Roetman B, Wuelker N, Plitz W
Orthopädische Klinik, Medizinischen Hochschule Hannover.
Biomed Tech (Berl). 1996 Dec;41(12):359-63. doi: 10.1515/bmte.1996.41.12.359.
The article discusses a dynamic shoulder model capable of simulating the forces generated by the rotator cuff and the deltoid muscle, and elevation movements of the glenohumeral joint using, a computer-aided servohydraulic unit. In 10 cadaver shoulder specimen, the effects of the loss of function of the supraspinatus muscle on maximum elevation was determined with an ultrasound system. Changes in the so-called impingement pressure below the coracoacromial arch were determined with the aid of capacitive pressure sensors. With the supraspinatus muscle inactive/ absent, the maximum elevation of the humerus showed a decrease of 6% (p < 0.05), which, however, was overcome by an increase in deltoid power of only one-third of the supraspinatus muscle power loss. For a simulated isolated supraspinatus defect, the subacromial pressure below the coracoacromial arch decreased by 8% (p > 0.05). These results confirm clinical investigations showing that isolated lesions affecting the supraspinatus tendon often fail to produce symptoms and thus require no surgical reconstruction.
本文讨论了一种动态肩部模型，该模型能够使用计算机辅助伺服液压装置模拟肩袖和三角肌产生的力以及盂肱关节的抬高运动。在10个尸体肩部标本中，使用超声系统确定了冈上肌功能丧失对最大抬高的影响。借助电容式压力传感器确定了喙肩弓下方所谓撞击压力的变化。当冈上肌不活动/缺失时，肱骨的最大抬高降低了6%（p<0.05），然而，仅通过增加三角肌力量来弥补冈上肌力量损失的三分之一，就克服了这一降低。对于模拟的孤立性冈上肌缺损，喙肩弓下方的肩峰下压力降低了8%（p>0.05）。这些结果证实了临床研究结果，即影响冈上肌腱的孤立性损伤通常不会产生症状，因此无需手术重建。
