The invention relates to an ankle and knee orthosis (100) motorized and of modular type, comprising a knee articular unit (1) and an ankle articular unit (2). Each of these articular units (1, 2) is formed by two elements (11, 13 21, 23) angularly movable relative to one another between which is interposed a torsion spring (12, 22) or an equivalent elastic element. The overall arrangement is such that, in use, this elastic element is induced in a condition of elastic loading by a corresponding motor or pair of motors (111, 112 211, 212) of the orthosis associated with one of the two elements angularly movable in such a way as to exert a corresponding elastic action on the other articular member, which elastic action assists a motive act of the subject.
