The knee is one of the most frequently injured joint in the human body. A recent study suggests that compressive loads on knee may play a vital role in injury to knee joint parts. This project is focussed on the axial compressive force tibia, using that the radial force on the knee cap can also calculate. The compressive force is determined on Tibia in different postures like standing, stepping up, stepping down and in 900 bent of the knee using mechanics. Stresses at different points were identified using FEM on Tibia.