Holliston

Researchers are evaluating how different myoelectric control settings affect the functional performance of individuals aged 18 years or older with upper limb absence at the transradial level. This study aims to test whether common assumptions about the number and placement of muscle sensors translate to real-world use when wearing a physical prosthesis. The study focuses on functional outcomes such as the Assessment of Capacity for Myoelectric Control ACMC and other performance tests to understand prosthesis control better. Participants will be part of a randomized crossover study comparing four different sensor channel conditions 4 untargeted channels, 8 untargeted channels, up to 16 untargeted channels, and 8 targeted channels. Experimental sockets with these configurations will be custom-made for each participant. The Coapt Pattern Recognition control system and Coapt EMG Cuff device will be used for both in-lab testing and at-home practice. Between visits, participants will play virtual games with the EMG Cuff to improve muscle control. Participants will attend up to five in-lab sessions lasting about four hours each, spaced 1 to 2 weeks apart. During visits, they will wear the assigned socket, complete training and functional outcome tests like the ACMC, and provide feedback through surveys. The study includes monitoring during sessions, optional breaks, and potential additional visits if needed. The total study duration depends on participant scheduling and adherence to the virtual training program at home.