This prospective randomized single-blinded trial was conducted at the Istanbul Physical Medicine and Reha- bilitation Training Hospital in Turkey. A total of 100 patients between the ages of 40–70 years diagnosed with knee OA and a Kellgren-Lawrence grade of 2 or 3 according to American College of Rheumatology criteria were enrolled in the study22, 23). Exclusion criteria from the study included: any contraindications against performing physical therapy, dermatological problems, any systemic disease, abnormal laboratory test results, previous history of knee surgery or arthroplasty, previously participating in a physical therapy program, previous history of hyaluronic acid or steroid intraarticular injections, or having US therapeutic acoustic radiation within the last 6 months.