Abstract:
Objective：To sum up the clinical WASSEL classification of complex thumb, and to clarify the advantages of surgical treatment.
Methods：A retrospective analysis was made in 170 cases of complex thumb deformity. Through the skin incision design, skeleton establishment, joint repair and functional reconstruction of thumb abduction, congenital thumb deformities were treated surgically.
Results：The score of 45 after operation were in 100 cases,3 points in 65 cases and under 2 points in 5 cases. The shape and function of the thumb were satisfactory in 170 cases. After a followup of 636 months, except 2 cases of scoliosis, 3 cases of joint movement limitation and 6 cases with fingers bigger than the healthy one, all basically met the needs of daily life after rehabilitation training.
Conclusion：In the treatment of congenital thumb deformities, choosing appropriate surgery time according to WASSEL classification can achieve good effect.

Key words: Duplicated thumb deformities, WASSEL classification, Surgery, Secondary deformity, Child