Objective: To find out which sections of the patella is the most appropriate .Biomechanics of different sections of the patella on the coronal plane are compared. Methods: Twenty fresh human patella were obtained . Each patella was milled sequentially. The specimen model of the patella with the same morphology were compressed and bent. Results:The outcome revealed that the patellar subchondral bone of the lateral facet has the best biomechanical character than the other sections. Conclusion: The optimum level of patella of the retropatellar articular surface is lateral facet. It offers strong subchondral bone support.