more widespread, powerful and affordable. Research on effectiveness, acceptability and other issues related to the use of these technologies have been carried out in different contexts. While more work remains to be done, it is possible to envision new cross disciplinary applications with the potential to be highly effective. which would not have been possible without results from these different research streams. This paper will examine the use of augmented reality in the context of upper limb rehabilitation. Related research on the perceived accuracy and validity of of augmented (and tangible augmented) reality, integration with external sensors, supporting product-service-systems and customization will be examined. Potential applications to upper limb rehabilitation will be discussed and open issues highlighted.