Analysis On Shoulder Kinematics During Arm Elevation Based On Optical Motion Capture System And Study On Scapulohumeral Rhythm

A solid foundation of knowledge about the kinematics characteristics and coordinated movement of normal scapular and humerus motion during humerothoracic elevation,as well as the contribution of the scapula and the humerus to the overall shoulder elevation,is important when recognizing,evaluating,planning surgical stabilization approaches,assessing patients with shoulder motion abnormalities,designing restorative treatments,or planning conservative rehabilitation exercises for pathologic conditions.As our understanding of scapular kinematics continues to evolve and the needs for patient outcomes relative to these areas changes,the optical motion capture system will continue to provide an affordable and accessible means for quantifying shoulder and scapular kinematics.The AMC was used to record the scapular movement in order to reduce the effect of STA.The shoulder kinematics was performed based on the optical motion capture systems using skin-mounted markers and AMC.The main contents can be included in:(1)In order to assess the accuracy and validity of AMC,kinematics obtained with the AMC were compared to simultaneous SL recordings in a series of postures.The test/retest variability of replacement of the AMC was also assessed.(2)Describe and compare scapulothoracic joint,glenohumeral joint and the scapulohumeral rhythm across different plane of elevation(forward flexion and coronal plane abduction).Meanwhile,we will quantify the contribution of the scapula and the humerus to the whole shoulder elevation.In conclusion,there was no significant difference between the AMC and SL.AMC allows dynamic and unconstrained recording of scapular motion.We could the use of an AMC as part of motion capture protocols evaluating shoulder functional movements.Overall shoulder motion consists of substantial angular rotations at each of the four shoulder joints,enabling the multiple-joint interaction required to elevate the arm overhead.In brief,this original technique may open new horizons leading to improved understanding of shoulder pathologies and opening up new possibilities of analyzing large ranges of shoulder motion,for instance during sports movements.