Abstract
(1) Background: This study investigated the feasibility of conducting a two-week “real-world” trial of the Self Grasping Hand (SGH), a novel 3D printed passive adjustable prosthesis for hand absence; (2) Methods: Single-group pilot study of nine adults with trans-radial limb absence; five used body-powered split-hooks, and four had passive cosmetic hands as their usual prosthesis. Data from activity monitors were used to measure wear time and bilateral activity. At the end of the two-week trial, function and satisfaction were measured using the Orthotics and Prosthetics Users’ Survey Function Scale (OPUS) and the prosthesis satisfaction sub-scales of the Trinity Amputations and Prosthesis Experience Scale (TAPES). Semi-structured interviews captured consumer feedback and suggestions for improvement; (3) Results: Average SGH wear time over 2 weeks was 17.5 h (10% of total prosthesis wear time) for split-hook users and 83.5 h (63% of total prosthesis wear time) for cosmetic hand users. Mean satisfaction was 5.2/10, and mean function score was 47.9/100; (4) Two-week real-world consumer testing of the SGH is feasible using the methods described. Future SGH designs need to be more robust with easier grasp lock/unlock.
Highlights
Unlike active upper-limb prostheses, passive devices do not provide the user with continuous control over grasping movement
One in three people with trans-radial upper limb absence chooses to use a passive hand as their primary prosthesis [2], with older adults [3] and those with congenital limb absence more likely to choose them [4]
A recent evidence review of passive prosthetic hands and tools recommended research focusing on adjustable hands, as they offer the most potential for improvement [2]
Summary
Unlike active upper-limb prostheses, passive devices do not provide the user with continuous control over grasping movement. They may, improve function by assisting the intact hand/arm with bimanual activities [1]. To close the gap in function, some passive hands include multi-positional joints; these are termed adjustable passive prostheses [2]. By interacting with the environment, the user can position joints to make it easier to hold, stabilise, or carry an object. Suggestions included developing and testing models articulating fingers, adjustable grip force, and/or faster and easier control of grasp/release mechanisms
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