I disagree, u can diagnose where a prolapse disc is but i'd rather use the term protrusion as prolapse discs would most likely be sequestered anyway. Only in large derangements may the problem be difficult but then again sensory amd motor deficits will point to where the likely problem is. SLR is a neurodynamic test true, but it tests for the tension in the sciatic nerve so it helps to eliminate source when assessed with a prone knee bend(femoral nerve test). The physical examination of the spine is a full one just basing it alone on palpation and SLR is primitive.Palpation should be the very last thing done as your examination from history and physical would point to where u should palpate. U only get mmisguided when you palpate randomly first.Any swollen nerve root, if it is not the sheath alone that is damaged will refer where that nerve root goes. So true acute nerve root dural sheath lesions can be confusing because referal is everywhere, up and down and around the torso, howver if the root is affected then u can say where it is. in addition, ur examination should look at the Wikipedia reference-linksacroiliac joint, and hip to be sure it is not a misguided referal.