A Powered Exoskeleton for Veterans With Knee OA

Inclusion Criteria: * medical diagnosis of Grade 3 or 4 knee OA * have a prescribed knee brace for at least three months * self-reported knee pain when standing, walking, climbing stairs, squatting, or other mobility activities * self-reported limitations to mobility and walking activities due to knee pain, stiffness, loss of range of motion Exclusion Criteria: * neurological paralysis causing an inability to stand, weight bear or take stepping movements * fixed contractures resulting in limited range of motion in the hip, knees, or ankles that prevent sitting, standing, walking, and/or squatting activities * able to walk at a normal walking speed (\>1.2 m/s) based on a 6-minute walk test (6MWT) * anthropometric incompatibility with the device * any medical complication or co-morbidity as judged by the study physician to be contraindicated for wearing the device or walking (e.g., cardiovascular disorders, pressure ulcers, open wounds, lower limb vascular disorders, or other medical conditions) * a score of \<8/10 on the MacArthur Competence Assessment Tool for Treatment (MacCAT-T) (as a proxy for cognitive competency screening); and 7) pregnancy or planning on becoming pregnant