After several days of asking questions and getting no where....Logan's pediatrician decided to call the Down Syndrome Clinic of Wisconsin. At first, Logan's doc was not going to recommend hippotherapy, but couldn't give me any idea of the severity of Logan's AAI. So, I think he felt like he needed to know what is typically done following a positive x-ray for AAI. I'm not sure what will be recommended now, but the DS clinic told Logan's doctor to set Logan up for a sedated MRI and to have a neurosurgeon at the Children's Hospital in Milwaukee read the results.
If you are curious, this is what Logan's results said. (I have to say that Logan cooperated beautifully though!!)
Positioning is less than optimal as a result of poor patient cooperation. There are some findings suggestive of craniocervical assimilation. There appears to be a hypoplastic or absent dens allowing abnormal mobility at the C1-C2 articulation. Depending upon clinical circumstances, CT or MRI could be considered for further evaluation.
I am hoping to know FOR SURE, if we need to limit Logan's activities and if we need to have future exams of his neck.