Akbarnia B A, Heydarian K, Ganjavian M S
J Pediatr Orthop. 1983 Sep;3(4):502-4. doi: 10.1097/01241398-198309000-00016.
The cases of monozygotic twins with concordant congenital spine deformity are presented. It is suggested that genetics, environment, or a combination of the two factors (multifactorial) might have been the cause of the anomalies. The insult may have been caused by hypoxia to both embryos.