An assembly of electromechanical devices designed to be used during computer assisted surgery (CAS) as a functional extension of the surgeon for precise bone and soft-tissue modelling or soft-tissue removal (e.g., during a total knee joint arthroplasty (TKA)). It is computer-based and typically consists of an operator’s console and robotic arms for instrument manipulation. The input to a computer is usually by means of an existing computed tomography (CT) or magnetic resonance imaging (MRI) scan. It can also be used as a training aid for surgeons from a variety of specialities.