This prospective study was conducted to assess the clinical and functional outcome of TKA using knee society score and to find association between knee functional score and knee clinical score With the varied amount of implant designs available the posterior cruciate substituting design was found to be effective. In our study, 61 to 65 years which accounts for 35% of patients in our study. The youngest patient was 54 yrs of age and oldest patient was 74 yr. of age the mean age was 63.45 yrs. This is in accordance to study conducted by Wood et al.15 The knee society score is used to assess the outcome of total knee arthroplasty. The knee society score rating system is a logical outgrowth of the hospital for special surgery rating system. In our study, on clinical and functional evaluation of the patients, assessed by the KSS score significant improvement was observed in both KCS and KFS score during follow up at 3, 6 and 12 months as compared to preoperative value.