The cementless SSC cup is a parabolically shaped threaded cup made of pure titanium according to ISO 5832-2. An external feature is a patented self-cutting trapezoid thread (Pat. EP 1061867). This thread type allows a substantially easier screwing of the cup with respect to comparable threaded cup systems.
Thanks to this feature, the operator can follow exactly how the “set point” – i.e. the contact of the cup body with the pre-reamed acetabular bed – is being reached. An over-screwing of the cup is almost impossible.
Thanks to its parabolic shell, the cup achieves a very high axial and primary stability. The external cone angle, which increases with increasing outer diameter, is adjusted to the bone structure and allows a bone-sparing implantation.
The opening at the bottom of the cup allows an optical control of the correct depth of insertion and enables, when necessary, a subsequent relining with cancellous bone material. The bottom of the cup is tightly closed with a simple-to-handle patented bottom lock of pure titanium (Pat. EP 1441673).
A fast osseointegration and a good secondary stability is achieved through the corundum-blasted surface.
The SSC threaded cup is available in 9 sizes with diameters from 45 to 72 mm. Both polyethylene and ceramic inserts are available. Ceramic inserts for 32 mm femoral heads can be inserted for the smallest size 45. The polyethylene inserts are available in standard version and, for special cases, in a dysplasia version. For the dysplasia version, the position of rim elevation is freely selectable.
Dr. med. J. Schunck, Cologne
 Effenberger H et al. Eindrehverhalten von Schraubpfannen
Zeitschrift für Orthopädie + Unfallchirurgie 2008;