Donald Corenman, MD, DC
Post count: 8427

I assume that your son suffered a fracture of the joint surfaces of the upper two vertebra (C1-2) and the healing of the bone was somewhat displaced (off-set). This makes the joint surfaces incongruent (creating a step-off). When the two vertebra move on each other, this uneven joint surface “catches” and creates a painful “pop”.

A CT scan can reveal this. Occasionally an MRI can also reveal this finding.

Dr. Corenman