Introduction: Osteoarthritis of knee is most common chronic degenerative disease requiring total knee replacement in advanced stage.TKR is being performed in high numbers in developing countries as well. Initially, tibial components were cemented all polyethylene monoblock constructs. Subsequent studies showed excellent long term follow up in terms of durability up to 20 years. Purpose: Aim of the study: 1) to compare the functional outcomes of All Poly tibial components to Metal Back tibial components in patients aged over 60 years. 2) Cost-effectiveness analysis(based on outcome and pricing) Methods: A retrospective study was done in Orthopaedic Department of chirayu medical college and Hospital, Bhopal, M.P. & evaluated 120 patients operated from January 2018 onwards. 60 cases of OA knee treated with cemented TKR with Metal backed prosthesis and 60 cases with all polyethylene prosthesis. The patients were followed up at 1st, 3rd, 6th months &1year post-operative. Functional outcome was assessed prospectively by(KSS) Knee Society Score and range of motion at 6th month & 1 year. Results: In this study, 76 knees of 60 patients were replaced by polyethylene tibial component implant & 78 knees of 60 patients were replaced by metal backed tibial component implant. 40 (52.63%) out of 76 operated knee in allpolyethylene group were male & 37(47.43%) out of 78 operated knee in metal backed group were male. Mean age of all polyethylene group was 66.8 ± 4.6 years & of Metal backed group was 68.3 ± 5.8 years. Mean flexion deformity of knee in both groups was statistically not significant (P value >0.05). Mean Knee functional score,mean knee clinical score & mean knee range of movement in both group at pre-operative, at 6 month post op. ,at 1 year post op. time was statistically not significant (P value >0.05). Conclusion: The functional outcome comparison of the polyethylene tibial component with metal-backed component, was excellent (majority) and good (few cases) & had no significant outcome difference. Considering the limitations, we suggest that APT components are equal to metal-backed ones across the age categories, it should be used more frequently implantation of TKRs due to cost-effective option, even in younger patients.