Interactive Exoskeleton Robot for Walking - Knee Joint

Not Applicable

Completed

Brief Summary: An exoskeleton robotic knee system for stroke rehabilitation is proposed in this study. This robotic system has been developed to facilitate functional motor recovery by practices walking with a one joint motor powered exoskeleton to reduce the muscle weakness in the shank and reduce the hyperextension in the knee joint. The robotic knee system is able to sense the gait pattern from the stroke patients and assist the walking and control the knee angle. The clinical trial will use repeated measurements to evaluate the effectiveness of the robotic knee system in gait rehabilitation post stroke.

Recruitment & Eligibility

Inclusion Criteria

Ischemic or hemorrphagic stroke with drop foot problem.
Sufficient cognition to follow simple instructions and to understand the content and purpose of the study. (Mini-Mental State Examination > 20)
Capable of standing and walking independently for an extended period of time. (Functional Ambulation Category > 3, Berg Balance Scale > 40)

Exclusion Criteria

Any medical or psychological dysfunctions that would affect their ability to comply with test study protocol, such as lower back pain, neuralgia, rotational vertigo, muscloskeletal disorders, injuries, and pregnancy.
Any severe contractures in hip, knee, or ankle joint that would preclude passive range of motion in the lower extremity.
Participation in any therapeutic treatment ("outside therapy") performed with the lower extremity during the planned study, including the baseline and the followup.

Arm && Interventions

Group	Intervention	Description
Knee robot	Knee robot	This robotic system has been developed to facilitate functional motor recovery by practices walking with a one joint motor powered exoskeleton

Primary Outcome Measures

Name	Time	Method
Functional Ambulation Category	3-month followup	Patients can be rated on the following categories: 0: Patient cannot walk, or needs help from 2 or more persons 1. Patients needs firm continuous support from 1 person who helps carrying weight and with balance 2. Patient needs continuous or intermittent support of one person to help with balance and coordination. 3. Patient requires verbal supervision or stand-by help from one person without physical contact 4. Patient can walk independently on level ground, but requires help on stairs, slopes or uneven surfaces 5. Patient can walk independently anywhere
6-minute Walk Test	3-month followup	Walk as far a distance as possible over 6 minutes with their preferred speed; assistive devices can be used but kept consistent from test to test Individual should be able to ambulate without physical assistance.

Secondary Outcome Measures

Name	Time	Method
Kinematic and Kinetic Gait Motion Capture	3-month followup	Motion analysis to evaluation the ankle, knee and hip angles; and ground reaction force
Fugl-Meyer Assessment Lower Extremity	3-month followup	Evaluates and measures motor function recovery in post-stroke hemiplegic patients Used in both clinical and research settings, maximum score = 34
Timed 10-meter Walk Test	3-month followup	The individual is instructed to walk a set distance (10 meters). Time is measured while the individual walks the set distance (often the individual is given space to accelerate to his/her preferred walking speed (this distance is not included when determining speed). The distance covered is divided by the time it took the individual to walk that distance.
Modified Ashworth Scale	3-month followup	Tests resistance to passive movement about a joint with varying degrees of velocity; scores range from 0-4, with 6 choices
Berg Balance Scale	3-month followup	Static and dynamic activities of varying difficulty are performed Item-level scores range from 0-4, determined by ability to perform the assessed activity Item scores are summed Maximum score = 56

Locations (2): Department of Biomedical Engineering, The Chinese University of Hong Kong
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Hong Kong, Hong Kong
Interdisciplinary Division of Biomedical Engineering. The Hong Kong Polytechnic Univesity
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Hong Kong, Hong Kong