Electromyographic activities of the biceps during arm elevation in shoulders with rotator cuff tears

Kido, Tadato; Itoi, Eiji; Konno, Naoaki; Sano, Akihisa; Urayama, Masakazu; Satô, Kôzô

doi:10.3109/17453679808999258

Cited by 30 publications

(31 citation statements)

References 17 publications

(13 reference statements)

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“…The long head of the biceps tendon crosses the shoulder and may serve as an important joint stabilizer, particularly in the presence of cuff tears; however, its role in joint stability remains controversial. Specifically, some believe that it provides minimal stability at the shoulder [11,27], while others believe it serves mainly as a humeral head depressor, assisting the supraspinatus [7,8].…”

Section: Introductionmentioning

confidence: 99%

Biceps Detachment Decreases Joint Damage in a Rotator Cuff Tear Rat Model

Thomas

Reuther

Tucker

et al. 2014

Clinical Orthopaedics &Amp; Related Research

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Background Pathology in the long head of the biceps tendon often occurs in patients with rotator cuff tears. Arthroscopic tenotomy is the most common treatment. However, the role of the long head of the biceps at the shoulder and the consequences of surgical detachment on the remaining shoulder structures remain unknown. Questions/purposes We hypothesized that detachment of the long head of the biceps, in the presence of supraspinatus and infraspinatus tears, would decrease shoulder function and decrease mechanical and histologic properties of both the subscapularis tendon and the glenoid articular cartilage. Methods We detached the supraspinatus and infraspinatus or the supraspinatus, infraspinatus, and long head of the biceps after 4 weeks of overuse in a rat model. Animals were gradually returned to overuse activity after detachment. At 8 weeks, the subscapularis and glenoid cartilage biomechanical and histologic properties were evaluated and compared. Results The group with the supraspinatus, infraspinatus, and long head of the biceps detached had greater medial force and decreased change in propulsion, braking, and vertical force. This group also had an increased upper and lower subscapularis modulus but without any differences in glenoid cartilage modulus. Finally, this group had a significantly lower cell density in both the upper and lower subscapularis tendons, although cartilage histology was not different. Conclusions Detachment of the long head of the biceps tendon in the presence of a posterior-superior cuff tear resulted in improved shoulder function and less joint damage in this animal model. Clinical Relevance This study provides evidence in an animal model that supports the use of tenotomy for the management of long head of the biceps pathology in the presence of a two-tendon cuff tear. However, long-term clinical trials are required.

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Section: Introductionmentioning

confidence: 99%

Biceps Detachment Decreases Joint Damage in a Rotator Cuff Tear Rat Model

Thomas

Reuther

Tucker

et al. 2014

Clinical Orthopaedics &Amp; Related Research

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“…Surprisingly, we could only identify a few articles that measured EMG in patients with rotator cuff tears (Kido et al, 1998;Fokter et al, 2003;Hoellrich et al, 2005;Kelly et al, 2005), with no studies comparing deltoid activation to healthy controls.…”

Section: Discussionmentioning

confidence: 99%

Suprascapular nerve block results in a compensatory increase in deltoid muscle activity

McCully

Suprak

Kosek³

et al. 2007

Journal of Biomechanics

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“…An EMG study by Kido et al (1998) demonstrated that only onethird of patients with rotator cuff tears showed increased activity of the biceps during arm elevation compared to that in subjects without rotator cuff tears. On the other hand, Yamaguchi et al (1997) reported that there was no significant activity of the biceps observed during arm elevation in patients with rotator cuff tears.…”

Section: Discussionmentioning

confidence: 99%

Cross-sectional area of the tendon and the muscle of the biceps brachii in shoulders with rotator cuff tears

et al. 2005

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Background The intraarticular portion of the long head of the biceps tendon is often widened in shoulders with cuff tears. It is unclear whether this is a local phenomen or is caused by muscle hypertrophy.Methods We investigated morphological changes of the biceps brachii in 14 embalmed shoulders: 7 with intact rotator cuff and 7 with rotator cuff tears.We measured the cross-sectional area (CSA) of the tendon of the long head of the biceps (LHB) at 9 levels between the glenoid origin and the musculotendinous junction. The muscle volume and the muscle fiber length of the long and short heads of the biceps were measured to calculate the physiological CSA (PCSA) by dividing the volume by the fiber length.Results The CSA of the LHB tendon at the entrance to the bicipital groove was greater in cuff tear shoulders than in normal shoulders. The PCSA of the biceps was similar in normal and cuff tear shoulders.Interpretation Hypertrophy of the LHB tendon appears to be a localized morphological change near the entrance to the bicipital groove.

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Electromyographic activities of the biceps during arm elevation in shoulders with rotator cuff tears

Cited by 30 publications

References 17 publications

Biceps Detachment Decreases Joint Damage in a Rotator Cuff Tear Rat Model

Biceps Detachment Decreases Joint Damage in a Rotator Cuff Tear Rat Model

Suprascapular nerve block results in a compensatory increase in deltoid muscle activity

Cross-sectional area of the tendon and the muscle of the biceps brachii in shoulders with rotator cuff tears

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