Years late but I can clarify. There are 3 reasons for "wry neck:
1) vit E deficiency
2) vit B deficiency
3( cervical sciñoliosis (bone malformation
The first two can appear just as they hatch, but might develop later. They are easy to treat, but as it's difficult to tell which vitamin is missing, I usually treat them with both. Careful with vitaminE: it has to be supplemented by selenium, but it is tocic, so dont overdose. Vitamin B is harmless and hidrosoluble (excess is excreted in urine) so no risk of overdose there. Chicks recover in a week maximum, sometimes even within the first 24h of treatment. Severe cases will need initial help to drink or feed.
Thr third case is tipycal in broiler chickens. It is caused by anatomical malformation of the bone. As far as I know, it cannot be treated. If the chick can feed and drink on it's, I let them live their own happy crooked-neck lives!