New Parameters for Modeling Shoulder Motion

R.M. Kiss and Á. Illyés (Hungary)

Keywords

Biomechanics, shoulder joint, shoulder joint kinematics, rotation centers, range of angle

Abstract

In order to analyze shoulder joint movements, the authors use a ZEBRIS CMS-HS ultrasound-based movement sensor and a related measurement program developed by them. In essence, the measurement involves the determination of the spatial position of the 16 anatomical points specified on the basis of the coordinates of ultrasound-based triplets positioned on the upper limb, the scapula, and the thorax, measured in the course of motion. The kinematic characteristics of motion were identified by scapulothoracic, glenohumeral, and humeral elevation angles; range of angles; scapulothoracic and glenohumeral rhythm; scapulothoracic, glenohumeral, and scapuloglenoid ratios. Motion of the humerus and the scapula relative to each other was characterized by the rotation center of the two bones, and their absolute and relative displacement relative to each other. The biomechanical model of the shoulder joint during elevation can be described by analyzing the results of the measurements performed.

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