The Effectiveness of Exoskeleton Type Robotic Gait Training Using CIMT for Lower Extremity: in the Aspect of Gait Independence and Balance

Acute Hemiplegic Stroke Including Subacute Phases

The prevalence of stroke has reached 795,000 a year worldwide, which cannot be overlooked. In stroke patients, gait disorder is the most common among the complications of stroke, which is known to have the greatest adverse effect. One of the important goals of rehabilitation after a stroke is the restoration of symmetry and balance of locomotion to prevent complications such as fall. Meanwhile, various methods have been devised in addition to the conventional physical therapy using physical efforts of a physical therapist as a rehabilitation treatment designed to improve gait exercise capacity including body weight-supported treadmill training, Hydrotherapy and robot-assisted gait training. Especially in the case of robot-assisted gait training, it is proven to be more effective in terms of gait function recovery compared to the patient group who only undergoes conventional physical therapy. Robot-assisted gait training can be divided into two types according to the driven principle, exoskeleton-type robot assisted gait training and end-effector gait training. Among them, exoskeleton-type robotic gait training has distinctive feature from another type, the guidance force, which assists the movement of the lower extremities throughout the entire gait cycle according to a pre-set joint trajectory data based on healthy people. For patients who are currently unable to walk, task-oriented sensory information can be provided using this concept diversifying the degree of guidance force for affected lower limb as well as unaffected lower limb. Many studies have set the degree of guidance force to 100% at the side of affected limb at first and then gradually reduce the degree of guidance force to the extent that the patient is tolerable. In contrast, in the case of unaffected limb, there is no mention of the degree of guidance force setting. But, the most representative characteristic of walking is bipedal. Considering the fact that recovering the gait symmetry is the biggest challenge for stroke patients, there is a limitation when not taking into account the activity of the unaffected side. In this respect, this study investigates the effectiveness of constraint-induced movement therapy (CIMT) for lower extremity by modulating degree of guidance force during exoskeleton-type robotic-assisted gait training In this study, a group of patients with acute hemiplegic stroke including subacute phases, less than 3 months after onset were included. And all experiments were conducted over 4 weeks. The group was divided into three: the first group got conventional robot-assisted gait training, guidance force given equally to both limbs. Second group received only conventional gait therapy conducted by physical therapists without robotic gait therapy for the same period of time. The third group got robot-assisted gait training based on CIMT concept; 100% guidance force is given on the unaffected side and then verbal ques are given not to contract unaffected muscle voluntarily as much as possible are provided by physical therapists, automatically according to the predetermined joint trajectory. In contrast at the affected side, gradually reduce the degree of guidance force to the extent that the patient is tolerable. The purpose of this study is to analyze the clinical gait index afterwards to find out whether the group that performed robot gait training using healthy leg restriction therapy is more effective in improving gait pattern and gait independence than the rest of the group. The purpose of this study was to compare the clinical gait index before, after completion of therapy, and 4 weeks after completion of therapy among three group and prove the effectiveness of robot-assisted gait training based on CIMT concept in the aspect of gait patterns and gait independence index.

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