Objective: To determine the effectiveness of different interventions: conventional exercises, and a stationary cycle and motorized treadmill as an adjunct to it in improving the functional status of patients with knee osteoarthritis. Method: Experimental study (RCT type of study). 95 patients with knee osteoarthritis fulfilling the inclusion and exclusion criteria of the study were studied. Patients were randomly allotted by envelope method to any of the three groups. All patients were subjected to a standardized assessment including the detailed demographic details, Visual Analogue Scale (VAS) for assessing pain, 36, 61 The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) for pain, stiffness and physical function, 33, 62 Timed Up and Go test (TUG) for assessing physical function and balance, 63, 64, 65 and Single Leg Standing test (SLST) for assessing balance, 65 were taken post 1 week and post 2 weeks of the intervention. The intervention was given on thrice a week schedule for total two weeks follow up. Difference between the three groups was compared by statistical methods. Result: The study shows that irrespective of the demographic characteristics and the other parameters (OA grade, leg dominance, U/L or B/L, etc.), all the three intervention groups A, B and C are homogenous and comparable and effective intervention types showing statistically significant difference. Conclusion: The study shows a statistically highly significant result of Group C, i.e. motorized treadmill within sub maximal limits should be used as an adjunct to conventional exercises for treating Grade I and Grade II knee osteoarthritis patients in improving their functional status.