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Congenital trigger thumb, (or Pediatric trigger thumb), is a trigger thumb in neonates and young children. Triggering, clicking or snapping is observed by flexion or extension of the interphalangeal joint (IPJ). In the furthest stage, no extension is possible and there is a fixed flexion deformity of the thumb in the IPJ. Etiology, natural history, prognosis and recommended treatment are controversial. ==Etiology== 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.〔 〕 Trigger thumb in children is also associated with trisomy of chromosome 13.〔 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. Therefore the name pediatric trigger thumb is also widely used (and currently preferred by some) for the same disorder. ==Epidemiology == Not much research has been done on the epidemiology of congenital trigger thumbs. There are a few reports on the incidence in their respective studies. The most recent data comes from a Japanese study by Kukichi and Ogino where they found an incidence 3.3 trigger thumbs per 1,000 live births in 1 year old children.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Congenital trigger thumb」の詳細全文を読む スポンサード リンク
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