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I ran across this article while doing some peer reviewed research on care of spondylolisthesis. Pay attention to the last paragraph and the last source:

http://www.dynamicchiropractic.com/mpacms/dc/article.php?id=50490

I wonder if anyone out there is familiar with any good evidence, RCT's etc. that supports the author's claim:

Another important consideration for long-term support of the spondylolisthetic spine is the use of custom-made orthotics. Since many of these patients have low or absent arches in their feet, the additional support from a pair of custom-made orthotics frequently is necessary. In fact, lower-extremity misalignments such as leg-length discrepancies and pronation problems are often are associated with chronic pelvic and low back symptoms.10

*10. # Rothbart BA, Estabrook L. Excessive pronation: a major biomechanical determinant in the development of chondromalacia and pelvic lists. J Manip Physiol Therap 1988;11:373-379. ;)

 

Of course there's not. Even the reference cited does not support the claim, let alone being credible on its own ;)

That does not necessarily mean that if the foot is having significant proximal effects that a clinical judgement should not trial foot orthotics in these cases.