Abstract: The present invention relates to a navigation device (4) for visually selecting and positioning components of a multi-part joint endoprosthesis (1) for ball joints of a human or animal body, in particular a hip joint endoprosthesis, with a shaft (2) that can be inserted into a marrow cavity of a bone, an exchangeable connection neck (3) and a joint head located at the free end of the connection neck (3), forming a ball joint with a joint socket (5) that can be connected to a bone, wherein there is provided at least one navigation ball (4) with an outer diameter corresponding to the joint socket (5) and with a recess (8) for attachment at the free end of the connection neck (3) as well as with at least one partially peripheral marking (6) provided on its surface, as well as two or more connection necks (3) of different geometries, wherein each connection neck (3) may be connected with the shaft (2) at different positions and at the same or at different CCD angles and at the same or different antetorsion angles

Abstract: A joint endoprosthesis has a first implant component which can be attached to a first epiphysis, and a second implant component which can be attached to a second epiphysis of two epiphyses forming a joint, with the first implant component and the second implant component each having articular surfaces for the formation of a swivel joint, and with a sliding piece being provided that in addition enables a rotational movement and a translational movement of the epiphyses with respect to each other.