There are some questions to explore.
First, why did the FDA only approve of one disc replacement. Have there been any studies done on multiple disc replacements vs single disc replacement.
Has your physician done the procedure on single or multiple disc replacements.
The problem with one disc replacement in a multi level severe degenerative disc disease is that the symptoms will not likely decrease until all segments are fixed.
The other question is why not do a lumbar fusion?
Is there a need to do replacement rather than fusion.
In any case, the goal is to relieve pressure on nerve roots which cause neurological symptoms down into the legs. Localized back pain is not guaranteed with lumbar spine or disc surgery but mainly is geared toward relieving neuropathic symptoms.
The procedure which can do this the best in the least amount of operating time is the one to choose.
Tom Plamondon PA-C, PT