Lee Y H, Chun S I
Department of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea.
Yonsei Med J. 1991 Mar;32(1):87-90. doi: 10.3349/ymj.1991.32.1.87.
Although pectoralis major plays an important role as a prime or assistant mover for the varied range of shoulder movement, there was no significant functional loss in ordinary activities in case of congenital absence of this muscle, because of compensation of surrounding muscles. This report describes a 22-year-old soldier with unilateral congenital absence of pectoralis major, who had difficulties in specific upper extremity movement, such as throwing or climbing. There was no visible or radiological evidence of associated anomalies of ipsilateral upper extremity. Electrodiagnostic study showed normal findings except delayed latency of medial pectoral nerve supplying rudimentary pectoralis minor of the involved side. On isokinetic study of movement for both shoulders, peak torque and average power for horizontal adduction were markedly-diminished on the involved side.
尽管胸大肌作为肩部多种活动的主要或辅助推动者发挥着重要作用，但在先天性胸大肌缺如的情况下，由于周围肌肉的代偿作用，日常活动中并无明显功能丧失。本报告描述了一名22岁的单侧先天性胸大肌缺如的士兵，他在特定的上肢运动，如投掷或攀爬方面存在困难。同侧上肢没有可见或影像学证据表明存在相关异常。电诊断研究显示，除了供应患侧发育不全的胸小肌的胸内侧神经潜伏期延迟外，其余结果均正常。在对双肩运动进行等速研究时，患侧水平内收的峰值扭矩和平均功率明显降低。
