Chris,
Have you consulted with Bertagnoli in Bogen?
He is also a ProDisc L user and it's very early yet (under 6 months) but I spent 8 hours on a mtn bike last weekend......
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Dec 1/15 - 3 level ADR from S1/L3 c/w 360 mobility preservation at L3/L4 for Spondylolisthesis done by Dr. Bertagnoli in Bogen GmbH.
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