A standard MRI will not show the fine injuries common to concussion. A generic chiro is also not much help. If fact, if he did twist the head and pop the neck, he may have made it worse.

An MRI with the head turned sharply to the right and the left may show the lack of stability at atlas (C-1) to skull base (occiput).

btw, An MRI will never show a need for a chiropractic adjustment. Plus, a radiologist would not be looking for the signs of needing a chiro adjustment. M.D.'s and D.C. don't mix.

A good chiro may refer a patient to an MD but an MD will never refer a patient to a chiro.