Hi Laura:
The facet joints, from what I see, are on the very edge of where the implant would be, therefore if the keel is narrow, as in the Maverick, then the force of it into the bone during insertion would be less pressure on the facet joints and less incidence of fracturing them during insertion, or other future problems. The Pro Disc L has a wider keel, and and so it could fracture the facet joints during insertion and/or cause other problems related to the facet joints because the ends of it are so close to it, from what I read.
Lori
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