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In page Congenital trigger thumb:

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It is unclear whether the cause of the trigger thumb is congenital or acquired. The occurrence of bilateral incidence and trigger thumbs in both children of twins are an indication for a congenital cause.[1][2][3] Trigger thumb in children is also associated with trisomy of chromosome 13.[2] For these reasons it was assumed that trigger thumbs in children are to be of congenital cause. However, more and more evidence which point towards an acquired cause have been found in recent studies.[4][5] Therefore, the name pediatric trigger thumb is also widely used (and currently preferred by some) for the same disorder.[citation needed]