title: Phantom movements from physiologically inappropriate muscles: A case study with a high transhumeral amputee.
abstract: Individuals with high-level amputation have a great need for functional prostheses because of their vast functional deficits. Conventional techniques are considered inappropriate for high-level amputees due to the lack of physiologically appropriate muscles. This study investigates how accurate phantom movements (PMs) can be classified from physiologically inappropriate muscles. The study involves a case study of a 42-year-old transhumeral amputee. Suitable PMs and best electrode configuration were identified using the sequential forward selection method and brute-force technique. Using linear discriminant analysis, the best PMs (elbow extension/flexion, wrist supination/pronation) and rest were classified with error ranging from 3% to 0.18% when using 3 to 8 EMG channels respectively. A completion rate of 93 % was obtained during a targeted achievement control test in a virtual reality environment. This case indicates that a proximal transhumeral amputee can generate muscle activation patterns related to distinct PMs; and these PMs can be decoded from physiologically inappropriate muscles.
authors.forename: Julie
authors.initials: J
authors.lastname: Gade
authors.forename: Rosa
authors.initials: R
authors.lastname: Hugosdottir
authors.forename: Ernest N
authors.initials: EN
authors.lastname: Kamavuako
mesh_terms: D000328:Adult; D000674:Amputees; D004566:Electrodes; D004576:Electromyography; D006801:Humans; D006811:Humerus / Q000601:surgery*; D008297:Male; D009068:Movement; D009132:Muscles / Q000503:physiopathology*; D019047:Phantoms, Imaging