20:45 Feb 3 

Yes, I think so, too.
There are also German references that use 'Verzahnung' and the English 'mechanical interlock(ing) or Verzahnung and Stabilität, Primärstabilität or Verbundstabilität' Here is a bilingual doc with interdigitation/Verzahnung http://www.springerlink.com/content/5664rtjnc9hb544w/

20:19 Feb 3 

I think "interdigitation" refers to the penetration of the cement into the spaces in cancellous bone - interlock is the result.

http://www.bonecement.com/cementing-techniques/preparation/m...

Bone bed preparation - Biomet® Bone Cement
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To achieve adequate cement interdigation and a viable interlock, preservation of cancellous bone stock is of great importance.

A comparison of structural and mechanical properties in cancellous ...
www.mendeley.com/.../a-com... - Vereinigte Staaten - Diese Seite übersetzen
von MS Thompson - 2004 - Zitiert durch: 4 - Ähnliche Artikel
Mechanical interlock obtained by penetration of bone cement into cancellous bone is critical to the success of cemented total hip replacement (THR)