Background and need; Knee osteo arthritis (OA) is a metabolically active, dynamic disease that includes both destruction and repair mechanism that may be triggered by biomechanical and mechanical insults. Mechanical factor such as dynamic joint loading have been implicated in knee OA patho mechanics. Several Biomechanical studies shown OA knee patients walks with more secondary compensatory gait pattern of decreased knee excursion , increased adductor moment and joint stiffness to overcome greater ground joint reaction force. This prolonged usage of secondary compensatory gait ends with greater reduction in muscular endurance, strength, imbalance later ending up deformity. So it is important to overcome these physiological changes to avoid further degeneration in knee.   Several   author  conducted study on Backward walking   in normal subjects, their study shown backward waking has more advantageous effects compare to forward in reducing shear force, increasing extensor moment, and to gain flexibility around knee. Considering its advantageous effect, study was proposed to find the efficacy of retro walking in chronic osteoarthritis of knee patients.
 Methods;30 subjects clinically diagnosed as OA and having grade 3 OA changes on radiological evaluation using Kellgren and Lawrence system and fulfilling inclusion criteria were selected in the study. All subjects underwent retro walking on 15 degree angle inclined motorized treadmill with (self tolerated ) minimal pace and gradually increased depending on the patients comfort up to 10 minutes for 10 days. Parameter on VAS, WOMAC, EXTENSION Lag AND DYNAMIC BALANCE THROUGH STEP TEST taken prior and immediately after 10th day of intervention.
 Result; result were statistically analyzed using T test, there was highly significant improvement in all parameters with p<0.0001.
Conclusion; retro walking is highly effective in reducing symptom and overcome disability in patient suffering from chronic OA
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