That link to another thread on SOB carry was interesting. A good example, thanks for that. As a side note, the person who was trying to impress everyone with his "medical knowledge" (who is an MD, by the way) is completely wrong with what he said in that thread. That he was wrong is documented, and can easily be referenced, but hey, he is an MD, so it must be correct
I think this might be me
. I really wasn't trying to impress anyone, I was merely describing a worst case scenario. And while probably rare, the outcomes may be serious and significant enough (from spinal fracture to vertebral slippage, and possible cauda equina syndrome; and I forgot to add possible lumbosacral dislocation, again with possible nerve involvement, including paraplegia etc), that they make SOB carry not worth that risk in my opinion.
Hyperextension in the lower lumbar spine is a commonly understood mechanism behind both spinal fracture (e.g., lumbar spondylolysis) as well as lumbosacral dislocation.
Having a hard object overlying your lower lumbar spine will certainly increase the hyperextension moment in the lower back and clearly only serve to exacerbate the mechanism of injury. Therefore injury from being hit from behind onto the back by a hard tackle, a kick, or falling onto a curb can certainly be worsened by a hard object, such as a gun, overlying the spine. Additional nerve root or cauda involvement is not a predetermined outcome, but depending on the severity of the injury it can, and does, occur.
Best case scenario you get a bruise and a sprain/strain of your lumbar spine, but again, since there are safer alternatives to SOB carry, why risk the potential worst case scenarios that may be associated with SOB carry. And by the way even “just” a spinal fracture without nerve involvement is still in my opinion an obviously unacceptable risk to SOB carry (pain, possible spinal instability, increased future degenerative changes in the spine, future nerve involvement, possible need for spinal fusion etc). I wouldn’t even accept “just” a simple spinous process fracture, offered by the OP as some sort of inconsequential outcome associated with SOB carry. I think it is just simpler to keep the gun in a less risky position, personally. If you are some secret agent man and have to carry SOB, well you might decide to risk it, and that’s fine. I for one, having the perspective of having done Spinal Cord Injury as part of my training, have decided that it is probably not worth it for most, even though the possible risk might be small, again due to the fact that the range of possible injuries can extend into the very serious range, as far as I’m concerned.
As far as documentation goes: just because no cases have been documented doesn’t mean that no cases exist; they simply might not have been documented yet. Usually traumatic spine fractures, and spinal cord injuries associated therewith are simply reported as “SCI secondary to traumatic spinal fracture”, or something similar. To find out the exact mechanism of the injury one would have to do a chart review.
I think the reason why no researcher has looked at this is because the potential theoretical risk is so high, and the solution so simple (to simply not carry SOB), that it would be considered a waste of resources to study this issue. Perhaps some cadaveric studies would be useful, where one can put a gun onto the lumbar spine and deliver blows of various strengths to the lumbar spine, and compare the injuries produced to blows sans gun/object. But again, I don’t think you’ll have anyone funding this type of research since it is simply easier to not carry anything overlying the small of the back.
I am not a surgeon and it would be interesting to hear from a spine surgeon on this topic, however in my opinion as a rehabilitation, sports, musculoskeletal and interventional spine physician the cost/benefit analysis as applied to most people does not favor SOB carry, even though the potential catastrophic sequelae associated with SOB carry are admittedly rare. But on the other hand it is also rare to be kicked in the back or to fall onto a curb, but if it does happen, I think that you would be glad not to have your gun carried SOB.
But it’s your back, and you can treat it accordingly.