  Hip joint socket. 
This is the other half of an artificial hip joint you can see under cobalt, the socket into which the ball from that part fits into.  The outer surface is a wonderful matrix of sintered titanium balls (very small), for the hip bone to grow into, firmly attaching the socket to the bone. 
Source: Paul Wellin 
Contributor: Paul Wellin 
Acquired: 14 June, 2002 
Text Updated: 16 March, 2009 
Price: Donated 
Size: 2.25" 
Purity: >90% 
Sample Group: Body Parts+Medical
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