The Spondylolithesis is a boney alignment issue and therefore unless the result of an acute feacture does not alter your basic electrotherapy assumptions. They should look to the tissue you are trying to affect, the contraindications and the irritability in relation to the acute/chronic nature of the presentation. i.e. Think about the tissue you are trying to affect, why you are trying to affect it, is it really the issue and then put the usual parameters into place for that.