zxc: sorry, I missed the first part of your post. Didn't mean to be rude. I don't know of anyone injured from falling on an SOB holster. It seems pretty obvious, however, that it will damage the spine. That's worse than damaging soft tissue or the hip. It's an awkward position for a draw. There are times it would be appropriate, but most people will never be in them.
I'll take your word on the medical parlance of the spinal cord. There are major nerves down there, however, and I do personally know someone who was crippled, nearly paraplegic, from a strike to the coccyx. I won't risk mine.
As to "chiropractors are quacks," as I said, it depends. Mine used to be head of orthopedic surgery at a major hospital. I assume he knows his way around the spine. ;-)
Thing is, I know of many people crippled from surgery. I don't know of any crippled by a chiropractor. And what mine charges, even if I went weekly (I go every 6 months to two years when I forget to exercise enough and my 12 degree scoliosis seizes my traps up) he'd be cheaper over my lifetime than surgery. And I don't have to sign a waiver that if I wind up crippled it's not his fault and he keeps the $50K for trying. (Would you let a mechanic get away with that? "We're going to rebuild your engine, but if the car won't start, it's not our fault!") And I'd have to say that if your doctor won't answer that question, HE's the quack. ;-) Mine recommends against it. "It will certainly exacerbate any injuries you do sustain," he says.
There are things I see doctors for, like my still undiagnosed stomach problem that's either esophagitis or an ulcer. There are things I see a chiropractor for, like tendonitis in the wrists from writing 10,000 words a day or playing guitar, or my neck seizing up.
There's also things I use a .380 for and things I use a .45 for. And even things I'd reluctantly use a SOB holster for, if I needed to. Right application and the right tool.
I'd guess that given the tiny number of people carrying that way, the number of them involved in an altercation and the number actually falling backwards, it's a small number.
So is the number of people who have lethal accidents while drinking and skydiving. But I don't drink when I jump.
So is the number of people who lose fingers to wedding rings, though my father arced out a 100kV box and got UV burns up his arm from the flash, and my father-in-law got his burned to the flesh when it soaked up IR from a laser. None of us wear rings anymore.
Do keep us posted on your findings, though. I am curious as to the results.
I think you're much less likely to land so as to injure the kidney, more likely to fall on the hip, but it can take a bit of beating (albeit painfully). And if the incident gets that far, it's going to suck no matter what happens.
Your mileage may vary.
And don't call me "Sir." My parents were married.