Electromyographic analysis of the deltoid and rotator cuff muscles in persons with subacromial impingement

Reddy, Ashok S.; Mohr, Karen; Pink, Marilyn; Jobe, Frank W.

doi:10.1067/mse.2000.109410

Cited by 186 publications

(168 citation statements)

References 11 publications

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“…This load was chosen to control for the different strengths and lengths of lever arms among subjects and has been reported to simulate the load used during rehabilitation of patients with shoulder pathology. 29 The mean (±SD) load held during scapular assessment for all subjects was 9.1 ± 2.2 N.…”

Section: Methodsmentioning

confidence: 95%

“…29 Furthermore, previous studies 16,23 have shown that alterations in scapular kinematics may be increased during a more physically demanding task, such as holding a load during humeral elevation. A Biodex System 3 isokinetic dynamometer (Biodex Medical, Shirley, NY) was used in the current study prior to kinematic assessment to determine the load that each subject would hold during the kinematic trials.…”

Section: Instrumentationmentioning

confidence: 97%

“…A Biodex System 3 isokinetic dynamometer (Biodex Medical, Shirley, NY) was used in the current study prior to kinematic assessment to determine the load that each subject would hold during the kinematic trials. 29 The Biodex system utilizes a dynamometer containing strain gauges and potentiometers to measure torque output from most any joint. In the current study, isometric torque for shoulder elevation was quantified.…”

Section: Instrumentationmentioning

confidence: 99%

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Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Laudner

Myers

Pasquale

et al. 2006

J Orthop Sports Phys Ther

195

153

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Study Design: Case control group study. Objectives: To compare scapular position and orientation between baseball players with and without pathologic internal impingement. Background: Scapular dysfunction has been implicated as a contributor to throwing-related pathologic internal impingement of the shoulder due to its role in increasing the contact between the greater tuberosity and posterior-superior glenoid, thereby impinging the posterior rotator cuff tendon(s) and labrum. However, to date, no definitive data demonstrate this scapular dysfunction in throwing athletes. The purpose of this study was to assess, in a controlled laboratory environment, whether scapular position and orientation would be different in throwing athletes diagnosed with pathologic internal impingement than in a control group of throwing athletes. Methods and Measures: Eleven throwing athletes diagnosed with pathologic internal impingement, using both clinical examination and a magnetic resonance arthrogram, were demographically matched with a control group of 11 throwers with no history of upper extremity injury. An electromagnetic tracking device was used to measure scapular internal/external rotation, anterior/ posterior tilt, upward/downward rotation, sternoclavicular protraction/retraction, and elevation/ depression during humeral elevation within the scapular plane. Comparisons were made between groups with analysis of variance models (PϽ.05). Results:The individuals in the pathologic internal impingement group demonstrated statistically significant increased sternoclavicular elevation when elevating their humerus from 30°to 120°( P = .002) and from 60°to 120°(P = .003), compared to the control group. Furthermore, these patients also had increased posterior scapular tilt position (P = .016). No statistically significant differences were present in any other scapular variables measured. Conclusions: Based on the results of this study, throwing athletes diagnosed with pathologic internal impingement present with statistically significant increases in sternoclavicular elevation and scapular posterior tilt position during humeral elevation in the scapular plane.

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Section: Methodsmentioning

confidence: 95%

Section: Instrumentationmentioning

confidence: 97%

Section: Instrumentationmentioning

confidence: 99%

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Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Laudner

Myers

Pasquale

et al. 2006

J Orthop Sports Phys Ther

195

153

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“…Individuals with shoulder impingement syndrome were found to have decreased muscle activity in infraspinatus and middle deltoid during scaption compared to controls (Reddy et al , 2000), while patients with symptomatic rotator cuff tear were found to have decreased activity for the deltoid muscle (Shinozaki, Sano, 2014). One of the goals of physiotherapy is to restore optimal muscle recruitment patterns about the shoulder joint (Sahrmann, 2002).…”

Section: Introductionmentioning

confidence: 99%

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

et al. 2016

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“…Internal and external rotation are consistently used to assess the rotator cuff, (Ludewig & Cook, 2000;Reddy, Mohr, Pink, & Jobe, 2000) with bilateral comparison of concentric peak torque shown to be the most appropriate outcome parameter for comparisons between healthy subjects and those with a painful condition (van Meeteren, Roebroeck, Selles, Stijnen, & Stem, 2004). A seated testing position with the shoulder positioned in the scapular plane is reported to optimize the length tension relationship of the rotators, maximizing conformity between the humeral head and glenoid and is the most comfortable testing position (Kuhlman et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Isokinetic clinical assessment of rotator cuff strength in subacromial shoulder impingement

Land

Gordon

Watt

2017

Musculoskeletal Science and Practice

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Background: Current conservative management of subacromial shoulder impingement (SSI) includes generic strengthening exercises, especially for internal (IR) and external (ER) shoulder rotators. However, there is no evidence that the strength or the ratio of strength between these muscle groups is different between those with SSI (cases) and an asymptomatic population (controls).Objective: To identify if isokinetic rotator cuff strength or the ratio of strength is significantly different between cases and controls.Study Design: Case Control Study.Method: Fifty one cases with SSI and 51 asymptomatic controls matched for age, gender, hand dominance and physical activity level completed isokinetic peak torque glenohumeral IR and ER testing. Within the SSI group, 31 dominant limbs were symptomatic and 20 non-dominant limbs were symptomatic. IR and ER were measured separately using continuous reciprocal concentric (con) and eccentric (ecc) contraction cycles at a speed of 60 0 degrees per second and again at 120 0 degrees per second. Values of peak torque (PT), relative peak torque (RPT) and ratios were compared using independent t-tests between the SSI and asymptomatic groups.Results: Significant strength differences between the two groups were present only when the symptomatic SSI shoulder was the dominant shoulder (con ER PT at 60 0 /second, ecc ER PT at 120 0 /second, ecc ER RPT at 120 0 /second and ecc IR PT at 60 0 /second and 120 0 /second). Conclusions:Changes in rotator cuff strength in SSI may be related to limb dominance, which may have implications for strengthening regimes. Level of Evidence:Level 3a

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Electromyographic analysis of the deltoid and rotator cuff muscles in persons with subacromial impingement

Cited by 186 publications

References 11 publications

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

Scapular Dysfunction in Throwers with Pathologic Internal Impingement

The initial effects of a sustained glenohumeral postero-lateral glide during elevation on shoulder muscle activity: A repeated measures study on asymptomatic shoulders

Isokinetic clinical assessment of rotator cuff strength in subacromial shoulder impingement

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