Trigger thumb in children is relatively uncommon and the etiology remains unclear. The purpose of this study is to evaluate the clinical classification of trigger thumb and analyze the post-operative results. Methods: Eighty-six patients (86) with congenital trigger thumb were operated by divided A 1 pulley from 2004 to 2011. Complications were also noted. There are 89 patients (111 thumbs), who had congenital trigger thumbs. Among these type II congenital trigger thumb consisted of 31 (36.5 percent) patients with 39 thumbs, and Type IV consisted of 55 (63.5 percent) patients with 72 thumbs. All patients were operated and each thumb was assessed for full extension at the interphalangeal joint. Results: Postoperatively, 91.9 percent of the surgical corrected thumbs recovered it function well
while only 8.1 percent of the thumbs were fairly recovered. There were no serious complications or recurrent trigger thumb relapsed observed in this study. Conclusions: This study supports the use of corrective surgery for the treatment of congenital trigger thumps.