Amputation, Upper Limb
Conditions
Keywords
amputation, upper limb, myoelectric, training, prosthesis, augmented reality
Brief summary
The investigators propose to evaluate the efficacy of MyoTrain AR in a prospective clinical study involving 10 individuals with trans-radial upper-limb loss over a period of 35 days. These individuals will be randomized to Group A (Control Group using conventional motor imagery exercises) and Group B (who will train with the MyoTrain AR system pre-prosthetically). The investigators will test the following hypothesis: Pre-prosthetic training with the MyoTrain AR system, as compared to the current standard of care with conventional motor imagery exercises, results in improved subsequent control stability with the prosthesis. Following a baseline functional assessment, participants will undergo a 30-day pre-prosthetic training period specific to their assigned Group. After this training period, participants will repeat the functional assessment. Participants will then receive their prosthetic device and occupational therapy consistent with the current clinical care standard, after which they will again undergo a battery of validated, clinical assessments.
Interventions
DEVICEMyoTrain AR
MyoTrain AR is a virtual prosthesis functional training system. From a hardware perspective it consists of an augmented reality head-mounted display (HMD), four SteamVR kinematic trackers, eight surface EMG electrodes based on the Element electrode platform, and a desktop computer to facilitate wireless communication between the various hardware components. From a software perspective, MyoTrain AR was developed in the cross-platform Unity 4.0 game development engine.
BEHAVIORALMotor Imagery
Motor imagery describes the process by which a prosthesis user mentally simulates the execution of a desired limb movement and activates the musculature of the residual limb that would generate the desired movement.
Sponsors
United States Department of Defense
University of Alberta
Infinite Biomedical Technologies
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
SUPPORTIVE_CARE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Trans-radial unilateral limb loss with a healed residual limb * Candidate for a 2+ degree-of-freedom (DoF) myoelectric pattern recognition prosthesis as determined by the study prosthetist * Fluent in English * Age of 18 years or greater
Exclusion criteria
* Prior experience with pattern recognition control * Patients with a residual limb that is unhealed from the amputation surgery * Patients with easily damaged or sensitive skin who would not tolerate EMG electrodes * Unhealed wounds * Significant cognitive deficits as determined upon clinical evaluation * Significant neurological deficits as determined upon clinical evaluation * Significant physical deficits of the residual limb impacting full participation in the study as determined upon clinical evaluation * Uncontrolled pain or phantom pain impactive full participation in the study as determined upon clinical evaluation * Serious uncontrolled medical problems as judged by the project therapist
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| GaMA Cup Transfer Task Mean Completion Time | Day 35 | The time to successfully complete the entire task trial (all 4 cup movements) from start to finish; averaged over all successful trials. |
| GaMA Cup Transfer Task Mean Relative Grasp Duration | Day 35 | The percentage time spent in grasp phase relative to the entire movement (each movement involves reach-grasp-transport-release phases). This measure compensates for the expected inter-relation of absolute grasp duration with overall time, specifically identifying if grasp (object handling) is the main culprit in overall prolonged movement times. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Assessment of Capacity for Myoelectric Controls (ACMC) | Day 35 | In contrast to other instruments, the ACMC does not require a specific set of tools or tasks. Instead, the proctor for the measure chooses an everyday activity, such as setting up a table for snacks or replanting a flower, that is relevant to the study population. As the participants perform the chosen task, a trained rater will assess their capacity for control of their myoelectric prosthesis as represented by 30 items reflecting 6 aspects of quality of myoelectric control. These 6 aspects are the need for external support, grip force and opening width, coordination of both hands, in different positions and in motion (timing), repetitive grip and release, and the need for visual feedback. Each item is scored on a 4-point scale and converted into linear measures of myoelectric control using Rasch analysis methods on the ACMC website. This outcome measure permits evaluation of bimanual tasks as well as different planes and work spaces of prosthesis use. |
| GaMA Cup Transfer Task Completion Rate | Day 35 | Percentage of successful trials out of 10 attempts. Note that errors (unsuccessful trials) may include not grasping the cup, or dropping or crushing the cup while in transport. This metric is therefore a general (non-specific) indication of grasp stability throughout the functional task. Errors other than grasp stability can result in an unsuccessful trial (hitting the barrier during transport, knocking a cup over during release, performing task in the wrong sequence) therefore type of error will also be tracked. |
| GaMA Cup Transfer Task Wrist Activation | Day 35 | The ability to coordinate two DoF (hand + wrist movements) is measured by the degree of active wrist rotation from neutral (starting) position at the time of grasp initiation. This measure will identify if there is coordinated use of wrist rotation at the appropriate movement time (at the end of the reach phase) in order to facilitate grasp. |
Countries
Canada
Contacts
Primary ContactRahul R Kaliki, Ph.D
Outcome results
None listed