Background: The mobile-bearing knee prosthesis was claimed to get more flexion in the laboratory testing and may provide better functional outcome than the conventional fixed-bearing prosthesis in patients. To prove this hypothesis in the patients between those two type prosthesis about flexion and functional out come was our study goal.
Material and Method: The prospective randomized control trial. The Free-Hand-Cutting technique underwent TKR (100 mobile bearing and 100 fixed bearing). Post operative clinical outcomes were compared in range of movement, Knee Society Score, Function Knee Score and Oxford Knee Score at 2 months, 6 months, 1 year and 2 years.
Results: The mobile-bearing type prosthesis provided more flexion than the fixed-bearing knee prosthesis. But the same clinical out come was observed.
Conclusion: The mobile-bearing type prosthesis gave more functional out come but not significant in daily patient activity compare to the fixed bearing knee prosthesis.

Keywords: Mobile-bearing, Fixed-bearing, Range of motion (ROM), Knee society score, Functional score, Oxford knee score