A medical ligating apparatus includes a medical ligating device having a member which is made of a flexible line and ligates living tissues, and a fixing member which is movably provided at the ligating member and fixes the living tissues in a ligated state, a manipulating device having a flexible sheath and a proximal manipulating section, and a cutting member for cutting the ligating member. Means are provided for deriving two array output signals from the output signals of the microphones, the array having two main sensitivity directions running at an angle with respect to one another and each of which is associated to an array output signal. In addition, the interface can output assistance information in situ with the user interface. The speech application interacts using a speech modality only. Once the frame component is secured to the resected femur, a shell component of the provisional prosthetic system may be positioned on and secured to the frame component. The method involves exposing the surface to an environment that preferentially promotes evaporation of material from the region of nanoscale roughness.