The acetabular cup (2) comprises a metal outer shell (4), a plastic intermediate shell (5) and a metal inner shell (6) which can be positively inserted into the intermediate shell. The outer shell (4) is divided up into segments (4a, 4b, 4c, 4d, 4e) by slots (9) which are open towards its equatorial edge region. The outer shell (4) and the inner shell (6) are rigidly supported relative to one another via an attachment part (8) in the direction of a common principal axis (A) and connected so as to be fixed against rotation via a fastening element (15) eccentrically offset relative to this principal axis (A). The intermediate shell (5) is designed with a passage opening (20) receiving the attachment part (8) and with an outer surface (21) which has a support part (21a) intended to rest against a part of the inner surface (18) of the outer shell (4) and delimits a play (S) outside this support part (21a) with the remaining part of the inner surface (18). This play permits corresponding relative movements of the intermediate shell (5) containing the inner shell (6) and at least one of the segments (4a, 4b, 4c, 4d, 4e) of the outer shell (4) perpendicular to the principal axis (A). Upon loading, the implanted outer shell (4) can deform elastically with the bone part surrounding it, whereas the spherical shape of the inner shell (6) is retained. IMAGE
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