RecruitingPhase 2Device studySustained Acoustic Medicine for Symptomatic Treatment of Knee Pain Related to OsteoarthritisThe purpose of this study is to assess the ability of long-duration low intensity therapeutic ultrasound (LITUS) to alleviate knee Osteoarthritis pain over a 24-week period. The primary objective of this study is to evaluate the analgesic effect of LITUS in subjects suffering from knee Osteoarthritis pain. Secondary objectives are to assess the ability of LITUS to improve joint function.