Trajectory record arm

A trajectory record arm, wherein a connection apparatus is engaged on the trajectory arm in order to provide a transmission of a motion trajectory of the connection apparatus to a trajectory recording device, and the trajectory record arm comprises:

• at least one telescopic bar, wherein the at least one telescopic bar is engaged on a first side with at least one fastening element through at least one first slot and on a second side with the connection apparatus using at least one second slot that allows for freedom of rotation between the at least one telescopic bar and the connection apparatus, so that a freedom of rotation is allowed between the at least one fastening element and the connection apparatus,
• at least one first sensor for detecting a movement between the at least one telescopic bar and the at least one fastening element,
• at least one second sensor for detecting a distance change between the at least one fastening element and the connection apparatus based on a change in a length of the at least one telescopic bar,
• at least one third sensor for detecting a movement of the connection apparatus in relation with the at least one telescopic bar.