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In this paper we construct some natural geometrical objects on the 1-jetspace J^1(R,R^3), like a nonlinear connection, a Cartan linear connection(together with its d-torsions and d-curvatures), a jet "electromagnetic"d-field and its geometric "electromagnetic" Yang-Mills energy, starting from agiven dynamical system governing the three-dimensional motion of the knee inthe mathematical model introduced by Grood and Suntay. The correspondingYang-Mills energetic surfaces of constant level (produced by this kneedynamical system) are studied.

From a dynamical system of the knee to natural jet geometrical objects