Virtual Environment Rehabilitation for Chronic Stroke

Inclusion Criteria: * Greater than 6 months following stroke * Ability to walk 10 feet with or without assistance * 18 years of age or older * Clinical presentation of unilateral hemiplegia post-stroke * Ability to follow simple two-step instructions Exclusion Criteria: * Unable to ambulate 150 feet prior to stroke * History of serious chronic obstructive pulmonary disease or oxygen dependence * Severe weight bearing pain * Lower-extremity amputation * Non-healing ulcers on the lower extremity * Renal dialysis or end stage liver disease * Legal blindness or deafness or severe visual or hearing impairment * A history of significant psychiatric illness defined by diagnosis of bipolar affective disorder, psychosis, or schizophrenia * Life expectancy less than one year * Severe arthritis or orthopaedic problems that limit passive ranges of motion of lower extremity: Knee flexion contracture of -10 degrees, Knee flexion ROM \< 90 degrees, hip flexion contracture \> 25 degrees, ankle plantar flexion contracture \> 15 degrees * History of deep venous thrombosis or pulmonary embolism within 6 months * Uncontrollable diabetes: diabetic coma, frequent insulin reactions * Severe hypertension with systolic \> 200mmHg and diastolic \> 110mmHg at rest * Intracranial hemorrhage related to aneurysm rupture or an arteriovenous malformation (hemorrhagic infarctions will not be excluded) * History of severe seizure disorder; other neurological conditions such as multiple sclerosis or Parkins…