Aim: of the study was to compare the functional outcome in patients undergoing navigation and conventional total knee replacement. secondly to compare the component alignment in patients undergoing navigation and conventional Total Knee Replacement. Materials and methods: Total 80 patients were included in study out of which 40 patients were in each group. All the surgeries were done by single surgeon and subvastus approach was used for all the total knee replacements. Pre-operative functional assessment was done by KSS score14. Preoperative radiological grading of osteoarthritis was done using AHL back. Post operatively all patients were followed upto 1,3 and 6 months and at the end of 6 months radiological assessment of the components was done by measuring Alpha, beta, gamma and sigma angles. Conclusion: Navigation TKR significantly improves the alignment of both femoral and tibial components when compared with the conventional TKR. However there was no significant difference in functional outcome between the two methods. Probably a long term study might highlight on if navigation has a role in improving the longevity of the implant.