Baseball Injury or growing pains??

What you described could cause pain in anyone's back, trust me on that one. Our bodies were not created perfectly.

I am a strong advocate of chiropractic care as long as there is no serious issues (fractures, etc) and I know many players who see them regularly. In fact, many trainers will suggest a chiropractor to players for manipulation if they have found no specific reason for back or neck pain. What you have describes could be a very mild form of scoliosis. Don't panic, both my kids have it and so do I and so does most of the general population.

I am on son's case now to get back to a chiropractor. A good sign to look for from the above, is to look at the sole of shoes that one wears, if worn very unevenly, you got issues that might cause back issues.

I learned that from my marketing days working with a chiropractor.

I think it would be difficult for baseball to create a difference in bone stucture.

A visit to a good specialist sounds in order.

My son received an injury like this when he was tackled from behind in a s*o*c*c*e*r game (bad word). We went to the doctor who said he'd get over it. We then went to a chiropractor that gave him some relief. Weight lifting (with a physical trainer) lined him up just right.

If the pain continues I'd recommend seeing a sports doctor who is familiar with Spondylolysis, a stress fracture of the pars interarticularis. There are some very simple clinical tests they can do to check for it and if those tests are positive they'd either do an MRI or a bone scan. They'll have to take x-rays first to please the insurance company but the x-rays often don't find anything.

It doesn't really sound like that's the problem but it certainly could be. If a person who is still growing and plays sports goes to a doctor for lower back pain there's about a 50% chance that it is Spondylolysis. Just because the chiro says there's a misalignment doesn't mean that's the root cause of the pain even if he can provide temporary relief.

If he does have Spondy and continues to play baseball, without giving it a chance to heal it could cause permanent damage so it isn't worth taking a chance.

As TPM notes, there are different things that can cause this. It could be a shortened Quadratus Lumborum, or even a bony anomaly like CADad suggests. Look for an alignment specialist that can diagnose the cause, not just provide temporary relief. Unless there's something you haven't shared, it sounds like the spine doc may have wiffed on this most important detail. I strongly urge you to consider an ortho referral. A good PT can probably analyze and treat the problem as well. Good luck and let us know what happens.