it is not likely that a chiropractic adjustment caused the arthritis in his back. a teenager with true arthritis is not that common. since there are many different types and severity it may be best for your son to see a specialist in arthritis (rheumatologist) for a second opinion.
my son is 17 & he has been dignosed with athritis in his back. cld chiropractic adjust caused this from when he was 13?