Spondylolisthesis

"Spondylolisthesis"[Mesh] is pretty straightforward, however, if you need to do any keywording:

spondylolisthes*[tiab] or spondylisthes*[tiab] or spondyloptos*[tiab] or anterolisthes*[tiab] or retrolisthes*[tiab]

Ovid:
exp Spondylolisthesis/

(spondylolisthes* or spondylisthes* or spondyloptos* or anterolisthes* or retrolisthes*).ti,ab.

And this is one of those rare occurrences where the Medline and EMBASE terms are exactly the same!