scholarly journals A musculoskeletal model-based estimation of shoulder muscle forces during the abduction of the upper arm in case of rotator cuff tears.

2014 ◽  
Vol 38 (2) ◽  
pp. 143-149
Author(s):  
Naoki KINOSHITA ◽  
Toyohiko HAYASHI ◽  
Hiroshi TANAKA ◽  
Hiroki NINOMIYA ◽  
Masahiko KOMAI ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Musculoskeletal Model ◽  
Rotator Cuff Tears ◽  
Muscle Forces ◽  
Upper Arm ◽  
Model Based ◽  
Shoulder Muscle

Muscle Activity Before and After Subacromial Injection

2021 ◽  
pp. 1-7
Author(s):  
Lucas Ettinger ◽  
Matthew Shaprio ◽  
Andrew Karduna
Keyword(s):  
Rotator Cuff ◽  
Muscle Activation ◽  
Rotator Cuff Tears ◽  
Subacromial Impingement ◽  
Upper Trapezius ◽  
Subacromial Injection ◽  
Shoulder Muscle ◽  
Shoulder Muscles ◽  
Before And After ◽  
Arm Elevation

Context: Shoulder muscle activation in patients with subacromial impingement is highly cited and variable in the literature. Differences between studies could be due to artifacts introduced by normalization practices in the presence of pain. Ultimately, this lack of knowledge pertaining to pathogenesis limits the clinical treatment and restoration of muscular function. Design: A total of 21 patients with stage 2 subacromial impingement and 21 matched controls were recruited for EMG testing of their affected shoulder during an arm elevation task. The patients were tested before and after receiving an injection to their subacromial bursa. Methods: The EMG from 7 shoulder muscles were measured before and after treatment during humeral motion in the scapular plane. Results: Our findings indicate an increase in anterior deltoid, middle deltoid, and upper trapezius activity following the injection; further, this trend extended to the controls. The control subjects had a greater activation of the latissimus dorsi at peak arm elevation when compared with the patient group postinjection. Conclusions: Our results indicate that a reduction in subacromial pain is associated with changes in shoulder muscle recruitment, primarily of the deltoid. This change in deltoid activity may lend evidence to rotator cuff function in patients without rotator cuff tears.

scholarly journals Shoulder muscle forces during driving: Sudden steering can load the rotator cuff beyond its repair limit

2015 ◽  
Vol 30 (8) ◽  
pp. 839-846 ◽  
Author(s):  
Petros Pandis ◽  
Joe A.I. Prinold ◽  
Anthony M.J. Bull
Keyword(s):  
Rotator Cuff ◽  
Muscle Forces ◽  
Shoulder Muscle

Effect of rotator cuff tears on joint reaction force and muscle force: musculoskeletal model simulation

Physiotherapy ◽  
2015 ◽  
Vol 101 ◽  
pp. e764
Author(s):  
R. Kiyama ◽  
H. Kakoi ◽  
T. Nojima ◽  
I. Kisanuki ◽  
T. Yamano ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Muscle Force ◽  
Model Simulation ◽  
Reaction Force ◽  
Musculoskeletal Model ◽  
Rotator Cuff Tears ◽  
Joint Reaction Force ◽  
Joint Reaction

scholarly journals Modeling a rotator cuff tear: Individualized shoulder muscle forces influence glenohumeral joint contact force predictions

2018 ◽  
Vol 60 ◽  
pp. 20-29 ◽  
Author(s):  
Meghan E. Vidt ◽  
Anthony C. Santago ◽  
Anthony P. Marsh ◽  
Eric J. Hegedus ◽  
Christopher J. Tuohy ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Contact Force ◽  
Glenohumeral Joint ◽  
Muscle Forces ◽  
Cuff Tear ◽  
Joint Contact Force ◽  
Shoulder Muscle ◽  
Joint Contact

scholarly journals Effect of Rotator Cuff Deficiencies on Muscle Forces and Glenohumeral Contact Force After Anatomic Total Shoulder Arthroplasty Using Musculoskeletal Multibody Dynamics Simulation

2021 ◽  
Vol 9 ◽  
Author(s):  
Zhenxian Chen ◽  
Xunjian Fan ◽  
Yongchang Gao ◽  
Jing Zhang ◽  
Lei Guo ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Multibody Dynamics ◽  
Shoulder Arthroplasty ◽  
Total Shoulder Arthroplasty ◽  
Deltoid Muscle ◽  
Contact Forces ◽  
Dynamics Simulation ◽  
Rotator Cuff Tears ◽  
Muscle Forces

Anatomic total shoulder arthroplasty (ATSA) is widely used to treat the diseases of the glenohumeral (GH) joint. However, the incidence of rotator cuff tears after ATSA increases during follow-up. The effects of rotator cuff deficiencies after ATSA on the biomechanics of the GH joint are to be investigated. In this study, a musculoskeletal multibody dynamics model of ATSA was established using a force-dependent kinematics (FDK) method. The biomechanical effects were predicted during arm abduction under different rotator cuff deficiencies. The deltoid forces were increased under the rotator cuff deficiencies, the maximum deltoid forces were increased by 36% under the subscapularis deficiency and by 53% under the supraspinatus, infraspinatus, subscapularis, and teres minor deficiencies. The maximum GH contact forces were decreased by 11.3% under supraspinatus and infraspinatus deficiencies but increased by 24.8% under subscapularis deficiency. The maximum subscapularis force was decreased by 17% under only infraspinatus tear during arm abduction. The results suggested that the changes in the biomechanics of the GH joint induced by rotator cuff deficiencies after ATSA increase the deltoid muscle energy expenditure and joint instability, which result in postoperative less satisfactory clinical outcomes. The changes in rotator cuff muscle forces deserve more attention for understanding the evolution of rotator cuff tear after ATSA.

Accuracy of Rotator Cuff Tears and Tendinosis Diagnoses on Shoulder Ultrasound Performed by a Short-experienced Operator

2018 ◽  
Vol 1 ◽  
pp. 9
Author(s):  
Harshad Arvind Vanjare ◽  
Jyoti Panwar
Keyword(s):  
Rotator Cuff ◽  
Negative Predictive Value ◽  
Rotator Cuff Tear ◽  
Predictive Value ◽  
Rotator Cuff Tears ◽  
Mri Findings ◽  
Cuff Tear ◽  
Experienced Operator ◽  
Magnetic Resonance Imaging Mri ◽  
Sensitivity Specificity

Objective The objective of the study was to assess the accuracy of ultrasound examination for the diagnosis of rotator cuff tear and tendinosis performed by a short experienced operator, compared to magnetic resonance imaging (MRI) results. Method A total of 70 subjects suspected to have rotator cuff tear or tendinosis and planned for shoulder MRI were included in the study. Shoulder ultrasound was performed either before or after the MRI scan on the same day. Ultrasound operator had a short experience in performing an ultrasound of the shoulder. Ultrasound findings were correlated to MRI findings. Results Sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for the diagnosis of tendinosis were 58%, 84%, 63%, 80%, and 75%, respectively, and it was 68%, 91%, 73%, 88%, and 85%, respectively, for the diagnosis of rotator cuff tear. Conclusions Sensitivity for diagnosing rotator cuff tear or tendinosis was moderate but had a higher negative predictive value. Thus, the ultrasound operator with a short experience in performing shoulder ultrasound had moderate sensitivity in diagnosing tendinosis or tears; however, could exclude them with confidence.

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