Effects of a Machine Learning-based Lower Limb Exercise Training System for Knee Pain

Inclusion Criteria: Participants will be recruited if they * age ≥ 50 years, * report having pain in or around the knee for more than 12 weeks and on most days of the previous month, * report being diagnosed with knee OA by a physician, have physician-diagnosed knee OA in the medical record, or have radiographic evidence of grade 2 to 3 knee OA on the Kellgren-Lawrence scale in the posteroanterior and/or skyline view or the presence of lateral/posterior osteophytes (the X-rays will be read and classified by our orthopaedic surgeons collaborators to decide on each patient's eligibility to be included in the study), * are willing and physically and cognitively able to perform (technology-supported) exercises required in the study protocol * have normal or corrected to normal vision, * are able to speak and read Chinese, * are able to provide written informed consent. Exclusion Criteria: Individuals will be excluded if they have * history of knee or hip replacement surgery, * non-ambulatory status, * systemic inflammatory arthritis (e.g., gout), * history of trauma (e.g., fractures around the knee, dislocation, and sprains or tears of soft tissues, like ligaments) or surgical arthroscopy of either knee within the past 6 months, * intra-articular injection to the knee within the past 6 months, * cognitive impairment, * involvement in a similar study in the past 6 months, * recent or imminent surgery (within 12 weeks), * medical co-morbidities that preclude participation in e…