A prosthesis or orthosis having a movement controlling mechanism (MCM) including a first MCM part, a second MCM part and one or more intermediate elements and biasing mechanism which, in a contacting mode of operation of the MCM, bias the intermediate elements against a MCM part. When a relative torque or force is applied in a blocking sense (U) transmission of torque is allowed and, on the other hand, when a torque or force is applied in the opposite sense (V) non-blocking relative movement is allowed.