Lister G
Division of Plastic Surgery, University of Utah, Salt Lake City 84132.
J Hand Surg Am. 1991 Jul;16(4):626-33. doi: 10.1016/0363-5023(91)90185-e.
Pollex abductus is an anomaly in which the flexor pollicis longus attaches not only at its customary insertion, but also into the extensor by a tendon that passes around the radial aspect of the thumb. Contraction of the anomalous flexor abducts the thumb. In the original report, the anomaly occurred in thumb hypoplasia. A similar anomaly is reported in 11 hypoplastic thumbs (35.5% of all cases) and in 9 cases of radial polydactyly (21.4%). The common feature was poor definition of the interphalangeal skin crease, with complete absence of active flexion of that joint. All patients were treated surgically; 13 before the age of 10 months, with correction of the duplication and the hypoplasia, and in the latter with elimination of the abduction deformity and restoration of opposition. The anomalous connection was excised in all patients. Active interphalangeal joint motion after reconstruction of the hypoplastic thumbs averaged 21 degrees.
拇外展畸形是一种异常情况，其中拇长屈肌不仅附着于其通常的止点，还通过一条绕过拇指桡侧的肌腱附着于伸肌。异常屈肌的收缩会使拇指外展。在最初的报告中，这种异常发生于拇指发育不全。在11例发育不全的拇指（占所有病例的35.5%）和9例桡侧多指畸形（21.4%）中报告了类似的异常情况。共同特征是指间皮肤褶皱不清晰，该关节完全缺乏主动屈曲。所有患者均接受了手术治疗；13例在10个月龄前接受治疗，矫正重复和发育不全，对于后者则消除外展畸形并恢复对掌功能。所有患者均切除了异常连接。发育不全拇指重建后指间关节的平均主动活动度为21度。
