mstikes,
I don't see the axial (horizontal) slices that correspond to the herniation. How are your legs weak? If you are talking about the big muscles that pull your knees to chest, my (layperson's) understanding is that it must be coming from higher than L4. I'm on the way home from Europe now. Feel free to call me Thursday or Friday at the number on the GPN website linked below.
Mark
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