The invention relates to an artificial joint cup (2) in particular a hip joint cup for implanting in a cavity in a bone. The joint cup (2) is in particular substantially in the form of a spherical dome cup having a convex outer surface (3) and a concave inner surface (4). In addition the joint cup (2) comprises an outer diameter (OD) and an inner diameter (ID). The ratio of the difference (D) between the outer diameter (OD) and the inner diameter (ID) in relation to the outer diameter (OD) is in a region between 0.5 and 0.07 preferably between 0.3 and 0.075 particularly preferably between 0.2 and 0.1. The invention is characterised in that the joint cup (2) is made of a ceramic material and the convex outer surface (3) has a micro structuring.
