Patent ID: 8518122

Claim:
A modular joint prosthesis comprising: a head part having a first end comprising a shaft, a curved middle portion, and a second, opposite end comprising a pin to which a slip-on joint ball can be attached, a nail which can be inserted into a bone marrow canal of a long bone, the nail having a nail neck, and a connecting means provided between the head part and the nail neck, the connecting means holding the head part in a non-rotatable manner, wherein the connecting means comprises at least one collar-like module which is arranged in an axial direction of the nail and has at least two half-shells which, are divided in an axial direction of the module, are detachably connected to each other, form an axially extending passage with each other, a first end of the passage for receiving the nail neck into the passage, and a second, opposite end of the passage for receiving the shaft of the head part into the passage, and have recesses which are aligned coaxially with each other in a longitudinal direction of the module, are each positioned perpendicularly to a longitudinal axis and receive a tensioning means which, in the tensioned state, fixes the nail neck and the shaft of the head part in the passage by frictional engagement in a jaw-like manner with a tightening torque sufficient to prevent axial displacement and rotation, and wherein only the shaft of the head part is received within the second end of the passage such that the head part can be rotated with respect to the module when the tensioning means is in an un-tensioned state.