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This paper concerns a model of an orthotic’s robot lower limb rotation system, intended for use in typical contemporary orthotic robots such as the ‘Veni-Prometheus’ System for Verticalisation and Aiding Motion designed at the Faculty of Mechatronics, Warsaw University of Technology. In the article the state of the art is briefly stated, with the relatively low number of orthotic robots allowing the realisation of pivoting turns highlighted. The intended two stage pivoting turning movement is detailed and the operating conditions as well as limitations of the turning module are indicated. The conception of turning module introduces additional degree of freedom to existing orthotic robot designs by realising the rotation about the lengthwise axis in the thigh link. The three dimensional model and its analysis are shown. The proposed design ensures the necessary movement of lower limb and the torso of impaired person during the execution of pivoting turn while remaining compact in order to ease the introduction of the turning system to different orthotic robot designs.