Thanks all for your insights so far

All the information so far sounds like what I've had a hunch about so far, but been unable to find any written backup to. Will have to try my best to convince the management at my company to spend more on physiotherapy education and less on chairs (they just spent many millions on chair upgrades)

And alophysio - am currently reading thru Diane Lee's "Pelvic Girdle" and finding it extremely dry and slow going but am persisting ...