Aim: The purpose of this study was to evaluate the efficacy of psychometrictools andphysiotherapeutic interventions on pain perception in knee osteoarthritis patient. Case Study: A 58-year-old male patient with bilateral grade-2 primary knee was referred to a physiotherapist with a complaint of bilateral knee pain. He experienced pain severity of nine on visual analog scale, difficulty climbing stairs and while walking. Pain was also assessed using self-rated psychometric tool such as Knee pain and osteoarthritis outcome score(KOOS). The pain subscale was 12% means severe painprior to the intervention using KOOS questionnaire. The patient was given bilateral multiple angled resisted exercises twice daily for 3 weeks. At the end of 6th week pain was nearly normal twoon visual analog scale andKnee pain and osteoarthritis outcome scorepain subscalewas 90% means substantial pain relief and good improvementin gait. Discussion: Psychometric tools are the most reliable and validated tools in the evaluation pain perception in bilateral knee osteoarthritis as the pain perception differs during various activities of daily life. Conclusion: This case concludes that resisted exercises were effective and these scales are diagnostic as well prognostic in use for longitudinal prospective interventional studies due to their validity and reliability.