waxfoot, although I can't remember every message on this thread I have followed it from start to here and there are people on this thread who said they made their backs worse with squats/deadlifts. If the physio or specialist says its alright to go ahead and do them, then that's different.
PS how did you go with your visit to the specialist - reveal anything?
Not sure if I elaborated in that other thread that we touched on the subject, but the TL;DR of it is, that there's nothing on the MRI that stands out as "whoaa, that's clearly the issue here", but given that I've had 6 years of pain, there must be something there, as I'm certainly not imagining it. I'm going for further scans to see if anything else shows up, as the aggressive treatment of fusing has a high failure rate in pain treatment.
The longer version.
I have;
Lost weight (not that I carried too much but im pretty low fat % right now, as low as whenI was in high school), been to physio, been to physiologist, been to chiro, osteo, seen an MD, do Yoga, work out correctly.
I'm a man of science and data, so even though some of the "experiments" above go against my natural inclination of dismissing anything that's not proven, I gave it all a go.
I did a bit of a "back pain diary" since November last year, where I rated every day's pain out of 10, 10 being the worst and 1 being the lowest. The count's been about 8 days where I'd rate it as 3 or 4 / 10. At the moment, I'm going through the worst patch yet, where the constant jabbing of knives into what feels like a raw . tender back is just not funny anymore.
The short of it, is that the specialist now wants to do a CT spectsomething scan, where they inject nuclear sh!t into my vein, so that they can get a high contrast pic of my lumbar spine. He thinks the cause is discogenic (disk related), between the L5 and S1 vertebrae. There's deterioration of the disk and fluid loss, but he says that it's quite normal, and most people are a-symptomatic.
As someone who has raced downhill bikes, I've fucked myself good and proper (broken bones, torn ligaments, dislocations etc), I can tell the difference between different types of pain. My back pain "feels" like it's "bone" pain.
At the moment, I'm just working up the courage to go for the next scan, as I'm a recovering needle-phobe ... so the prospect of a needle in my arm scares the sh!t out of me