Thoracohumeral muscle activity alters glenohumeral joint biomechanics during active abduction

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
Gerhard G KonradRichard E Debski

Abstract

Normal function of the glenohumeral joint depends on coordinated muscle forces that stabilize the joint while moving the shoulder. These forces can either provide compressive forces to press the humeral head into the glenoid or translational forces that may destabilize the glenohumeral joint. The objective of this study was to quantify the effect of pectoralis major and latissimus dorsi muscle activity on glenohumeral kinematics and joint reaction forces during simulated active abduction. Nine fresh-frozen whole upper extremities were tested using a dynamic shoulder testing apparatus. Seven muscle force combinations were examined: a standard combination and 10%, 20%, or 30% of the deltoid force applied to the latissimus dorsi or pectoralis major tendon, respectively. Pectoralis major and latissimus dorsi muscle activity decreased the maximum angle of glenohumeral abduction and external rotation, and increased the maximum horizontal adduction angle compared to the standard muscle combination. Thoracohumeral muscle activity also created a more anteriorly directed joint reaction force that resulted in anterior translation compared to the standard muscle combination. Therefore, the ratio between anteriorly directed translational fo...Continue Reading

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Citations

Nov 7, 2009·International Orthopaedics·Jörn KircherPeter Habermeyer
Feb 6, 2009·The Journal of Orthopaedic and Sports Physical Therapy·Michael M ReinoldKevin E Wilk
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Nov 23, 2016·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Takayuki NagatomiMinoru Yoneda
Sep 5, 2017·Obere Extremität·Philipp MoroderMarkus Scheibel

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