Kumar V P, Satku K, Balasubramaniam P
Department of Orthopaedic Surgery, National University of Singapore.
Clin Orthop Relat Res. 1989 Jul(244):172-5.
The role of the tendon of the long head of the biceps in the stabilization of the head of the humerus was studied in 15 freely hanging anatomic specimen shoulders. Upward migration of the humeral head was measured by noting any reduction in the acromiohumeral distance in roentgenograms of the shoulder. There was a statistically significant decrease in the acromiohumeral interval on tensing the short head of biceps, but there was no significant change in the interval on tensing either the long head or both heads of the biceps brachii. Severing the tendon of the long head while both the heads were tensed caused a significant upward migration of the head of the humerus. One of the important functions of the long head of the biceps is to stabilize the humeral head in the glenoid during powerful elbow flexion and forearm supination by the main muscle. Sacrifice of the intraarticular segment of this tendon in surgical procedures of the shoulder may produce instability and dysfunction.
在15个自由悬吊的肩部解剖标本上，研究了肱二头肌长头肌腱在稳定肱骨头方面的作用。通过观察肩部X线片上肩峰肱骨头间距的减小情况来测量肱骨头的向上移位。在紧张肱二头肌短头时，肩峰肱骨头间距有统计学意义的减小，但在紧张肱二头肌长头或肱二头肌的两个头时，该间距无显著变化。在两个头都紧张的情况下切断长头肌腱会导致肱骨头明显向上移位。肱二头肌长头的重要功能之一是在主要肌肉强力屈肘和前臂旋后时稳定肱骨头在关节盂内的位置。在肩部手术中牺牲该肌腱的关节内部分可能会导致不稳定和功能障碍。
