Specific kinematics and associated muscle activation in individuals with scapular dyskinesis

Huang, Tsung-Hui; Ou, Hsiang-Ling; Huang, Chien-Ying; Lin, Jiu-Jenq

doi:10.1016/j.jse.2014.12.022

Cited by 92 publications

(80 citation statements)

References 39 publications

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“…14 Alterations in scapular muscle activity, including trapezius, serratus anterior, and rhomboid muscles, as well as tightness of soft tissues have been reported to be associated with scapular dyskinesis. 14,23 In this regard, increased activity of upper trapezius with inhibited activity of lower trapezius and serratus anterior has been suggested to be related to altered scapular kinematics, such as decreased upward rotation, decreased scapular posterior tipping, and external rotation. 14,16,23 Several authors have emphasized the role of exercise therapy in restoring normal scapular kinematics.…”

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confidence: 99%

“…14,23 In this regard, increased activity of upper trapezius with inhibited activity of lower trapezius and serratus anterior has been suggested to be related to altered scapular kinematics, such as decreased upward rotation, decreased scapular posterior tipping, and external rotation. 14,16,23 Several authors have emphasized the role of exercise therapy in restoring normal scapular kinematics. 7,16 Thus, scapula-focused exercise therapy is considered an important physiotherapy intervention in individuals with SIS and scapular dyskinesis.…”

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confidence: 99%

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Exercise therapy may affect scapular position and motion in individuals with scapular dyskinesis: a systematic review of clinical trials

Moghadam

Rahnama

Dehkordi

et al. 2020

Journal of Shoulder and Elbow Surgery

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mentioning

confidence: 99%

mentioning

confidence: 99%

Exercise therapy may affect scapular position and motion in individuals with scapular dyskinesis: a systematic review of clinical trials

Moghadam

Rahnama

Dehkordi

et al. 2020

Journal of Shoulder and Elbow Surgery

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“…The results indicated that activation of the scapular muscles plays primary roles as stabilizers and secondary roles as movers of the scapula in patients with pattern II dyskinesis. This may explain why specific muscle activities and theoretically associated scapular kinematics were not found to be highly related in past research 26 . Clinically, this raises the question of whether specific muscle training can change scapular kinematics 27–29 .…”

Section: Discussionmentioning

confidence: 87%

“…validated scapular kinematics between skin-based sensor and bone-pinned methods and confirmed that the skin-based method is valid when arm elevation is below 120 degrees 31 . The details of the methodology can be found in a previous paper 26 . Three sensors were placed in locations where the skin motion artifact was minimized (sternum, acromion, distal humerus).…”

Section: Methodsmentioning

confidence: 99%

Movement Pattern of Scapular Dyskinesis in Symptomatic Overhead Athletes

Huang

Lin

et al. 2017

Sci Rep

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This study investigated the characteristics of arm elevation via principal component analysis in symptomatic overhead athletes with scapular dyskinesis. One hundred-thirty-four overhead athletes with scapular dyskinesis [24: inferior angle prominence (pattern I); 46: medial border prominence (pattern II), 64: pattern I + II] were evaluated by three-dimensional electromagnetic motion and electromyography to record the scapular kinematics (upward rotation/posterior tipping/exterior rotation) and muscle activation (upper trapezius: UT; middle trapezius: MT; lower trapezius: LT; serratus anterior: SA) during lowering phase of arm elevation. The results showed: (1) for pattern I and II, the first 3 principal component (PCs) explained 41.4% and 42.6% of total variance of movement; (2) the first PCs were correlated with MT, LT activity (r = 0.41~0.61) and upward rotation, posterior tipping (r = −0.59~−0.33) in pattern I, and UT, MT, SA (r = 0.30~0.70) activity in pattern II; (3) contour plots of muscle activity demonstrated that muscle activities varied with dyskinesis patterns. In summary, for the pattern I, the major characteristics are coactivation of MT and LT and corresponding scapular posterior tipping and upward rotation. For the pattern II, the major characteristics are coactivation of UT, MT and SA without corresponding scapular external rotation.

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“…However, it may be inappropriate to extrapolate the activation of one part of serratus anterior to the muscle as a whole if it consists of morphologically and functionally distinct subdivisions. Previous electromyographic (EMG) studies have mostly examined the activity of serratus anterior as a relatively homogenous muscle during a variety of functional activities and rehabilitation exercises (Alizadehkhaiyat et al, 2015;Huang et al, 2015;Maenhout et al, 2016;San Juan et al, 2016). Typically these studies use electrodes only in one location on the muscle to evaluate the effect of functional activities and exercises on serratus anterior as one whole muscle.…”

Section: Introductionmentioning

confidence: 99%

A novel cadaveric study of the morphometry of the serratus anterior muscle: one part, two parts, three parts, four?

et al. 2016

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calculated. Three subdivisions of serratus anterior were identified. A new finding was the discovery of two distinctive fascicles attached to the superior and inferior aspects of rib 2.The rib 2 inferior fascicle had the largest PCSA (mean 1.6 cm 2 ) and attached, with the rib 3 fascicle, along the medial border of scapula to form the middle division. The rib 2 superior and rib 1 fascicles attached to the superior angle of scapula (upper division).Fascicles from ribs 4 to 8/9 attached to the inferior angle of scapula (lower division).Mean fascicle angle relative to a vertical midline reference and PCSA for each division were 29 o and 1.3 cm 2 (upper), 90 o and 2.2 cm 2 (middle), and 59 o and 3.0 cm 2 (lower).This novel study demonstrated the presence of morphologically distinct serratus anterior subdivisions. The results of this study will inform the development of optimal techniques for the assessment, treatment and rehabilitation of this architecturally complex muscle in shoulder and neck pain.

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Specific kinematics and associated muscle activation in individuals with scapular dyskinesis

Cited by 92 publications

References 39 publications

Exercise therapy may affect scapular position and motion in individuals with scapular dyskinesis: a systematic review of clinical trials

Exercise therapy may affect scapular position and motion in individuals with scapular dyskinesis: a systematic review of clinical trials

Movement Pattern of Scapular Dyskinesis in Symptomatic Overhead Athletes

A novel cadaveric study of the morphometry of the serratus anterior muscle: one part, two parts, three parts, four?

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