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Journal of the Korean Society for Surgery of the Hand 2006;11(3):129-142.
Published online September 1, 2006.
Secondary Deformity of Thumb Polydactyly ; Classification Based on the Axis Deviation
Joon Kyu Park, Jae Hoon Chung, Sung Tack Kwon
축 편위를 기준으로 분류한 수무지 다지증의 이차변형
박준규, 정재훈, 권성택
Commonly used classification systems for polydactyly of the thumb, such as Wassel-Egawa classification, are not suitable for the secondary deformity. Moreover, the previous classifications do not correlate to the operative planning and prognosis. Therefore, we have developed a new classification for the secondary deformity, which correlates to the operative planning and prognosis. We reviewed 57 consecutive cases of 54 patients who had undergone operations to correct the secondary deformity from March, 1996 to June, 2006. The main reason for dissatisfaction after polydactyly correction was the axis deviation. There was a definite difference in operative planning and prognosis between presence and absence of the axis deviation. We identified 3 more factors which were related to operative planning and prognosis. The new classification describes the 4 factors in order of their importance- 1)axis deviation(Type A/B, absence/presence), 2)composition(Subtype I/II/III), 3)severity(Grade a/b/c) and 4)location(1/2/3). The new classification has closer correlation to the operative planning and prognosis. Also, it suggests several policies of the primary cor correction to reduce the secondary deformities.
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