I think the M6 L does compress over time, but not enough to be a problem. But then again, they haven't be around long enough to determine that for sure.
The two surgeons you mention, neither of which have done enough M6 implants, don't have the experience you need for an opinion. Not even a dozen combined between them. Try some of the ones mentioned here in these forums that have literally thousands under their belt and get their opinions on your facets.
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Weightlifter since 12 years old, now mid-40's and figuring out this wasn't such a good idea.
Chronic back pain started in 2010 while shrugging weights that a 40 yr. old shouldn't even try.
MRI in 2012 showing L4/L5, L5/S1 herniations and L2/L3 bulge.
L5/S1 taking on new shape, chronic sciatica, etc.
DEXA bone scan performed 5/7/14 showing mild osteopenia.
Surgery performed July 9th, 2014, Dr Clavel, hybrid three level lumbar.
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