ACTive Exoskeleton for Unilaterally-Assisted Locomotion (ACTUAL)

Study Overview
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Brief Summary
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Walking difficulties are common symptoms after stroke, significantly reducing quality of life. Walking recovery is therefore one of the main priorities of rehabilitation. Wearable powered exoskeletons have been developed to provide lower limb assistance and enable training for persons with gait impairments by using typical physiological movement patterns. Exoskeleton were originally designed for individuals without any walking capacities, such as subjects with a complete spinal cord injury. Recent systematic reviews suggested that lower limb exoskeletons could be valid tools to restore independent walking in subjects with residual motor function, such as persons post-stroke.The aim of the study was to identify the end-users needs and to develop a user-centered-based control system for the TWIN lower limb exoskeleton to provide an efficient post-stroke rehabilitation of gait. The investigators thus carried out the development and validation through evaluation sessions performed on healthy clinical experts and persons with stroke to evaluate TWIN-Acta usability, acceptability, and barriers of usage. A phase two includes a pilot study of efficacy of using the TWINActa for gait rehabilitation for persons with stroke.

Detailed Description
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The aim of the study was to identify the end-users needs and to develop a user-centered-based control system for the TWIN lower limb exoskeleton to provide post-stroke rehabilitation. The investigators thus carry out the development and validation of TWIN-Acta: a novel control suite for TWIN, specifically designed for gait rehabilitation of persons post stroke through use of typical physiological movement patterns. The study will be carried out in two phases. In the first user-centered developmental phase data on usability, acceptability, and limitations to system usage will be collected from clinical experts and persons with stroke through questionnaires and semi-structured interviews.This developmental phase will follow a user-centered approach: it will be based on focus group sessions with clinical and biomechanical experts to define the design specifications for the new control modality of the exoskeleton; consequently evaluation sessions consisting of physical testing of the TWIN-Acta will be carried out by healthy clinical experts and persons with stroke to evaluate TWIN-Acta usability, acceptability, and barriers of usage. In the second phase of the study a pilot study including 20 sessions of gait rehabilitation of persons at least three month post stroke will be carried out in clinic with the TWIN exoskeleton including the TWIN-Acta control suite. Outcomes will be verified at baseline and following the intervention through feasibility measures, patient reported outcomes, clinical measures of gait ability and through EMG and 3D gait analysis. The quantitative values will be compared to data of healthy controls walking in the exoskeleton in one session but not receiving any intervention.

Official Title
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Use of a Lower Limb Exoskeleton in Locomotor Rehabilitation of Stroke Patients: Feasibility, Safety and a Pilot Clinical Study

Conditions
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Stroke Sequelae, Gait, Hemiplegic

Intervention / Treatment
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* Device: Exoskeleton stroke group


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy subjects Age 30-75 anni; 50 kg ≤ weight ≤90 kg 150 cm ≤ height ≤ 192 cm Thigh length: 355 ÷ 475 mm; Length of tibia: 405 ÷ 485 mm; Width pelvis: 690 ÷ 990 mm; Shoe number: 36 ÷ 45 Subjects with stroke Age 30-75 anni; 50 kg ≤ Weight ≤90 kg 150 cm ≤ Height ≤ 192 cm Thigh length: 355 ÷ 475 mm; Length of tibia: 405 ÷ 485 mm; Pelvic width: 690 ÷ 990 mm; Shoe number: 36 ÷ 45; Stroke diagnosis at least 3 months and within 24 months; First unilateral haemorrhagic or ischemic stroke classified as complete or partial infarction of the anterior circulation and infarction of the lacunar circulation (Oxford Stroke Classification: TACS -Total Anterior Circulation Stroke, PACS - Partial Anterior Circulation Stroke, LACS -Lacunar Stroke). These criteria may include hemiplegia, hemianopia, motor and/or sensory deficits, and disturbance/impairment of superior cortical and subcortical function; FAC (Functional Ambulation Category) 1, 2 and 3 (subjects with ambulation dependent on supervisor or continuous or intermittent physical assistance); At least MRC (Medical Research Council) of the triceps surae equal to 1 or greater (required to produce the biofeedback tone or for exoskeleton control). Exclusion Criteria: Healthy subjects Prosthetic implants Musculoskeletal, neurological, cardiovascular and pulmonary disorders that may impair gait; State of pregnancy or breastfeeding. Exclusion criteria Subjects with stroke Mini Mental State Examination < 23/30; Clinical records of visuospatial and ideomotor apraxia, behavioral disorders (e.g. depression, aggression), neglect, major visual impairment and severe osteoporosis; Non stabilized fractures; Cranial injury; Other diseases attributable to cardio-respiratory problemsi; State of pregnancy or breastfeeding; Previous or concurrent neoplasic malignancy; Chronic inflammatory diseases with joint involvement of the lower limbs; Serious spasticity (Ashworth>3); Pelvic fractures and unstable column; Significant limitations of passive ROM of hips and knees; Problems with skin integrity at the interface surfaces with the device or that would prevent sitting.

Ages Eligible for Study
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Minimum Age: 30 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Interventional Model Description: A pilot intervention feasibility study
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Exoskeleton Stroke group<br>This group will receive gait rehabilitation with the exoskeleton for 20 sessions in clinic. | Device: Exoskeleton stroke group<br>* The exoskeleton stroke group will receive gait rehabilitation with the TWIN-Acta exoskeleton<br>* Other names: TWIN-Acta exoskeleton;|
| No Intervention: Healthy control group<br>The quantitative data, including EMG and 3D kinematics, from 10 healthy controls walking with the exoskeleton will serve as comparative data for the experimental group. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in meters walked during the Two minute walking test | The subjects were instructed to walk at their usual speed for 2 minutes while the distance they covered in 2 minutes was recorded in meters. | Baseline (T0) and after 4 weeks (T1) and after 3 months (T2) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in score on the Ashworth scale | The Ashworth scale is a muscle tone assessment scale used to assess the resistance experienced during passive range of motion | Baseline (T0) and after 4 weeks (T1) | 
| Change in score on the Muscle Manual Test (MMT) | MMT is a standardized set of assessments that measure muscle strength and function | Baseline (T0) and after 4 weeks (T1) | 
| Change in time (sec) taken to Timed up and Go | The Timed Up and Go test (TUG) is a simple test used to assess a person's mobility and requires both static and dynamic balance. | Baseline (T0) and after 4 weeks (T1) | 
| Change time (sec) taken to complete the Five time sit to stand (5xSTS) | The 5xSTS measures the amount of time it takes for a patient to sit and stand five times in succession with arms folded across their chest. | Baseline (T0) and after 4 weeks (T1) and after 3 months (T2) | 
| Change in score on the Stroke impact Scale (SIS) questionnaire | The Stroke Impact Scale (SIS) is a self-report questionnaire that evaluates disability and health-related quality of life after stroke | Baseline (T0) and after 4 weeks (T1) and after 3 months (T2) | 
| Change in time (sec) taken to complete the 10 meter walking test (10mwt) | The 10 meters walking test (10MWT) is a test in which the participant is timed while walking 10m at their comfortable speed. | Baseline (T0) and after 4 weeks (T1) and after 3 months (T2) | 
| Changes in movement parameters extracted from the kinematics of the body. | Kinematics of the lower limb will be recorded using a 9 camera optoelectronic system during 3D motor acts. The system will measure the 3D coordinates of spherical markers attached to body landmarks to compute hip, knee and ankle angles. Data processing will provide measures of deviations from physiological movement. | Baseline (T0) and after 4 weeks (T1) | 
| Correlation between brain activity parameters and motor activity parameters | Brain activity data acquired with electroencephalogram (EEG) correlated with data from electromyographic systems. Data processing will provide measures of deviations from physiological movement. | Baseline (T0) and after 4 weeks (T1) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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User centered design, Stroke, Gait rehabilitation, Hemiparesis, Exoskeleton