The objectives of this study were to describe a technique for measuring in-vivo glenohumeral joint contact patterns during dynamic activities and to demonstrate application of this technique. The experimental technique calculated joint contact patterns by combining CT-based 3D bone models with joint motion data that were accurately measured from biplane x-ray images. Joint contact patterns were calculated for the repaired and contralateral shoulders of 20 patients who had undergone rotator cuff repair. Significant differences in joint contact patterns were detected due to abduction angle and shoulder condition (i.e., repaired versus contralateral). Abduction angle had a significant effect on the superior/inferior contact center position, with the average joint contact center of the repaired shoulder 12.1% higher on the glenoid than the contralateral shoulder. This technique provides clinically relevant information by calculating in-vivo joint contact patterns during dynamic conditions and overcomes many limitations associated with conventional techniques for quantifying joint mechanics.

中文翻译：

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盂肱关节接触模式的体内测量。

本研究的目的是描述一种在动态活动期间测量体内盂肱关节接触模式的技术，并展示该技术的应用。该实验技术通过将基于 CT 的 3D 骨骼模型与从双平面 X 射线图像准确测量的关节运动数据相结合来计算关节接触模式。计算了 20 名接受肩袖修复的患者的修复肩部和对侧肩部的关节接触模式。由于外展角度和肩部状况（即修复与对侧），检测到关节接触模式的显着差异。外展角对上/下接触中心位置有显着影响，修复肩部的平均关节接触中心为 12。关节盂比对侧肩高 1%。该技术通过计算动态条件下的体内关节接触模式来提供临床相关信息，并克服了与量化关节力学的传统技术相关的许多限制。