Is direct bone-polyethylene contact possible with the BICON-PLUS® cup system?
No, the following four design features prevent direct contact between polyethylene and bone: • The screw hole in the cup base is fully sealed off by a titanium cap pressed into the cup insert • Unlike other cup designs this polyethylene cup insert does not have any lateral nodules at the cup entrance • The circular indentation in the polyethylene cup insert on the cup entrance increases the gap between cup and bone • The window perforations in the cup base allow the insertion depth and positioning of any bone graft to be assessed when the cup shell is screwed in, and are closed off by the three-vaned rotary sector shutter.
