The prosthesis for a lower limb comprises an element for receiving a thigh stump fitted on a support part, a leg assembled on said support part by a pivot link forming a knee joint to enable flexion or extension of the leg with respect to the element for receiving, and a absorbing system to absorb the flexion or extension efforts. The absorbing system is fitted on the one hand on the pin of the pivot link and on the other hand on a first end of a rocker pivotally mounted on the leg, and a rod is fitted on the one hand on a second end of the rocker and on the other hand on the support part.
