I only just read this but I would like to add to AussiePhysio's comments. I also use repeated movements with my low back assessments however sometimes I find repeated motions in standing can also increase a patients pain, and confound results. This is usually with the more acute cases. So I always add prone bilateral LE manual traction as an assessment, and prone on elbows. Also sometimes you may have to have them lay over a pillow or two as the extension from laying flat maybe too much.
Just my 2 cents for additional screens I use.