The relative strengths of the rotator cuff muscles. A cadaver study

Keating, JF; Waterworth, P.; Shaw-Dunn, John; Crossan, J. F.

doi:10.1302/0301-620x.75b1.8421011

Cited by 174 publications

(96 citation statements)

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“…Several studies have pointed out that some muscles-for instance, the deltoid muscle (Michiels and Bodem 1992), the trapezius muscle (Inman et al 1944, Jensen 1995, and the subscapularis muscle (Kadaba et al 1992)-should be regarded not as single muscles but rather as functional units which work on their own to a large extent. Recent studies have shown a complex interaction between the shoulder muscles in shoulder joint movements (Pearl et al 1992, Keating et al 1993. Not only the supraspinatus muscle but also the rest of the rotator cuff muscles contribute significantly to abduction (Sharkey et al 1994).…”

Section: Discussionmentioning

confidence: 99%

Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Sporrong¹,

Palmerud

Herberts

1996

Acta Orthopaedica Scandinavica

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Section: Discussionmentioning

confidence: 99%

Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Sporrong¹,

Palmerud

Herberts

1996

Acta Orthopaedica Scandinavica

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“…Given the importance of the subscapularis tendon in shoulder function, which has been exemplified in several studies, 10,[18][19][20] the need to properly recognize and treat subscapularis tendon tears cannot be underscored. The subscapularis, being the largest and most powerful of the rotator cuff muscles, alone provides approximately 50% of the rotator cuff force, 21) and is important for arm elevation. 20) Intriguingly, the subscapularis muscle has been shown to be more active in patients with asymptomatic cuff tears implying that the subscapularis tendon may play a compensatory role during posterosuperior cuff tears.…”

Section: Discussionmentioning

confidence: 99%

Clinical and Structural Outcomes of Arthroscopic Intraarticular Knotless Fixation for Upper Subscapularis Tendon Tears: A Preliminary Report

Cho

Shim²,

Nam

et al. 2016

Clinics in Shoulder and Elbow

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Background: A novel technique for the repair of tears of the upper subscapularis tendon-intraarticular knotless fixation-has been introduced recently. The purpose of this study was to evaluate the clinical and structural outcomes of arthroscopic intraarticular knotless fixation for the treatment of upper subscapularis tendon tears. Methods: We retrospectively analyzed the clinical and radiological outcomes of 27 patients who underwent arthroscopic intraarticular knotless fixation for upper subscapularis tendon tears. Finally, a total of 10 patients who could participate in at least a 6 month follow-up of magnetic resonance imaging evaluation and in a least 1-year follow-up on an outpatient basis were enrolled in our study. The mean age at the time of operation was 60.7 years, and the mean duration of follow-up was 14.7 months. Two patients had concomitant tears of the supraspinatus tendon and 8 patients had concomitant tears of the supraspinatus and the infraspinatus tendons. Results: The clinical and radiological outcomes improved after the patients had undertaken arthroscopic intraarticular knotless fixation. The mean visual analogue scale score for pain during motion improved from 6.7 preoperatively to 1.4 at the final follow-up (p<0.001). The mean Constant score improved from 59.3 preoperatively to 79.6 at the final follow-up, and the mean the University of California at Los Angeles score, from 21.7 to 30.2, respectively (p<0.001 and p<0.001). The upper subscapularis tendon tear was healed in every patient except one (90%), for the patient had suffered from a postoperative trauma that resulted in a retear. Conclusions: We found that arthroscopic intraarticular knotless fixation gives good clinical and structural outcomes for the repair of upper subscapularis tendon tears. Arthroscopic intraarticular knotless fixation provided such a reliable and efficient restoration of the subscapularis tendon footprint that we anticipate it will become a widely-used procedure for upper subscapularis tendon tears. (Clin Shoulder Elbow 2016;19(3):130-136)

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“…견갑하근 (subscapularis muscle)은 회전근 개 (rotator cuff) 중 가장 크고 강력한 근육으로, 1) 견관 절의 내회전, 외전 기능 및 수동적, 능동적 안정화 구 조물로 작용한다. [2][3][4][5][6][7][8][9] 또한 회전근 개의 주요 근육들 중 하나로서, 'force couple' 의 개념으로 견관절이 정상적 이며 조절된 운동을 하는데 중요한 기능을 하고 있다.…”

Section: 서 론unclassified

MR Evaluation of Tendinous Portions in the Subscapularis Muscle

Shon

Koh

Lee³

et al. 2011

The Journal of the Korean Shoulder and Elbow Society

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Purpose: The purpose of this study was to document the structural features of the tendinous portions within the non-pathologic subscapularis muscle by performing high resolution MR imaging of the shoulder. Materials and Methods: Between April 2007 and May 2010, we retrospectively obtained the MR scans of 88 consecutive young patients (88 shoulders) who were in their twenties. MRI and MR arthrography were performed using a 3.0-T system for the evaluation of glenohumeral instability and nonspecific shoulder pain. None of the patient in this study had any evidence of injury to the tendon or muscle belly of the subscapularis. On MR images, we recorded the transverse length of a stout tendinous band and the total tendinous portion of the subscapularis. In addition, we recorded the number of intramuscular tendinous slips of the susbscapularis. Results: The mean transverse length of the tendinous band was 15.0 mm (range: 8 to 20 mm). The mean transverse length of the total tendinous portion was 48.9 mm (range: 40 to 60 mm). The number of intramuscular tendinous slips on the base of the glenoid fossa was 3 in 20 (22.72%), 4 in 45 (51.14%) and 5 in 23 shoulders (26.14%). On the lateral portion, the intramuscular tendinous slips became gradually rounder and thicker and they gave converge in the superior direction. Conclusion: In this study, the structural features of the tendinous portions of the subscapularis on the MR scans were identified. This will in return give good justification for the lines to be pulled during biomechanical stimulation and also for the surgical approach to restore the biomechanical function.

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The relative strengths of the rotator cuff muscles. A cadaver study

Cited by 174 publications

References 0 publications

Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Hand grip increases shoulder muscle activity: An EMG analysis with static handcontractions in 9 subjects

Clinical and Structural Outcomes of Arthroscopic Intraarticular Knotless Fixation for Upper Subscapularis Tendon Tears: A Preliminary Report

MR Evaluation of Tendinous Portions in the Subscapularis Muscle

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