Aseptic Loosening
•Initial interlock
•Bone metabolism
•79 % survival at 25 years
(Sochart/Porter1998 Lehtimaki J Arth 199 14 657-61)
•Increased loosening
Ahnfelt Acta Orth Scand 1990 61 238 1-26 (Swedish Arth Register)
•No Difference
Furnes JBJS 83B 2001 579-586                   (Norwegian Arth Register)