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Strength Ratio of Rotator Cuff Trans...

Wang, Jingxuan,

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Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears // Jingxuan Wang.
Author:	Wang, Jingxuan,
Description:	1 electronic resource (90 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-10.
Contained By:	Masters Abstracts International86-10.
Subject:	Bioengineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31934681
ISBN:	9798314803899

Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears /
Wang, Jingxuan,

Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears /Jingxuan Wang. - 1 electronic resource (90 pages)

Source: Masters Abstracts International, Volume: 86-10.

The rotator cuff muscles play a crucial role in maintaining glenohumeral joint stability. They form a force couple in the transverse plane, with the subscapularis translating the humeral head anteriorly and medially, while the infraspinatus and teres minor translate the humeral head posteriorly and medially relative to the glenoid. A balanced force couple (i.e., strength ratio: [infraspinatus + teres minor]/subscapularis * 100% ≈ 100%) might minimize glenohumeral glide/translation during shoulder motion and improve joint stability, potentially informing the design of exercise therapy for managing supraspinatus tears.Therefore, the purpose of this study was to investigate the relationship between the strength ratio of the rotator cuff transverse force couple and glenohumeral arthrokinematics/kinematics during scapular plane abduction in individuals with symptomatic rotator cuff tears isolated to the supraspinatus tendon. It was hypothesized that a non-linear relationship would exist between the strength ratio and the range of glenohumeral anterior-posterior glide/translation, with a strength ratio of approximately 100% being associated with minimized anterior-posterior glide/translation.Forty-nine subjects with symptomatic supraspinatus tears (25 males, 24 females; age: 60 ± 8 years) were included in the study. Isometric rotator cuff strength was assessed by a physical therapist using a hand-held dynamometer. In vivo glenohumeral arthrokinematics/kinematics during scapular plane abduction were assessed using bi-plane radiography and a validated model-based tracking technique. Polynomial regressions were utilized to determine the associations between the strength ratio and glenohumeral arthrokinematics/kinematics. Significance was set at p < 0.05.The results indicated no relationship between the strength ratio and glenohumeral arthrokinematics/kinematics during scapular plane abduction in individuals with symptomatic supraspinatus tears. This was consistent before and after exercise therapy, regardless of tear type (partial- or full-thickness) or sex. A possible explanation for this lack of association is that this population retains an intact transverse force couple, functional deltoid and surrounding shoulder musculature, and intact static stabilizers. These structures likely maintain central compression of the humeral head within the glenoid, thereby diminishing the impact of the transverse force couple strength ratio on glenohumeral arthrokinematics/kinematics. These findings highlight the importance of enhancing overall shoulder strength and function, which should be a primary goal of exercise therapy.

English

ISBN: 9798314803899Subjects--Topical Terms:

657580
Bioengineering.
Subjects--Index Terms:

Rotator cuff

Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears /
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245 1 0 $a Strength Ratio of Rotator Cuff Transverse Force Couple and Its Association With Glenohumeral Joint Stability in Individuals With Symptomatic Supraspinatus Tears / $c Jingxuan Wang.
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500 $a Source: Masters Abstracts International, Volume: 86-10.
500 $a Advisors: Debski, Richard E.; Murray, Mary E. Committee members: Irrgang, James J.
502 $b M.S. $c University of Pittsburgh $d 2025.
520 $a The rotator cuff muscles play a crucial role in maintaining glenohumeral joint stability. They form a force couple in the transverse plane, with the subscapularis translating the humeral head anteriorly and medially, while the infraspinatus and teres minor translate the humeral head posteriorly and medially relative to the glenoid. A balanced force couple (i.e., strength ratio: [infraspinatus + teres minor]/subscapularis * 100% ≈ 100%) might minimize glenohumeral glide/translation during shoulder motion and improve joint stability, potentially informing the design of exercise therapy for managing supraspinatus tears.Therefore, the purpose of this study was to investigate the relationship between the strength ratio of the rotator cuff transverse force couple and glenohumeral arthrokinematics/kinematics during scapular plane abduction in individuals with symptomatic rotator cuff tears isolated to the supraspinatus tendon. It was hypothesized that a non-linear relationship would exist between the strength ratio and the range of glenohumeral anterior-posterior glide/translation, with a strength ratio of approximately 100% being associated with minimized anterior-posterior glide/translation.Forty-nine subjects with symptomatic supraspinatus tears (25 males, 24 females; age: 60 ± 8 years) were included in the study. Isometric rotator cuff strength was assessed by a physical therapist using a hand-held dynamometer. In vivo glenohumeral arthrokinematics/kinematics during scapular plane abduction were assessed using bi-plane radiography and a validated model-based tracking technique. Polynomial regressions were utilized to determine the associations between the strength ratio and glenohumeral arthrokinematics/kinematics. Significance was set at p < 0.05.The results indicated no relationship between the strength ratio and glenohumeral arthrokinematics/kinematics during scapular plane abduction in individuals with symptomatic supraspinatus tears. This was consistent before and after exercise therapy, regardless of tear type (partial- or full-thickness) or sex. A possible explanation for this lack of association is that this population retains an intact transverse force couple, functional deltoid and surrounding shoulder musculature, and intact static stabilizers. These structures likely maintain central compression of the humeral head within the glenoid, thereby diminishing the impact of the transverse force couple strength ratio on glenohumeral arthrokinematics/kinematics. These findings highlight the importance of enhancing overall shoulder strength and function, which should be a primary goal of exercise therapy.
546 $a English
590 $a School code: 0178
650 4 $a Bioengineering. $3 657580
650 4 $a Physical therapy. $3 588713
650 4 $a Biomechanics. $3 548685
650 4 $a Kinesiology. $3 517627
653 $a Rotator cuff
653 $a Glenohumeral joint
653 $a Rotator cuff tears
653 $a Exercise therapy
690 $a 0202
690 $a 0575
690 $a 0382
690 $a 0648
710 2 $a University of Pittsburgh. $b Sports Medicine and Nutrition. $e degree granting institution. $3 3826592
720 1 $a Debski, Richard E. $e degree supervisor.
720 1 $a Murray, Mary E. $e degree supervisor.
773 0 $t Masters Abstracts International $g 86-10.
790 $a 0178
791 $a M.S.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31934681