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Kazuo Kaneko - One of the best experts on this subject based on the ideXlab platform.
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Supraspinatus Muscle and tendon stiffness changes after arthroscopic rotator cuff repair a shear wave elastography assessment
Journal of Orthopaedic Research, 2020Co-Authors: Yoshiaki Itoigawa, Tomoki Wada, Takayuki Kawasaki, Daichi Morikawa, Yuichiro Maruyama, Kazuo KanekoAbstract:Re-tearing after arthroscopic rotator cuff repair (ARCR) frequently occurs, and high stiffness of the rotator cuff may be one of the factors. We investigated changes in stiffness of the Supraspinatus Muscle and tendon after ARCR as measured by shear wave elastography (SWE) with B-mode ultrasound, and compared the Supraspinatus Muscle stiffness of patients with recurrent tears and patients with healed rotator cuffs. Sixty patients with Supraspinatus tears requiring ARCR underwent serial SWE of their Supraspinatus Muscles and repaired tendons. SWE was performed before surgery (Pre-Op) and at 1 week, 1 month, 2 months, 3 months, 4 months, 5 months, and 6 months after surgery. Additionally, the repaired rotator cuffs were evaluated using magnetic resonance imaging at 6 months after surgery to classify patients into a healed rotator cuff group and a recurrent tear group. Differences in SWE values between the groups were assessed at each time point. The SWE value of the repaired tendon at 1 week after ARCR was significantly greater than at 3 and 6 months. The SWE value for the Supraspinatus Muscle at 1 month after ARCR surgery in the healed group was lower than at Pre-Op and 4, 5, and 6 months after surgery, and it was also lower than that at 1 month after surgery in the re-tear group. There were no significant differences between time points in the SWE values of the Supraspinatus Muscle in the re-tear group. The SWE value of the Muscle in the re-tear group was greater than in the healed group at 1 month after surgery (p < 0.05). Increased SWE values at 1 month after ARCR may predict recurrent rotator cuff tears after surgery rather than evaluating the tendon. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:219-227, 2020.
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Supraspinatus Muscle and Tendon Stiffness Changes After Arthroscopic Rotator Cuff Repair: A Shear Wave Elastography Assessment.
Journal of Orthopaedic Research, 2019Co-Authors: Yoshiaki Itoigawa, Tomoki Wada, Takayuki Kawasaki, Daichi Morikawa, Yuichiro Maruyama, Kazuo KanekoAbstract:Re-tearing after arthroscopic rotator cuff repair (ARCR) frequently occurs, and high stiffness of the rotator cuff may be one of the factors. We investigated changes in stiffness of the Supraspinatus Muscle and tendon after ARCR as measured by shear wave elastography (SWE) with B-mode ultrasound, and compared the Supraspinatus Muscle stiffness of patients with recurrent tears and patients with healed rotator cuffs. Sixty patients with Supraspinatus tears requiring ARCR underwent serial SWE of their Supraspinatus Muscles and repaired tendons. SWE was performed before surgery (Pre-Op) and at 1 week, 1 month, 2 months, 3 months, 4 months, 5 months, and 6 months after surgery. Additionally, the repaired rotator cuffs were evaluated using magnetic resonance imaging at 6 months after surgery to classify patients into a healed rotator cuff group and a recurrent tear group. Differences in SWE values between the groups were assessed at each time point. The SWE value of the repaired tendon at 1 week after ARCR was significantly greater than at 3 and 6 months. The SWE value for the Supraspinatus Muscle at 1 month after ARCR surgery in the healed group was lower than at Pre-Op and 4, 5, and 6 months after surgery, and it was also lower than that at 1 month after surgery in the re-tear group. There were no significant differences between time points in the SWE values of the Supraspinatus Muscle in the re-tear group. The SWE value of the Muscle in the re-tear group was greater than in the healed group at 1 month after surgery (p
Yoshiaki Itoigawa - One of the best experts on this subject based on the ideXlab platform.
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Supraspinatus Muscle and tendon stiffness changes after arthroscopic rotator cuff repair a shear wave elastography assessment
Journal of Orthopaedic Research, 2020Co-Authors: Yoshiaki Itoigawa, Tomoki Wada, Takayuki Kawasaki, Daichi Morikawa, Yuichiro Maruyama, Kazuo KanekoAbstract:Re-tearing after arthroscopic rotator cuff repair (ARCR) frequently occurs, and high stiffness of the rotator cuff may be one of the factors. We investigated changes in stiffness of the Supraspinatus Muscle and tendon after ARCR as measured by shear wave elastography (SWE) with B-mode ultrasound, and compared the Supraspinatus Muscle stiffness of patients with recurrent tears and patients with healed rotator cuffs. Sixty patients with Supraspinatus tears requiring ARCR underwent serial SWE of their Supraspinatus Muscles and repaired tendons. SWE was performed before surgery (Pre-Op) and at 1 week, 1 month, 2 months, 3 months, 4 months, 5 months, and 6 months after surgery. Additionally, the repaired rotator cuffs were evaluated using magnetic resonance imaging at 6 months after surgery to classify patients into a healed rotator cuff group and a recurrent tear group. Differences in SWE values between the groups were assessed at each time point. The SWE value of the repaired tendon at 1 week after ARCR was significantly greater than at 3 and 6 months. The SWE value for the Supraspinatus Muscle at 1 month after ARCR surgery in the healed group was lower than at Pre-Op and 4, 5, and 6 months after surgery, and it was also lower than that at 1 month after surgery in the re-tear group. There were no significant differences between time points in the SWE values of the Supraspinatus Muscle in the re-tear group. The SWE value of the Muscle in the re-tear group was greater than in the healed group at 1 month after surgery (p < 0.05). Increased SWE values at 1 month after ARCR may predict recurrent rotator cuff tears after surgery rather than evaluating the tendon. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:219-227, 2020.
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Supraspinatus Muscle and Tendon Stiffness Changes After Arthroscopic Rotator Cuff Repair: A Shear Wave Elastography Assessment.
Journal of Orthopaedic Research, 2019Co-Authors: Yoshiaki Itoigawa, Tomoki Wada, Takayuki Kawasaki, Daichi Morikawa, Yuichiro Maruyama, Kazuo KanekoAbstract:Re-tearing after arthroscopic rotator cuff repair (ARCR) frequently occurs, and high stiffness of the rotator cuff may be one of the factors. We investigated changes in stiffness of the Supraspinatus Muscle and tendon after ARCR as measured by shear wave elastography (SWE) with B-mode ultrasound, and compared the Supraspinatus Muscle stiffness of patients with recurrent tears and patients with healed rotator cuffs. Sixty patients with Supraspinatus tears requiring ARCR underwent serial SWE of their Supraspinatus Muscles and repaired tendons. SWE was performed before surgery (Pre-Op) and at 1 week, 1 month, 2 months, 3 months, 4 months, 5 months, and 6 months after surgery. Additionally, the repaired rotator cuffs were evaluated using magnetic resonance imaging at 6 months after surgery to classify patients into a healed rotator cuff group and a recurrent tear group. Differences in SWE values between the groups were assessed at each time point. The SWE value of the repaired tendon at 1 week after ARCR was significantly greater than at 3 and 6 months. The SWE value for the Supraspinatus Muscle at 1 month after ARCR surgery in the healed group was lower than at Pre-Op and 4, 5, and 6 months after surgery, and it was also lower than that at 1 month after surgery in the re-tear group. There were no significant differences between time points in the SWE values of the Supraspinatus Muscle in the re-tear group. The SWE value of the Muscle in the re-tear group was greater than in the healed group at 1 month after surgery (p
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Feasibility assessment of shear wave elastography to rotator cuff Muscle
Clinical Anatomy, 2014Co-Authors: Yoshiaki Itoigawa, Eiji Itoi, John W. Sperling, Scott P. Steinmann, Qingshan Chen, Pengfei Song, Shigao Chen, Taku HattaAbstract:Pre-surgical measurement of Supraspinatus Muscle extensibility is important for rotator cuff repair. The purpose of the present study was to explore the potential feasibility of a shear wave ultrasound elastography (SWE)-based method, combined with B-mode ultrasound, to measure the in vivo stiffness of the Supraspinatus Muscle non-invasively and thus obtain key information about Supraspinatus Muscle extensibility. Our investigation comprised two steps. First, we determined the orientation of the Supraspinatus Muscle fibers in cadaveric shoulders without rotator cuff tear in order to optimize the ultrasound probe positions for SWE imaging. Second, we investigated the feasibility of quantifying the stiffness of the normal Supraspinatus Muscle by SWE in vivo. The Supraspinatus Muscle was divided into four anatomical regions: anterior superficial (AS), posterior superficial (PS), anterior deep (AD), and posterior deep (PD). Each region was examined by SWE. The SWE stiffnesses of AD, AS, PD, and PS were 40.0 ± 12.4, 34.0 ± 9.9, 32.7 ± 12.7, 39.1 ± 15.7 kPa, respectively. SWE combined with B-Mode ultrasound imaging could be a feasible method for quantifying the local stiffness of the rotator cuff Muscles. Clin. Anat. 28:213–218, 2015. © 2014 Wiley Periodicals, Inc.
Christian Gerber - One of the best experts on this subject based on the ideXlab platform.
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Quantitative Shear-Wave US Elastography of the Supraspinatus Muscle: Reliability of the Method and Relation to Tendon Integrity and Muscle Quality
Radiology, 2015Co-Authors: Andrea B. Rosskopf, Christian Gerber, Christine Ehrmann, Florian M. Buck, Martin Flück, Christian W. A. PfirrmannAbstract:Shear-wave velocity tends to decrease with increasing fatty infiltration of the Supraspinatus Muscle, tends to increase in the final stage of fatty infiltration (Goutallier stage IV), and shows a significant negative correlation with Muscle atrophy.
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Retraction of Supraspinatus Muscle and Tendon as Predictors of Success of Rotator Cuff Repair
American Journal of Sports Medicine, 2012Co-Authors: Dominik C. Meyer, Karl Wieser, Mazda Farshad, Christian GerberAbstract:Background:The structural failure rate of rotator cuff repair can exceed 50%. Important predictors for repair failure are preoperative fatty Muscle infiltration and myotendinous retraction.Purpose:To quantitatively assess the prognostic value of preoperative retraction of both the Supraspinatus Muscle and tendon for the outcome of Supraspinatus repair.Study Design:Cohort study; Level of evidence, 3.Methods:In 33 shoulders with complete Supraspinatus tendon ruptures subjected to arthroscopic repair, magnetic resonance imaging (MRI) scans taken preoperatively and after a mean follow-up of 24 months were studied. The exact position of the lateral extension of the Supraspinatus Muscle and of the tendon end was evaluated and correlated with the preoperative stage of fatty infiltration (Goutallier) and the failure rate of tendon repair.Results:The mean lengthening of the Muscle and tendon end was −3 mm and 4 mm in the failed repairs (n = 19) and 14 mm and 8 mm in the successful repairs (n = 14). If the supraspi...
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A modified rabbit model for rotator cuff tendon tears: functional, histological and radiological characteristics of the Supraspinatus Muscle
Shoulder & Elbow, 2012Co-Authors: Mazda Farshad, Dominik C. Meyer, Katja Nuss, Christian GerberAbstract:Background: A well-defined, reproducible small animal model that allows quantitative assessment of musculotendinous changes would be desirable for investigations concerning rotator cuff pathology. Methods: The Supraspinatus tendon was released by osteotomy of the greater tuberosity in seven New Zealand rabbits. The musculotendinous unit was then allowed to retract during 6 weeks. Retraction was monitored with computed tomography (CT). At sacrifice, CT measurements of retraction were validated by measurement of the total length of the musculotendinous unit after sacrifice and by correlation with functional and structural properties of the musculotendinous unit at tendon release and at sacrifice. Results: Mean(SD) retraction of the musculotendinous unit was 1.8 (0.2) cm on CT, precisely, and negatively correlated with the total length of the retracted musculotendinous unit at sacrifice (r = −0.87, p = 0.011) but not significantly correlated with CT measurements of atrophy (r = 0.20, p = 0.699) or fatty infiltration (r = 0.13, p = 0.78). Mean (SD) Muscle work decreased from 1.6 (0.23) Nm to 1.2 (1) Nm (p = 0.056). Mean (SD) Muscle fibre diameter decreased from 65 (10) µm to 48 (16) µm (p = 0.063). This decrease was significantly correlated with the amount of fatty infiltration (r = 0.79, p = 0.033). Discussion: Tendon release using osteotomy of the rabbit greater tuberosity allows precise measurement of musculotendinous retraction and offers the possibility for functional muscular testing. Changes in the rabbit Supraspinatus Muscle caused by myotendinous retraction correspond to those observed in established sheep models.
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STRUCTURE AND CONTRACTILE FORCE OF THE Supraspinatus Muscle IS CORRELATED WITH THE RESULTS OF ROTATOR CUFF RECONSTRUCTION
2008Co-Authors: Dominik Meyer, Hans Hoppeler, Christian GerberAbstract:Purpose of the study: Muscles contract after a full thickness tear their tendon. The Muscle then undergoes atrophy and fatty degeneration. These changes produce effects well described by histology, computed tomography and magnetic resonance imaging (MRI). To date however, the correlation of this process with the future conractile force of the Muscle and the prognosis after cuff repain has been poorly understood. Material and methods: Thirteen patients with a full thickness tear of the Supraspinatus Muscle were treated surgically by cuff suture. The shoulders were examined clinically and MRI. During the operation, the supra-scapular nerve was stimulated with a supramaximal voltage to obtain maximal Muscle contraction which was measured. Biopsy specimens of the Supraspinatus were taken before and after surgical repair in order to determine whether Muscle activity during stimulation have any histological impact. The intraoperative measurements were compared with the MRI findings and the physical examination performed preoperative and at six weeks, six months and twelve months after surgery. Results: Maximal force of the Supraspinatus Muscle was 200N, which is greater than the force of a direct suture repair. The maximal force was clearly correlated with Muscle atrophy and fatty degeneration: by surface area, force was 12N/cm 2 for Goutallier grade 3 and 42 N/m 2 for grade 0. Five of the thirteen repairs ended with a secondary tear, the Muscle in four of the five patients was among the six strongest Muscles. The fifth case was the weakest Muscle of all. The histological study revealed a larger quantity of lipofuchin in the Muscle with atrophy and a change in the fiber structure. Analysis of the results did not demonstrate any lesions caused by the tension during the operation. MRI demonstrated one case of repair without secondary tear, the fatty infiltration had not improved and the atrophy only partially. In Muscles with secondary tears, atrophy and fatty degeneration progressed significantly. Discussion and conclusion: There is a risk of rupture of the Supraspinatus tendon in the event of Muscle atrophy but also for good quality Muscle. The capacity of a Muscle to develop force strongly depends on the state of atrophy and fatty degeneration. Atrophy can regress after reconstruction without secondary tear, but fatty degeneration is irreversible.
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Asymmetric atrophy of the Supraspinatus Muscle following tendon tear
Journal of Orthopaedic Research, 2005Co-Authors: Dominik C. Meyer, Christian W. A. Pfirrmann, Marco Zanetti, Christoph Pirkl, Christian GerberAbstract:Abstract Muscle atrophy is a known consequence of Muscle disuse, Muscle denervation and tendon tear. Whereas after nerve injury Muscle atrophies in the denervated area, the distribution of Muscle atrophy following tear of its tendon is not known. Standardized MRI scans of 64 consecutive, painful shoulders were evaluated for Supraspinatus tendon tearing, myotendinous retraction, Supraspinatus Muscle atrophy, fatty infiltration, ratio of the scapular (deep) and fascial (superficial) Muscle area (“symmetry”) and position of the central tendon within the Supraspinatus fossa. There were thirteen shoulders with no and eleven shoulders with partial thickness Supraspinatus tendon tears. In the forty cases with full thickness tendon tear, there was significant Muscle atrophy and fatty infiltration. Atrophy of the fascial Muscle portion was 43%, on the bony side it was 9% ( p Muscular changes following tendon tear occur highly asymmetrically: The Muscle portion originating from the fascia primarily atrophies, the portion originating from the scapula primarily undergoes fatty infiltration. Muscular changes are not simply a consequence of Muscle disuse, but dependent on architectural changes in the Muscle.
Tae Im Yi - One of the best experts on this subject based on the ideXlab platform.
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reliability of the Supraspinatus Muscle thickness measurement by ultrasonography
Annals of Rehabilitation Medicine, 2012Co-Authors: Tae Im YiAbstract:OBJECTIVE: To assess the intrarater and interrater reliability of the Supraspinatus thickness measured by ultrasonography (US) in normal subjects and to identify the relationship between the Supraspinatus thickness measured by US and cross sectional area (CSA) of the Supraspinatus Muscle by magnetic resonance imaging (MRI) in hemiplegic patients. METHOD: We examined 20 shoulders of normal subjects and 10 shoulders of hemiplegic patients. In normal subjects, one examiner measured the Supraspinatus thickness twice by US at the scapular notch and another examiner measured the Supraspinatus thickness several days later. The intrarater and interrater reliability of Supraspinatus thickness measurements were then evaluated. In hemiplegic patients, the Supraspinatus thickness at the scapular notch was measured by US in affected side and compared with CSA of the Supraspinatus Muscle at the scapular notch and the Y-view of MRI. RESULTS: One examiner's Supraspinatus thickness measurement average was 1.72±0.21 cm and 1.74±0.24 cm, and the other examiner's Supraspinatus thickness measurement average was 1.74±0.22 cm in normal subjects. Intraclass correlation coefficients of intrarater and interrater examination were 0.91 and 0.88, respectively. For hemiplegic patients, the Supraspinatus thickness measured by US was 1.66±0.13 cm and CSA by MRI was 4.83±0.88 cm(2) at the Y-view and 5.61±1.19 cm(2) at the scapular notch. The Pearson Correlation Coefficient between the Supraspinatus thickness at the scapular notch and the CSA at the Y-view was 0.72 and that between the Supraspinatus thickness and CSA at the scapular notch was 0.76. CONCLUSION: The Supraspinatus thickness measurement by US is a reliable method and is positively correlated with the CSA of the Supraspinatus Muscle in MRI in hemiplegic patients. Therefore, Supraspinatus thickness measurement by US can be used in the evaluation of Muscle atrophy and to determine therapeutic effects in hemiplegic patients.
Ronald S. Adler - One of the best experts on this subject based on the ideXlab platform.
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Supraspinatus Muscle shear wave elastography (SWE): detection of biomechanical differences with varying tendon quality prior to gray-scale morphologic changes.
Skeletal Radiology, 2019Co-Authors: Dana J. Lin, Christopher J. Burke, Benjamin Abiri, James S. Babb, Ronald S. AdlerAbstract:The purpose of this study was to determine whether SWE can detect biomechanical changes in the Supraspinatus Muscle that occur with increasing Supraspinatus tendon abnormality prior to morphologic gray-scale changes. An IRB approved, HIPAA compliant retrospective study of shoulder ultrasounds from 2013–2018 was performed. The cohort consisted of 88 patients (mean age 55 ± 15 years old) with 110 ultrasounds. Images were acquired in longitudinal orientation to the Supraspinatus Muscle with shear wave velocity (SWV) point quantification. The tendon and Muscle were graded in order of increasing tendinosis/tear (1–4 scale) and increasing fatty infiltration (0–3 scale). Mixed model analysis of variance, analysis of covariance, and Spearman rank correlation were used for statistical analysis. There was no statistically significant age or sex dependence for Supraspinatus Muscle SWV (p = 0.314, 0.118, respectively). There was no significant correlation between Muscle SWV and Muscle or tendon grade (p = 0.317, 0.691, respectively). In patients with morphologically normal Muscle on gray-scale ultrasound, there were significant differences in Muscle SWV when comparing tendon grade 3 with grades 1, 2, and 4 (p = 0.018, 0.025, 0.014, respectively), even when adjusting for gender and age (p = 0.044, 0.028, 0.018, respectively). Pairwise comparison of tendon grades other than those mentioned did not achieve statistical significance (p > 0.05). SWE can detect biomechanical differences within the Supraspinatus Muscle that are not morphologically evident on gray-scale ultrasound. Specifically, Supraspinatus tendon partial tears with moderate to severe tendinosis may correspond to biomechanically distinct Muscle properties compared to both lower grades of tendon abnormality and full-thickness tears.
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Supraspinatus Muscle shear wave elastography (SWE): detection of biomechanical differences with varying tendon quality prior to gray-scale morphologic changes
Skeletal Radiology, 2019Co-Authors: Dana J. Lin, Christopher J. Burke, Benjamin Abiri, James S. Babb, Ronald S. AdlerAbstract:Objective The purpose of this study was to determine whether SWE can detect biomechanical changes in the Supraspinatus Muscle that occur with increasing Supraspinatus tendon abnormality prior to morphologic gray-scale changes. Materials and methods An IRB approved, HIPAA compliant retrospective study of shoulder ultrasounds from 2013–2018 was performed. The cohort consisted of 88 patients (mean age 55 ± 15 years old) with 110 ultrasounds. Images were acquired in longitudinal orientation to the Supraspinatus Muscle with shear wave velocity (SWV) point quantification. The tendon and Muscle were graded in order of increasing tendinosis/tear (1–4 scale) and increasing fatty infiltration (0–3 scale). Mixed model analysis of variance, analysis of covariance, and Spearman rank correlation were used for statistical analysis. Results There was no statistically significant age or sex dependence for Supraspinatus Muscle SWV (p = 0.314, 0.118, respectively). There was no significant correlation between Muscle SWV and Muscle or tendon grade (p = 0.317, 0.691, respectively). In patients with morphologically normal Muscle on gray-scale ultrasound, there were significant differences in Muscle SWV when comparing tendon grade 3 with grades 1, 2, and 4 (p = 0.018, 0.025, 0.014, respectively), even when adjusting for gender and age (p = 0.044, 0.028, 0.018, respectively). Pairwise comparison of tendon grades other than those mentioned did not achieve statistical significance (p > 0.05). Conclusion SWE can detect biomechanical differences within the Supraspinatus Muscle that are not morphologically evident on gray-scale ultrasound. Specifically, Supraspinatus tendon partial tears with moderate to severe tendinosis may correspond to biomechanically distinct Muscle properties compared to both lower grades of tendon abnormality and full-thickness tears.