Some ‘non-nerve compromise’ conditions may benefit in prone flexion.

We created the Neural-flex to afford multiple ‘X’-axis positional iterations. This is because after 50 years of ‘facilitated motion’ research flexion and extension motions/pivoting at the waist can make improvements to disc migration patterns better than neutral positions.
The premise of pre-positioning patients in extension (or flexion) is not new and has been borne out over several decades of ongoing clinical research.

Some patients have confounding s/s and fail to ‘easily-classify’ as directly flexion or extension. Unlike supine positioning which comes in just one ‘variety’ (flexion or hyper-flexion) prone positioning can be a multiplayer: neutral, slight-torso extension, hyper-extension, extension torso & lower-body and lower-body flexion (5-35 degrees).
Neutral is likely the most common with extension (5-25 degrees) next. Hyper-extension and dual (upper & lower) extension less common and more likely needed in patients under 40. Flexion is a transitional-position allowing traction in otherwise difficult to treat conditions i.e. nerve compromise, stenosis etc.

However some 60+ year old patients (prone tolerant) and those demonstrating extension-motion pain reduced with form-closure but otherwise modest compression findings.