Congenital absence of thenar muscles was seen in 14 hands of 8 patients, an d congenital dysplasia of fingers was seen in 4 hands of 3 patients.

• 其中,涉及拇指影响拇指功能的8例14侧,涉及其他手指或腕关节的3例4侧。统计受累肌肉以大鱼际肌为主,肌腱移位为主要的治疗方法。