Usability questionnaires
Due to the prototype stage of the RobExReha device, we anticipated lower usability in the QUEST when compared to the Armeo Reference Group. However, this was only confirmed for the overall score and the items “reliability and safety” and “easy to use”. Yet, usability was generally rated positive by the patients in all questionnaires. Moreover, the mean QUEST score seems reasonable for a newly developed device, as it is comparable to the results from Guillén-Climent et al. who examined the usability of another novel rehabilitation device for upper extremity using robotics and serious gaming [Features largely contributing to these lower ratings were the hand module (insufficient adjustability of length and wrist positions), the upper part of the arm orthosis (discomfort) and the HoloLens (too heavy or ill-fitting). The first two issues could be addressed during further developmental iterations of the robotic interface. Concerning the AR glasses, the HoloLens 2 (Microsoft Corp., US), might offer a greater field of view and improved comfortability. Additionally, the categories “reliability” and “safety” should be assessed separately in future evaluations, as lower perceived reliability largely contributed to the low ratings of this item, and no patient mentioned feeling unsafe at any moment.