The cementless XentraX cup is equipped with a patented self-cutting trapezoid thread (Pat. EP 1061867) on the spherical outer shell. This thread type allows a substantially easier screwing of the cup with respect to comparable threaded cup systems .
The handling of the cup is very easy. You have only two setting instruments for all 12 sizes of the cup.
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 closure of pure titanium (EP 1441673).
It‘s possible to use ballheads with 36mm diameter from cup size 50 with ceramic liners. From cup size 54 it‘s possible to use 40 ballheads in ceramic. The bigger ballheads increase the ROM of the cup, which ends up to more mobility for the patient.
 Effenberger H et al. Eindrehverhalten von Schraubpfannen
Zeitschrift für Orthopädie + Unfallchirurgie 2008;