الفهرس 
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Abstract
A two dimensional dynamic model of the human knee joint is presented . in this model the surfaoes of the tibisl and femoral oondyles are represented by polynomials. the major four ligaments of the knee joint ara modelled as nonlnear elastic spring of realistic stiffness properties. these ligaments are medial collateral lateral collaterel snterior oruoiate and posterior oruoiste ligaments nonlinear equations of motion coupled with nonlinaar constraints are solved numerioally.the friotian force is included in the mathematical model. time der ivatives are approximated by newmark difference formulse and the resulting nonlinear algebraio equations are solved by applying the geuss alimination method the parameters given to the programme may be the body weight