Insert and shell of a joint ball receptacle

摘要: An insert (11) of a joint ball receptacle prosthetic shoulder according to the invention has first side (I) with depression (15) for receiving ball, and second (II) which is provided formed being received in shell (13) receptacle. According invention, snap-action mechanism (19) extends around central axis (17) arranged on (II), has, as seen from together collar (21), an undercut (23) (17), such way that (21) can engage elastic deformation behind correspondingly mating element (25) (13), wherein discontinuous peripheral direction at least one point (31); cylindrical guide region (27) outer periphery (13).