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https://www.readbyqxmd.com/read/30509517/occupational-cranking-operations-the-scapula-perspective
#1
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://www.readbyqxmd.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
#2
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://www.readbyqxmd.com/read/30428810/cadaveric-dissection-of-the-axillary-nerve-an-investigation-of-extra-muscular-and-intra-muscular-branching-patterns
#3
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://www.readbyqxmd.com/read/30411350/the-moment-arms-of-the-muscles-spanning-the-glenohumeral-joint-a-systematic-review
#4
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://www.readbyqxmd.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
#5
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://www.readbyqxmd.com/read/30362668/proposed-surgical-technique-to-facilitate-targeted-reinnervation-of-the-infraspinatus-a-cadaveric-feasibility-study
#6
Cody C Wyles, Andrés A Maldonado, Eric R Wagner, Matthew T Houdek, Nirusha Lachman, Robert J Spinner
INTRODUCTION: 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. METHODS: 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...
October 26, 2018: Clinical Anatomy
https://www.readbyqxmd.com/read/30328483/optimizing-methods-to-quantify-intramuscular-fat-in-rotator-cuff-tears-with-normalization
#7
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://www.readbyqxmd.com/read/30233984/novel-arthroscopic-tendon-transfers-for-posterosuperior-rotator-cuff-tears-latissimus-dorsi-and-lower-trapezius-transfers
#8
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://www.readbyqxmd.com/read/30091009/the-pattern-of-idiopathic-isolated-teres-minor-atrophy-with-regard-to-its-two-bundle-anatomy
#9
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://www.readbyqxmd.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
#10
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://www.readbyqxmd.com/read/30040788/effects-of-selected-rehabilitative-exercises-on-external-rotator-muscles-and-trapezius-muscles-of-masonry-workers
#11
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://www.readbyqxmd.com/read/30010102/electromyographic-analysis-of-selected-shoulder-muscles-during-rehabilitation-exercises
#12
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://www.readbyqxmd.com/read/29987440/rotator-cable-in-pathological-shoulders-comparison-with-normal-anatomy-in-a-cadaveric-study
#13
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
https://www.readbyqxmd.com/read/29954661/rotator-cuff-contact-pressures-at-the-tendon-implant-interface-after-anatomic-total-shoulder-arthroplasty-using-a-metal-backed-glenoid-component
#14
Richard Thomas, Martin Richardson, Minoo Patel, Richard Page, Morgan Sangeux, David C Ackland
BACKGROUND: Rotator cuff tears following anatomic total shoulder arthroplasty increase with duration of follow-up. This study aimed to evaluate contact pressure between the rotator cuff tendons and prosthesis after anatomic total shoulder arthroplasty and compare these with the tendon-contact pressures in the native shoulder. METHODS: Eight entire upper extremities were mounted onto a testing apparatus, and simulated muscle loading was applied to each rotator cuff tendon with the shoulder positioned in abduction, internal rotation, and external rotation...
June 25, 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29945400/-precise-application-of-traditional-chinese-medicine-in-minimally-invasive-techniques
#15
Fu-Hui Dong
The miminally-invasive techniques of traditional Chinese medicine(TCM) uses different types of acupuncture needles to treat diseased locations with special techniques. These techniques include different methods of insertion and closed incision (press cutting, sliding cutting, scrape cutting, etc.). This needling technique is based on the traditional Chinese medicine theories of Pi Bu (cutaneous), Jing Jin (sinew), Jing Luo (meridian), Wu Ti (five body structure components) and Zang Fu (organ system). Commonly used needles include: needle Dao , needle with edge, Pi needle, Shui needle, Ren needle, Gou needle, Chang Yuan needle, Bo needle and so on...
June 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29881921/anatomic-analysis-of-the-whole-articular-capsule-of-the-shoulder-joint-with-reference-to-the-capsular-attachment-and-thickness
#16
Daisuke Momma, Akimoto Nimura, Satoru Muro, Hitomi Fujishiro, Takashi Miyamoto, Tadanao Funakoshi, Tomoyuki Mochizuki, Norimasa Iwasaki, Keiichi Akita
BACKGROUND: Although conventional Bankart repair has been the accepted procedure for traumatic anterior glenohumeral instability, the humeral avulsion of the glenohumeral ligament or an elongation of the capsule remains challenging to decide the appropriate treatment. The anatomical knowledge regarding the whole capsule of glenohumeral joint is necessary to accurately treat for the capsular disorders. The aims of the current study were to investigate the anatomical features of capsular attachment and thickness in a whole capsule of glenohumeral joint...
June 7, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29876126/a-novel-and-simple-classification-for-ligamentum-teres-pathology-based-on-joint-hypermobility
#17
REVIEW
John M O'Donnell, Manit Arora
Ligamentum teres (LT) pathology (including synovitis, partial and complete tears) is common at the time of hip arthroscopy with a reported prevalence of 51-90%. Currently, there are four published classifications of LT injuries and tears. The majority focuses on differentiating partial from full thickness tears, whereas a more recently published classification also incorporates the presumed underlying mechanism of pathology. A recent review of the current classification systems found that all are deficient for lack of inclusion of what constitutes a normal ligament, lack of inclusion of synovitis as a source of pathology and lack of inclusion of hypermobility as part of the treatment algorithm...
July 2018: Journal of Hip Preservation Surgery
https://www.readbyqxmd.com/read/29789254/prediction-of-the-irreparability-of-rotator-cuff-tears
#18
In-Bo Kim, Dong Wook Jung, Kuen Tak Suh
PURPOSE: To determine the influence of preoperative factors on reparability of rotator cuff tears (RCTs) and yield a predictive model for predicting irreparability preoperatively. METHODS: Among patients with full-thickness RCTs, the reparable group underwent arthroscopic rotator cuff repairs for reparable RCTs whereas the irreparable group underwent alternative surgical procedures for irreparable RCTs. We analyzed age, sex, chronic pseudoparalysis (CPP), mediolateral and anteroposterior tear sizes, acromiohumeral distance (AHD), tangent sign, fatty infiltration (FI) (group 1, Goutallier stage 0 or 1; and group 2, Goutallier stage 2, 3, or 4), and tendon involvement (TI) (type 1, supraspinatus; type 2, supraspinatus and subscapularis; type 3, supraspinatus and infraspinatus; and type 4, all 3 tendons)...
July 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29757693/a-rotator-cuff-tear-concomitant-with-shoulder-stiffness-is-associated-with-a-lower-retear-rate-after-1-stage-arthroscopic-surgery
#19
In-Bo Kim, Dong-Wook Jung
BACKGROUND: Few studies have reported on the radiological characteristics and repair integrity of coexistent rotator cuff tears (RCTs) and shoulder stiffness after simultaneous arthroscopic rotator cuff repair and capsular release. PURPOSE: To evaluate the radiological characteristics and repair integrity of 1-stage arthroscopic surgery of RCTs concomitant with shoulder stiffness. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Among patients who underwent arthroscopic repair of full-thickness RCTs, the stiff group underwent simultaneous capsular release for shoulder stiffness, and the nonstiff group had no stiffness...
July 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29754845/do-magnetic-resonance-imaging-and-computed-tomography-provide-equivalent-measures-of-rotator-cuff-muscle-size-in-glenohumeral-osteoarthritis
#20
Peter N Chalmers, Lindsay Beck, Irene Stertz, Alexander Aleem, Jay D Keener, Heath B Henninger, Robert Z Tashjian
BACKGROUND: Rotator cuff muscle volume is associated with outcomes after cuff repair and total shoulder arthroplasty. Muscle area on select magnetic resonance imaging (MRI) slices has been shown to be a surrogate for muscle volume. The purpose of this study was to determine whether computed tomography (CT) provides an equivalent measurement of cuff muscle area to a previously validated MRI measurement. METHODS: We included 30 patients before they were undergoing total shoulder arthroplasty with both preoperative CT and MRI scans performed within 30 days of one another at 1 institution using a consistent protocol...
October 2018: Journal of Shoulder and Elbow Surgery
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