Sarcomere length of torn rotator cuff muscle

Tomioka, Tatsuru; Minagawa, Hiroshi; Kijima, Hiroshi; Yamamoto, Nobuyuki; Abe, Hidekazu; Maesani, Matthieu; Kikuchi, Kazuma; Abé, Hiroshi; Shimada, Yasuhiro; Itoi, Eiji

doi:10.1016/j.jse.2009.03.009

Cited by 31 publications

(36 citation statements)

References 23 publications

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“…This finding may be related to the fact that sarcomere lengths were only slightly reduced three days after the tenotomy, indicating that muscle retraction, although present, was mild. These findings agree with previous observations of only small decreases in muscle dimensions following single-muscle (supraspinatus) tenotomies in the rats 17 and with observations in human cadaver shoulders with rotator cuff tears 9 . Taken together, these changes suggest severe impairment of muscle force production and more minor impairment of muscle excursion and velocity.…”

Section: Discussionsupporting

confidence: 93%

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Architectural and Biochemical Adaptations in Skeletal Muscle and Bone Following Rotator Cuff Injury in a Rat Model

Sato

Killian

Choi

et al. 2015

The Journal of Bone and Joint Surgery

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Section: Discussionsupporting

confidence: 93%

“…Likewise, decreased muscle weight, volume, and/or fiber length have been observed in both animal models and human cadavers with rotator cuff injuries 8,9 . Previous work with a sheep model demonstrated a correlation between active force production and muscle atrophy following rotator cuff injury 7 .…”

mentioning

confidence: 93%

Architectural and Biochemical Adaptations in Skeletal Muscle and Bone Following Rotator Cuff Injury in a Rat Model

Sato

Killian

Choi

et al. 2015

The Journal of Bone and Joint Surgery

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“…From previous studies, it has been shown that the muscle fiber length of an intact supraspinatus muscle is approximately 57 6 0.1 mm and accordingly less (33 6 6.5 mm) in a retracted supraspinatus. 19 Therefore, this implies that to reattach the torn tendon to its anatomic insertion site, the necessary muscle fiber lengthening is approximately 100%, which is physiologically not possible without disruption and subsequent scarring of the muscle fibers.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Analysis of Muscle and Tendon Retraction in Chronic Rotator Cuff Tears

et al. 2011

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BACKGROUND: Musculotendinous retraction is a limiting factor for repair of long-standing rotator cuff tears. However, it is currently unknown to what extent the muscle and tendon contribute to the degree of total retraction. Further understanding of this may possibly influence the strategy of musculotendinous reconstruction. PURPOSE: To analyze the contribution of muscle and tendon to the process of myotendinous retraction. STUDY DESIGN: Cross-sectional study; Level of evidence, 3. METHODS: Magnetic resonance imaging of 130 shoulders with intact (n = 20) or completely torn supraspinatus tendons was analyzed. Fatty infiltration of the supraspinatus muscle was graded according to Goutallier stages. The degree of retraction of the tendon stump and of the musculotendinous junction was assessed. RESULTS: There were 30 shoulders without evidence of supraspinatus fatty infiltration, 25 with stage 1, 23 with stage 2, 25 with stage 3, and 15 with stage 4 changes. The corresponding tear sizes (distance of tendon end from greater tuberosity) were 4, 21, 27, 37, and 41 mm; the distance of the myotendinous junction from the greater tuberosity was 22, 33, 39, 48, and 48 mm; and the length of the tendons (distance of tendon end to myotendinous junction) was 19, 13, 12, 11, and 8 mm, respectively. In Goutallier stage 3 and above, and in case of a positive tangent sign, the musculotendinous junction was, in 90% of the cases, retracted to or beyond the glenoid. CONCLUSION: Musculotendinous retraction in chronic rotator cuff tears results mainly from shortening of the muscle fibers but in advanced stages results also from shortening of the tendon tissue itself. The present data demonstrate, for the first time, that the residual tendon stump in a tendon tear does not have the length of the original tendon and is further shortened over time. Therefore, direct anatomic tendon reinsertion will result in lengthening of the supraspinatus muscle greater than what it would have been before the tear. Background: Musculotendinous retraction is a limiting factor for repair of long-standing rotator cuff tears. However, it is currently unknown to what extent the muscle and tendon contribute to the degree of total retraction. Further understanding of this may possibly influence the strategy of musculotendinous reconstruction.

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“…Because the cuff muscles of patients with chronic tears are substantially shorter than those of patients with intact cuff muscles [26], sudden lengthening can damage the plasma membrane of the fiber [5], and slow and progressive lengthening of chronically torn rotator cuff muscles can reverse fatty degeneration [8], the purpose of this study was to determine whether repairing chronically torn cuff tendons would induce an iatrogenic injury to the muscle. The results from the study indicate that acutely and chronically torn rotator cuff muscle fibers are damaged owing to surgical repair, although the chronically torn group shows much greater damage throughout the muscle.…”

Section: Discussionmentioning

confidence: 99%

“…The rotator cuff muscles of patients with chronic tears are markedly shorter than those of patients with intact cuff muscles [26]. Sudden and severe lengthening of the muscle fiber can damage the plasma membrane (sarcolemma), leading to a sustained influx of calcium ions in the fiber [5,25].…”

Section: Introductionmentioning

confidence: 99%

Muscle Fibers are Injured at the Time of Acute and Chronic Rotator Cuff Repair

Davis

Stafford

Jergenson

et al. 2015

Clinical Orthopaedics &Amp; Related Research

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In this animal model, we found that repair of chronically torn cuff muscles results in extensive injury throughout the muscle. Based on these findings, we posit that inducing a widespread injury at the time of surgical repair of chronically torn rotator cuff muscles may contribute to the problems of failed repairs or continued progression of fatty degeneration that is observed in some patients that undergo rotator cuff repair. Therapeutic interventions to protect muscle fiber membranes potentially could enhance outcomes for patients undergoing rotator cuff repair. To evaluate this, future studies that evaluate the use of membrane sealing compounds or drugs that upregulate endogenous membrane-sealing proteins are warranted.

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Sarcomere length of torn rotator cuff muscle

Cited by 31 publications

References 23 publications

Architectural and Biochemical Adaptations in Skeletal Muscle and Bone Following Rotator Cuff Injury in a Rat Model

Architectural and Biochemical Adaptations in Skeletal Muscle and Bone Following Rotator Cuff Injury in a Rat Model

Quantitative Analysis of Muscle and Tendon Retraction in Chronic Rotator Cuff Tears

Muscle Fibers are Injured at the Time of Acute and Chronic Rotator Cuff Repair

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