Mark,
I understand your concerns. What I have learned is that the Spinal Kinetics guys studied the physical characteristics of the human disc and placed these parameters into their test computers, then they began the process of prototyping an implant that replicated these characteristics. The result was a disc that might just be the first to actually deserve the name “artificial disc”. The goal of course is to return the spine to normal function. Now we both know that as the damage from years of degeneration progresses the other structures and tissues become unable to respond normally. The selection of candidates is critical. Surgeon placement errors and patients whose bodies just can’t keep the implants in place will always come up, but overall I think the goal of returning to a normal function is attractive.
Others, Stenum tells me the new insertion process used with M6 means less time in the OR, less blood loss, and seems to have improved the "Primary fixation or the 'stay puttedness' of the device upon implantation" as Mark states.
Joe
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