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Elucidating the scapulo-humeral rhythm calculation: 3D joint contribution method

Author

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  • Xavier Robert-Lachaine
  • Patrick Marion
  • Véronique Godbout
  • Jacinte Bleau
  • Mickael Begon

Abstract

The scapulo-humeral rhythm quantifies shoulder joint coordination during arm elevation. The common method calculates a ratio of gleno-humeral (GH) elevation to scapulo-thoracic upward rotation angles. However the other rotations also contribute to arm elevation. The objective is to propose a 3D dynamic scapulo-humeral rhythm calculation method including all rotations of the shoulder joints and compare with the common method. Twenty-nine skin markers were placed on the trunk and dominant arm of 14 healthy males to measure shoulder kinematics. Two-way repeated measures ANOVAs were applied to compare the two methods of calculation of joint contributions and scapulo-humeral rhythm during arm elevation. Significant main effects (p < 0.05) were observed between methods in joint contribution angles and scapulo-humeral rhythms. A systematic overestimation of the GH contribution was observed when only using the GH elevation angle because the scapula is moved outside a vertical plane. Hence, the proposed 3D method to calculate the scapulo-humeral rhythm allows an improved functional shoulder evaluation.

Suggested Citation

  • Xavier Robert-Lachaine & Patrick Marion & Véronique Godbout & Jacinte Bleau & Mickael Begon, 2015. "Elucidating the scapulo-humeral rhythm calculation: 3D joint contribution method," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 18(3), pages 249-258, February.
    • Handle: RePEc:taf:gcmbxx:v:18:y:2015:i:3:p:249-258
    DOI: 10.1080/10255842.2013.792810
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    Cited by:

    1. Umile Giuseppe Longo & Sergio De Salvatore & Arianna Carnevale & Salvatore Maria Tecce & Benedetta Bandini & Alberto Lalli & Emiliano Schena & Vincenzo Denaro, 2022. "Optical Motion Capture Systems for 3D Kinematic Analysis in Patients with Shoulder Disorders," IJERPH, MDPI, vol. 19(19), pages 1-16, September.

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