[Definition] Putting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a body part [Value] R [Root Operation] 
Replacement
I n s e r t i o n
R e p l a c e m e n t
R e m o v a l
C h a n g e
R e v i s i o n
S u p p l e m e n t