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https://read.qxmd.com/read/30826203/biomechanics-of-lower-trapezius-and-latissimus-dorsi-transfers-in-rotator-cuff-deficient-shoulders
#1
Akhil Reddy, Lawrence V Gulotta, Xiang Chen, Alessandro Castagna, David M Dines, Russell F Warren, Andreas Kontaxis
BACKGROUND: Irreparable posterosuperior rotator cuff tears cause pain and impaired shoulder function. Latissimus dorsi (LD) transfer has been proven to improve shoulder function, but lower trapezius (LT) transfer has recently been proposed as an alternative. This study aimed to compare the biomechanics of LD and LT transfers and how they are affected by different insertion sites. METHODS: The Newcastle shoulder model was used to investigate the biomechanics of these 2 tendon transfers...
February 27, 2019: Journal of Shoulder and Elbow Surgery
https://read.qxmd.com/read/30770957/an-intact-subscapularis-tendon-and-compensatory-teres-minor-hypertrophy-yield-lower-failure-rates-for-non-operative-treatment-of-irreparable-massive-rotator-cuff-tears
#2
Tae-Hwan Yoon, Sung-Jae Kim, Chong-Hyuk Choi, Soon-Phil Yoon, Yong-Min Chun
PURPOSE: To investigate whether subscapularis integrity and compensatory teres, minor hypertrophy is associated with maintaining relatively good function and tolerable pain levels during non-operative treatment. METHODS: This study included 108 patients with irreparable, massive rotator cuff tears involving at least two tendons and stage III or IV muscle hypotrophy and fatty infiltration on oblique sagittal magnetic resonance imaging, in which even a partial repair does not seem feasible...
February 15, 2019: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://read.qxmd.com/read/30734521/prevalence-of-myofascial-trigger-points-in-post-stroke-patients-with-painful-shoulders-a-cross-sectional-study
#3
Jorge Hugo Villafañe, Maria Pilar Lopez-Royo, Pablo Herrero, Kristin Valdes, Raquel Cantero-Téllez, Paolo Pedersini, Stefano Negrini
BACKGROUND: In patients with stroke, hemiplegic shoulder pain can be a major problem. One source of shoulder pain can be Myofascial Trigger Points (MTrPs). OBJECTIVE: To determine the prevalence of Myofascial Trigger Points (MTrPs) and the correlation between MTrPs and pain and function in patients presenting with shoulder pain following a stroke. DESIGN: Cross sectional study SETTING: IRCSS Fondazione Don Carlo Gnocchi. PATIENTS: A total of 50 patients with stroke with shoulder pain...
February 7, 2019: PM & R: the Journal of Injury, Function, and Rehabilitation
https://read.qxmd.com/read/30707407/approach-to-latissimus-dorsi-and-teres-minor-injuries-in-the-baseball-pitcher
#4
REVIEW
Brandon J Erickson, Nina Petronico, Anthony A Romeo
PURPOSE OF REVIEW: Tears of the latissimus dorsi and teres major are uncommon but significant injuries, most frequently seen in high-level, overhead throwing athletes. Diagnosis can be challenging, as there are no pathognomonic signs, symptoms, or physical exam findings associated with latissimus dorsi/teres major tears, and the clinician must have a high suspicion for this injury. While many of these tears can be treated non-operatively, a subset of these benefits from surgical intervention...
February 1, 2019: Current Reviews in Musculoskeletal Medicine
https://read.qxmd.com/read/30691988/the-effect-of-subscapularis-muscle-contraction-on-coaptation-of-anteroinferior-glenohumeral-ligament-labrum-complex-after-bankart-repair
#5
Yoshiaki Itoigawa, Alexander W Hooke, John W Sperling, Scott P Steinmann, Kristin D Zhao, Eiji Itoi, Kai-Nan An
Facilitation of healing is important for the anteroinferior glenohumeral ligament-labrum complex (AIGHL-LC) after Bankart repair in shoulder dislocation. The purpose of this study was to investigate the effect of subscapularis muscle loading on contact area and contact pressure between the subscapularis and AIGHL-LC and between the glenoid bone and the AIGHL-LC following Bankart repair. Twenty-two fresh-frozen cadaveric shoulders were used. They were attached to a shoulder-positioning device to which a compression force was applied...
January 22, 2019: Journal of Biomechanics
https://read.qxmd.com/read/30675582/arthroscopic-repair-of-an-isolated-teres-minor-tear-with-associated-posterior-glenohumeral-ligament-avulsion
#6
Aaron Schwartz, Spero Karas
No abstract text is available yet for this article.
July 2018: JSES Open Access
https://read.qxmd.com/read/30578674/disease-duration-and-disability-in-dysfelinopathy-can-be-described-by-muscle-imaging-using-heatmaps-and-random-forests
#7
David Gómez-Andrés, Jorge Díaz, Francina Munell, Ángel Sánchez-Montáñez, Irene Pulido-Valdeolivas, Lionel Suazo, Cristián Garrido, Susana Quijano-Roy, Jorge A Bevilacqua
INTRODUCTION: The manner in which imaging patterns change over the disease course and with increasing disability in dysferlinopathy is not fully understood. METHODS: Fibroadipose infiltration of 61 muscles was scored based on whole-body MRI of 33 patients with dysferlinopathy and represented in a heatmap. We trained random forests to predict disease duration, motor function measure dimension 1 (MFM-D1) and modified Rankin scale (mRS) based on muscle scoring and selected the most important muscle for predictions...
December 22, 2018: Muscle & Nerve
https://read.qxmd.com/read/30509517/occupational-cranking-operations-the-scapula-perspective
#8
Jia-Hua Lin, Xu Xu
Cranking the landing gear is a common task performed by truck drivers to raise or lower trailers. This task poses a risk to the shoulder joint due to the required forceful exertion and the posture constrained to the hand-handle interface. As a potential occupational risk, there has been no definitive guideline for best practices among truck drivers. An operator can crank perpendicular (frontal) or parallel (sagittal) to the crank rotation. In this laboratory study, the effects of cranking method and resistance on scapular range of motion and shoulder muscle activity were observed in 12 participants...
February 2019: Applied Ergonomics
https://read.qxmd.com/read/30480598/clinical-and-radiographic-outcomes-of-a-posteriorly-augmented-glenoid-component-in-anatomic-total-shoulder-arthroplasty-for-primary-osteoarthritis-with-posterior-glenoid-bone-loss
#9
Jason C Ho, Michael H Amini, Vahid Entezari, Bong Jae Jun, Bashar Alolabi, Eric T Ricchetti, Joseph P Iannotti
BACKGROUND: The primary objectives of this study were to evaluate the ability of a posteriorly stepped augmented glenoid component, used in patients with primary glenohumeral osteoarthritis with B2 or B3 glenoid morphology, to correct preoperative retroversion and humeral head subluxation and to identify factors associated with radiographic radiolucency and patient-reported clinical outcomes. METHODS: We identified 71 shoulders with B2 or B3 glenoid morphology that underwent anatomic total shoulder arthroplasty with use of a posteriorly stepped augmented glenoid component and with a preoperative 3-dimensional computed tomography (3D-CT) scan and a minimum of 2 years of clinical and radiographic follow-up...
November 21, 2018: Journal of Bone and Joint Surgery. American Volume
https://read.qxmd.com/read/30428810/cadaveric-dissection-of-the-axillary-nerve-an-investigation-of-extra-muscular-and-intra-muscular-branching-patterns
#10
Pratik Rastogi, David A Stewart, Richard D Lawson, Dominique M Tremblay, Belinda J Smith, Michael A Tonkin
BACKGROUND: Variations in the axillary nerve branching patterns have been reported. The aim of the study is to investigate the extra- and intra-muscular course of the axillary nerve and quantify the regional innervation of the deltoid. METHODS: In fresh frozen specimens, the origin of the axillary nerve from the posterior cord of the brachial plexus and its extra- and intra-muscular course were identified. Muscle dimensions, branching patterns and the distance from the axillary nerve origin to major branches were measured...
December 2018: Journal of Hand Surgery Asian-Pacific Volume
https://read.qxmd.com/read/30411350/the-moment-arms-of-the-muscles-spanning-the-glenohumeral-joint-a-systematic-review
#11
REVIEW
Freya Hik, David C Ackland
The moment arm of a muscle represents its leverage or torque-producing capacity, and is indicative of the role of the muscle in joint actuation. The objective of this study was to undertake a systematic review of the moment arms of the major muscles spanning the glenohumeral joint during abduction, flexion and axial rotation. Moment arm data for the deltoid, pectoralis major, latissimus dorsi, teres major, supraspinatus, infraspinatus, subscapularis and teres minor were reported when measured using the geometric and tendon excursion methods...
November 8, 2018: Journal of Anatomy
https://read.qxmd.com/read/30384184/the-presence-of-a-rotator-cuff-tear-interferes-with-age-dependent-muscle-atrophy-of-intact-shoulder-muscles-an-mri-study-with-3-years-follow-up
#12
Arjen Kolk, Peer van der Zwaal, Bregje J W Thomassen, Elisabeth W C van de Kamp, Theo Stijnen, Jurriaan H de Groot, Rob G H H Nelissen
Rotator cuff muscle atrophy is frequently studied, but it is unknown whether redistribution of mechanical load in the presence of a rotator cuff tear influence muscle atrophy that is observed in patients. We hypothesized that in the presence of a supraspinatus tear, redistribution of mechanical load towards teres minor and deltoid slows down atrophy of these muscles over time. In this retrospective observational study of 129 patients, we measured the cross-sectional surface-areas on MRI of shoulder muscles in an intact rotator cuff (n = 92) and in a supraspinatus-tear group (n = 37) with a mean follow-up of 3 ± 1...
October 26, 2018: Human Movement Science
https://read.qxmd.com/read/30362668/proposed-surgical-technique-to-facilitate-targeted-reinnervation-of-the-infraspinatus-a-cadaveric-feasibility-study
#13
Cody C Wyles, Andrés A Maldonado, Eric R Wagner, Matthew T Houdek, Nirusha Lachman, Robert J Spinner
Restoration of shoulder lateral rotation remains a significant challenge following brachial plexus injury. Transfer of the accessory nerve to suprascapular nerve (SSN) has been widely performed, although with generally poor outcomes for lateral rotation. A recent report suggested a selective infraspinatus reinnervation technique using a radial nerve branch for SSN transfer. This cadaveric study was performed in 7 specimens (14 shoulders). We present technical modifications to achieve additional length to the recipient nerve (suprascapular) that would facilitate direct repair...
January 2019: Clinical Anatomy
https://read.qxmd.com/read/30328483/optimizing-methods-to-quantify-intramuscular-fat-in-rotator-cuff-tears-with-normalization
#14
Paul S Micevych, Ankur Garg, Lucas T Buchler, Guido Marra, Matthew D Saltzman, Todd B Parrish, Amee L Seitz
OBJECTIVE: To determine which normalization method may best account for confounding individual factors, such as age or BMI, when quantifying fat infiltration on MRI in patients with rotator cuff tears, the effects of normalization using three different muscles (teres major; triceps brachii; teres minor) were compared. METHODS: Thirty-seven consecutive patients diagnosed with rotator cuff pathology were included. MRI fat-water sequences were used to quantify rotator cuff intramuscular fat (%fat)...
October 17, 2018: Skeletal Radiology
https://read.qxmd.com/read/30233984/novel-arthroscopic-tendon-transfers-for-posterosuperior-rotator-cuff-tears-latissimus-dorsi-and-lower-trapezius-transfers
#15
Eric R Wagner, Jarret M Woodmass, Kathryn M Welp, Michelle J Chang, Bassem T Elhassan, Laurence D Higgins, Jon J P Warner
Background: Massive irreparable rotator cuff tears in both the primary and the revision setting are challenging problems. There remains controversy over the ideal treatment methods for these patients. In the case of an irreparable posterosuperior rotator cuff tear, tendon transfers1-12 have emerged as a reliable option, with a durable outcome. The most commonly used tendon transfer options are the latissimus dorsi (LD)1-6 and the lower trapezius (LT)12 . Description: The LD transfer is performed by first harvesting the LT tendon from the humeral shaft...
June 27, 2018: JBJS Essential Surgical Techniques
https://read.qxmd.com/read/30091009/the-pattern-of-idiopathic-isolated-teres-minor-atrophy-with-regard-to-its-two-bundle-anatomy
#16
Yusuhn Kang, Joong Mo Ahn, Choong Guen Chee, Eugene Lee, Joon Woo Lee, Heung Sik Kang
OBJECTIVE: We aimed to analyze the pattern of teres minor atrophy with regard to its two-bundle anatomy and to assess its association with clinical factors. MATERIALS AND METHODS: Shoulder MRIs performed between January and December 2016 were retrospectively reviewed. Images were evaluated for the presence and pattern of isolated teres minor atrophy. Isolated teres minor atrophy was categorized into complete or partial pattern, and partial pattern was further classified according to the portion of the muscle that was predominantly affected...
August 8, 2018: Skeletal Radiology
https://read.qxmd.com/read/30062459/retaining-or-excising-the-supraspinatus-tendon-in-complex-proximal-humeral-fractures-treated-with-reverse-prosthesis-a-biomechanical-analysis-in-two-different-designs
#17
Joan Miquel, F Santana, E Palau, M Vinagre, K Langohr, A Casals, C Torrens
PURPOSE: We aimed to biomechanically evaluate the effect of the supraspinatus tendon on tuberosity stability using two different reverse shoulder arthroplasty (RSA) models for complex proximal humeral fractures (PHFs). METHODS: Four-part proximal humeral fractures were simulated in 20 cadaveric shoulders. Two different RSA designs were implemented: a glenosphere-medialized model and a glenosphere-lateralized model. Tuberosities were reconstructed, and displacement of bony fragments was measured (mm) by placing three sensors: in the humeral diaphysis (D), in the greater tuberosity (GT), and in the lesser tuberosity (LT)...
July 31, 2018: Archives of Orthopaedic and Trauma Surgery
https://read.qxmd.com/read/30040788/effects-of-selected-rehabilitative-exercises-on-external-rotator-muscles-and-trapezius-muscles-of-masonry-workers
#18
Greesh Kumar Singh, Sanjay Srivastava, Mukesh Kumar, Shellyka Ratnakar
BACKGROUND: Masonry workers engaged in occupational work-activities have high risk of shoulder injury that often develops to functional loss and disability. Rehabilitative exercises (REs) have potential for slowing this development. OBJECTIVE: The objective is to study the effects of three selected REs on integrated electromyography activations of the external rotator muscles and trapezius muscles of masonry workers. METHODS: Ten subjects, masonry workers having shoulder pain, have volunteered for this study...
2018: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://read.qxmd.com/read/30010102/electromyographic-analysis-of-selected-shoulder-muscles-during-rehabilitation-exercises
#19
Mukesh Kumar, Sanjay Srivastava, V Soami Das
BACKGROUND: Overhead work-activities and repetitive use of arm in occupational tasks are known risk factors to cause shoulder injury that often develops to functional disability. Rehabilitation exercises (REs) are capable of slowing this development. OBJECTIVE: The main objective of the present work is to experiment with common REs and to identify those which produce significant integrated electromyography (iEMG) activation of selected shoulder muscles namely, posterior deltoid, infraspinatus, teres minor, upper trapezius, middle trapezius and lower trapezius...
2018: Journal of Back and Musculoskeletal Rehabilitation
https://read.qxmd.com/read/29987440/rotator-cable-in-pathological-shoulders-comparison-with-normal-anatomy-in-a-cadaveric-study
#20
Michał Tomasz Podgórski, Łukasz Olewnik, Piotr Grzelak, Michał Polguj, Mirosław Topol
The rotator cable is a semicircular thickening of the glenohumeral joint capsule. It travels between tubercles of the humerus and interweaves with the supra- and infraspinatus muscle tendons. The rotator cable anchors these tendons to the tubercles, playing the role of a suspension bridge. However, little is known about the modifications of this cable that result from pathologies to the rotator cuff tendons. Thus, we aim to compare the morphology of the normal rotator cable with cables in specimens with rotator cuff injuries...
July 10, 2018: Anatomical Science International
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