_^Download 

The ‚Low Profile’ design of the cementless Cepthar® acetabular system is defined to enhance the stability and to support long-lasting bony integration.

Fit area:
-reduction of tension towards the pole area
-Fit: 100μm coating
PressFit area:
-safety against tilting and migration
-PressFit: 300μm coating
Pole area:
-gap between cup and acetabulum
-protection of the bone

Pole area

The PressFit of hemispherical acetabular implants results from underreaming of the implant bed. The resulting PressFit acts upon the total bony area of contact. In the area of the acetabular base and in the pole area respectively this action is undesirable, because the resulting forces hold the risk of migration and loosening of the implant. For this reason the Cepthar® Cup is flattened in order to guarantee the protection of the bone and to reduce the risk of loosening.

PressFit area

The Cepthar® cup locks stable through a peripheral enhanced PressFit. The primary stability is produced by the rough pure titanium coating of 300μm applied in the circumference. The PressFit grows progressively with the external diameter of the Cepthar® acetabular implants. An excellent primary stability could be shown in comparative tests with standard implants (report of Technical University at Hamburg-Harburg). The primary stability decisively depends on the rate of tensions which appear during insertion of the implant. The degreee of these bone tensions is defined by the rate of the underreaming. On equal underreaming with all implant diameters you can see an increase of the resulting bone tensions rising with the growing diameter of the cups. To prevent bursts of the acetabulum with large diameters and decrease of the primary stability with small implants, the PressFit of Cepthar® increases proportionally to the cup diameter (from 1,6mm with external diameter: 46mm up to 2,05 with external diameter: 68 mm).

Fit area

The cup has also got a rough pure titanium coating in the adjacent Fit area in order to enhance the osteointegration. The geometry corresponding to the reaming of the cup leads to reduced tensions in direction to the pole.