Effects of Myoelectric Channel Count and Targeting for Upper Limb Prosthetic Control

Study Summary

The goal of this clinical trial is to systematically evaluate whether or not two commonly held fundamental assumptions for pattern recognition control translates to functional performance when tested on individuals aged 18 years or older with upper limb absence at the transradial level while wearing a physical prosthesis. The specific aims of this study are: 1. To evaluate the effect of changing untargeted myoelectric channel count on the functional performance of transradial prosthesis users wearing a fully functional prosthesis via functional outcomes measures such as the Box and Blocks test. 2. To evaluate the effect of changing myoelectric channel targeting of a fixed number of myoelectric channels on the functional performance of transradial prosthesis users wearing a fully functional prosthesis via functional outcomes measures such as the Box and Blocks test. Researchers will perform a randomized crossover study to compare system configurations with different number of sensor channels and with various strategies for sensor placement on the limb. Participants will be assigned to a random test sequence that includes the following four different EMG channel conditions: Condition A: 4 untargeted channels Condition B: 8 untargeted channels Condition C: Up to 16 untargeted channels Condition D: 8 targeted channels Researchers will evaluate the effects of changing myoelectric channel counts on the functional prosthesis performance of individuals with transradial limb loss via functional outcome measures. Participants will: * Attend up to 5 in-lab sessions that are expected to last 4 hours. * Conduct site visits every 1-2 weeks to complete functional and self reported outcome measures with each condition. * Play virtual games with the Coapt Cuff for 15 minutes a day, 3 days a week in between visits.

Primary Outcome

The ACMC is a performance-based assessment where trained raters observe the user performing a task and rate their ability to control specific hand movements. These movements are rated on a 4-point scale, ranging from "not capable" to "spontaneously capable". 0 = Not capable. 1 = Sometimes capable, capacity not established. 2 = Capable on request. 3 = Spontaneously capable. The items comprising the ACMC describe different levels of difficulty of control of the myoelectric hand. The items are gro

Conditions Studied

Interventions

• DEVICE Experimental socket with 4 untargeted channels active
• DEVICE Experimental socket with 8 untargeted channels active
• DEVICE Experimental socket with up to 16 untargeted channels active
• DEVICE Experimental socket with 8 targeted channels active
• DEVICE Coapt EMG Cuff

Study Locations (2)