Quantifying Prosthetic and Intact Limb Use in Upper Limb Amputees via Egocentric Video: An Unsupervised, At-Home Study

Analysis of the manipulation strategies employed by upper-limb prosthetic device users can provide valuable insights into shortcomings current technology or therapeutic interventions. Typically, this problem has been approached with survey lab-based studies, whose prehensile-grasp-focused results do not necessarily give accurate representations daily activity. In work, we capture prosthesis-user behavior in unstructured and familiar environments participants own homes. Compact head-mounted video cameras recorded ego-centric views hands during self-selected household chores. Over 60 hours was from 8 persons unilateral amputation limb difference (6 transradial, 1 transhumeral, shoulder). Of this, almost 16 data analyzed human experts using 22-category `TULIP' custom taxonomy, producing type duration over 27,000 prehensile non-prehensile tags on both upper limbs, permitting a level objective analysis previously possible population. Our included unique observations manipulations occurrence, determining that 79% transradial body-powered were non-prehensile, compared to 60% for myoelectric devices. Conversely, only 16-19% intact activity non-prehensile. Additionally, multi-grasp terminal devices did lead increased 1DOF