Chuck,
I don't think they go all the way through. It is a precise measurement of where the notch is chiseled. That is one of the reasons I liked the ProDisc. It took away the doctors gestimations of where to put the plates.
It took 6 week for the bone pain to subside for me. Placing the keel is like breaking a bone and I sure know what bone pain feels like and that was what I felt after surgery. It has to be even greater with 2 levels.
__________________
Paulette
ProDisc L5-S1 W/Dr Delamarter Aug 23, 2005
L5-S1 DDD Diagnosis 12/04
T-12 Compression Fracture 10/04
C-7 Spines Process Fracture 5/99
http://prodisc2.blogspot.com/
You are my Rock God in you I can do anything
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