scholarly journals The comparison of the shoulder muscle activation in patients with rotator cuff tear under an abduction brace among the three postures

2021 ◽  
pp. 14
Author(s):  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Supine Position ◽  
Repeated Measures ◽  
Muscle Activation ◽  
Biceps Brachii ◽  
Sitting Position ◽  
Cuff Tear ◽  
Upper Trapezius ◽  
Anterior Deltoid

Background: Immobilization using an abduction brace is essential for the relaxation of the rotator cuff and scapular muscles and the prevention of a retear in patients with rotator cuff tear after arthroscopic rotator cuff repair (ARCR). However, thus far, the comparison of the scapular muscle activities has not been compared among different postures under an abduction brace in patients after ARCR. Objectives: The purpose of our study was to compare the scapular muscle activities among the supine position, sitting position, and walking under an abduction brace before and after ARCR Study Design: Observational, repeated measures study. Methods: Twelve patients with full-thickness rotator cuff tears were studied. The mean patient age was 64.7 years. The scapular muscle activations of the ipsilateral limbs were measured using surface electromyography in three postures: supine position, sitting position, and walking. The integrated electromyography relative values of the upper trapezius, anterior deltoid, middle deltoid, and biceps brachii were compared preoperatively and at two weeks after ARCR. Results: The trapezius, biceps brachii, and middle deltoid in the walking showed significantly higher integrated electromyography relative values than those in the supine position, preoperatively and at two weeks after surgery. The anterior deltoid in the sitting position had significantly higher integrated electromyography relative values than those in the supine position. Conclusions: Postures affected the scapular muscle activities in ARCR patients under an abduction brace. Understanding the influence of posture on the scapular muscle activity after ARCR will help rehabilitation accurately and appropriately.

Shoulder muscle activation and coordination in patients with a massive rotator cuff tear: An electromyographic study

2011 ◽  
Vol 30 (7) ◽  
pp. 1140-1146 ◽  
Author(s):  
David H. Hawkes ◽  
Omid Alizadehkhaiyat ◽  
Graham J. Kemp ◽  
Anthony C. Fisher ◽  
Margaret M. Roebuck ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Muscle Activation ◽  
Massive Rotator Cuff Tear ◽  
Cuff Tear ◽  
Shoulder Muscle

Headstand for Rotator Cuff Tear: Shîrshâsana or Surgery

2006 ◽  
Vol 16 (1) ◽  
pp. 39-47
Author(s):  
Loren Fishman ◽  
Caroline Konnoth ◽  
Alena Polesin
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Repeated Measures ◽  
Shoulder Abduction ◽  
Inverted Position ◽  
Clinical Criteria ◽  
Repeated Measures Design ◽  
Cuff Tear ◽  
Before And After

Objective: Pilot study to demonstrate and explain the enabling effects of headstand and chair-supported headstand in the clinical management of patients with rotator cuff tear, also known as rotator cuff syndrome (RCS). Design: Prospective, unblinded single exposure study with repeated-measures design. Setting: Private outpatient medical office. Participants: Ten patients meeting clinical criteria for rotator cuff syndrome (RCS). MRI confirmed severe or total thickness tear of either the supraspinatus or infraspinatus muscles or both. Intervention: Participants were taught a version of shîrshâsana (headstand), and remained in the inverted position for 30 seconds. Participants practiced the inversion for 30 seconds once a day for six weeks thereafter. Data: Patients were tested for maximal voluntary abduction and flexion of the neutrally positioned arm, then rated their pain on maximal abduction before and after being taught a version of headstand, and at a six-week follow-up. Outcome Measures: Immediate (post-headstand) and six-week change in function, measured by active range of abduction and flexion of the neutrally positioned arm. Immediate (post-headstand) and six-week change in pain during abduction, measured by a 10-point visual analogue scale (VAS). Results: Mean voluntary abduction and flexion increased from 85 degrees each to 158 degrees and 162 degrees respectively. Mean VAS pain rating during abduction fell from 4.8/10 to 1.2/10. Further Investigation: Electromyographic (EMG) interference pattern changes showed that the subscapularis, anterior and lateral deltoid, and rhomboid major were significantly more active electrophysiologically during headstand, and in abduction and flexion following headstand, than in abduction and flexion performed prior to headstand. MRI confirmed subscapularis activation in post-headstand shoulder abduction. Conclusions: Headstand and a chair-supported version of headstand appear to improve function in the upper extremity after rotator cuff injury. EMG suggests that the subscapularis holds down the head of the humerus while the deltoid abducts the shaft. Using these two muscles together for abduction and flexion, in place of the supraspinatus, appears to be learned through brief exposure to a version of headstand.

scholarly journals Delayed Anticipatory Muscle Activation in Rotator Cuff Tendinopathy

2021 ◽  
Vol 9 (7) ◽  
pp. 232596712110193
Author(s):  
Samuel Baek ◽  
Se-Young Ki ◽  
Seok Won Chung ◽  
Seoung-Joon Lee ◽  
Young Chang Cho ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Muscle Activation ◽  
Onset Time ◽  
Unaffected Side ◽  
Number Count ◽  
Upper Trapezius ◽  
Affected Side ◽  
Shoulder Muscles ◽  
The Central Nervous System ◽  
Anterior Deltoid

Background: Previous research investigating rotator cuff (RC) tendinopathy has usually focused on pathoanatomy. The pathologic response to anticipatory postural adjustments (APAs) has not yet been investigated. Purpose/Hypothesis: To explore changes in APAs as detected by pre-emptive activation of shoulder muscles during ball catching. It was hypothesized that anticipatory muscle activation (AMA) would be present in the unaffected shoulder but delayed or absent in the affected shoulder in patients with RC tendinopathy. Study Design: Controlled laboratory study. Methods: This study included 21 RC tendinopathy patients with a mean age of 49.5 years. Patients were required to grab a ball embedded with an electromyography sensor when it dropped on their hand, and surface electromyography signals were recorded from the infraspinatus, upper trapezius, anterior deltoid, and biceps. The trials utilized 2 balls, weighing 200 g and 500 g. Each ball was used in 2 trials, 1 involving a number count preceding the ball drop (predictable) and the other involving a sudden drop (unpredictable). The onsets of AMA between the affected and unaffected limbs were compared. Results: Regardless of the experimental condition, significantly delayed AMA onsets were identified in all investigated muscles of the affected side compared with those of the unaffected side, except for the biceps muscle in the 500-g predictable trial. For the infraspinatus, the mean onset time in the 200-g predictable trial was –141.0 ± 60.2 ms on the affected side and –211.9 ± 67.1 ms on the unaffected side ( P < .001); in the 200-g unpredictable trial this value was –139.5 ± 54.9 ms on the affected side and –199.5 ± 56.2 ms on the unaffected side ( P < .001). Conclusion: Delayed AMA was observed in the affected shoulder compared with the unaffected shoulder in patients with RC tendinopathy, not only in the RC muscle but also in the periscapular and upper arm muscles. This may indicate that central hypoexcitability is partly responsible. Clinical Relevance: The basis for RC tendinopathy treatment should not be limited to the tendon pathoanatomy. Delayed AMA around the shoulder joint could provide insight into potential mechanisms related to the central nervous system.

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.

Biceps Detachment Preserves Joint Function in a Chronic Massive Rotator Cuff Tear Rat Model: Response

2019 ◽  
Vol 47 (5) ◽  
pp. NP34-NP35
Author(s):  
Mengcun Chen ◽  
Snehal S. Shetye ◽  
Julianne Huegel ◽  
Corinne N. Riggin ◽  
Daniel J. Gittings ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Rat Model ◽  
Joint Function ◽  
Massive Rotator Cuff Tear ◽  
Cuff Tear ◽  
Model Response

scholarly journals Factors Associated With Lateral Epicondylitis of the Elbow

2021 ◽  
Vol 9 (5) ◽  
pp. 232596712110077
Author(s):  
Hyung Bin Park ◽  
Ji-Yong Gwark ◽  
Jin-Hyung Im ◽  
Jae-Boem Na
Keyword(s):  
Risk Factors ◽  
Regression Analysis ◽  
Rotator Cuff ◽  
Rotator Cuff Tear ◽  
Lateral Epicondylitis ◽  
Multivariable Logistic Regression Analysis ◽  
Manual Labor ◽  
Metabolic Factors ◽  
Cuff Tear ◽  
Dominant Side

Background: Metabolic factors have been linked to tendinopathies, yet few studies have investigated the association between metabolic factors and lateral epicondylitis. Purpose: To evaluate risk factors for lateral epicondylitis, including several metabolic factors. Study Design: Case-control study; Level of evidence, 3. Methods: We evaluated 1 elbow in each of 937 volunteers from a rural region that employs many agricultural laborers. Each participant received a questionnaire, physical examinations, blood tests, simple radiographic evaluations of both elbows, magnetic resonance imaging of bilateral shoulders, and an electrophysiological study of bilateral upper extremities. Lateral epicondylitis was diagnosed using 3 criteria: (1) pain at the lateral aspect of the elbow, (2) point tenderness over the lateral epicondyle, and (3) pain during resistive wrist dorsiflexion with the elbow in full extension. Multivariable logistic regression analysis was used to calculate the odds ratios (ORs) and 95% CIs for various demographic, physical, and social factors, including age, sex, waist circumference, dominant-side involvement, smoking habit, alcohol intake, and participation in manual labor; the comorbidities of diabetes, hypertension, thyroid dysfunction, metabolic syndrome, ipsilateral biceps tendon injury, ipsilateral rotator cuff tear, and ipsilateral carpal tunnel syndrome; and the serologic parameters of serum lipid profile, glycosylated hemoglobin A1c, level of thyroid hormone, and high-sensitivity C-reactive protein. Results: The prevalence of lateral epicondylitis was 26.1% (245/937 participants). According to the multivariable logistic regression analysis, female sex (OR, 2.47; 95% CI, 1.78-3.43), dominant-side involvement (OR, 3.21; 95% CI, 2.24-4.60), manual labor (OR, 2.25; 95% CI, 1.48-3.43), and ipsilateral rotator cuff tear (OR, 2.77; 95% CI, 1.96-3.91) were significantly associated with lateral epicondylitis ( P < .001 for all). No metabolic factors were significantly associated with lateral epicondylitis. Conclusion: Female sex, dominant-side involvement, manual labor, and ipsilateral rotator cuff tear were found to be risk factors for lateral epicondylitis. The study results suggest that overuse activity is more strongly associated with lateral epicondylitis than are metabolic factors.

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