I was researching something and this site came up, it's a piece from wacma...and I found it to be quite the resource!
http://www.pressenter.com/~wacma/lisapaper.htm
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Virginia
4 plc fracture of the C1, Tethered Cord, (acquired chiari and elongated brainstem resolved by Tethered Cord surgery); atlanto occipital dislocation and cranial settling all due to equestrian accident,
2004. CC Fusion upcoming.