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In Thailand, people with knee osteoarthritis often found in the elderly. The main symptoms is pain, limit in knee ROM, muscle weakness or atrophy and limit in Activities Daily Living (ADL). In severe case, physician will decide to make an operation. Total Knee Arthroplasty (TKA) is a common intervention that can enhance the quality of life for patients with knee OA. A focus of rehabilitation is regaining range of motion in the knee and mobilizing the patient. Because restricted knee ROM affects functional activities,knee ROM is still considered to be one of the primary indicators of a successful TKA. Continuous passive motion (CPM) machine are frequency used to increase knee ROM after a TKA and to promote a rapid postoperative recovery.