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Lang AE, Chorneyko A, Heinrichs V. Comparing and characterizing scapular muscle activation ratios in males and females during execution of common functional movements. PeerJ 2024; 12:e17728. [PMID: 39035170 PMCID: PMC11260415 DOI: 10.7717/peerj.17728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 06/20/2024] [Indexed: 07/23/2024] Open
Abstract
Background The shoulder complex relies on scapular movement controlled by periscapular muscles for optimal arm function. However, minimal research has explored scapular muscle activation ratios during functional tasks, nor how they might be influenced by biological sex. This investigation aims to characterize how sex impacts scapular muscle activation ratios during functional tasks. Methods Twenty participants (ten females, ten males) were assessed with surface electromyography (EMG) and motion tracking during seven functional tasks. Activation ratios were calculated from normalized EMG for the three trapezius muscles and serratus anterior. Scapular angles were calculated using a YXZ Euler sequence. Two-way mixed methods ANOVAs (p < .05) were used to assess the effects of sex and humeral elevation level on ratios and angles. Results Sex-based differences were present in the Tie Apron task, with males exhibiting higher upper trapezius/lower trapezius and upper trapezius/middle trapezius ratios than females. Males also demonstrated decreased internal rotation in this task. Other tasks showcased significant sex-based differences in scapular upward rotation but not in activation ratios. Humeral elevation generally demonstrated an inverse relationship with scapular muscle activation ratios. Conclusions This study highlights sex-based differences in scapular muscle activation ratios during specific functional tasks, emphasizing the need to consider sex in analyses of shoulder movements. Normative activation ratios for functional tasks were provided, offering a foundation for future comparisons with non-normative groups. Further research is warranted to confirm and explore additional influencing factors, advancing our understanding of shoulder activation and movement in diverse populations.
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Affiliation(s)
- Angelica E. Lang
- Canadian Centre for Rural and Agricultural Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Annaka Chorneyko
- College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Vivian Heinrichs
- College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Waslen A, Friesen KB, Lang AE. Do Sex and Age Influence Scapular and Thoracohumeral Kinematics During a Functional Task Protocol? J Appl Biomech 2024; 40:29-39. [PMID: 37917968 DOI: 10.1123/jab.2023-0085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 08/14/2023] [Accepted: 08/27/2023] [Indexed: 11/04/2023]
Abstract
There is mixed evidence on the role that biological sex plays in shoulder biomechanics despite known differences in musculoskeletal disorder prevalence between males and females. Additionally, advancing age may contribute to shoulder kinematic changes. The purpose of this study was to determine if sex and age influenced scapular and thoracohumeral kinematics during a range of functional tasks. Sixty healthy participants aged 19-63 years (30 males; 30 females) completed a functional task protocol while their upper limb motion was recorded. Scapular and humeral angles were calculated and compared with multiple linear regressions to assess the interaction effects of sex and age. Shoulder kinematics were not different between sex and age groups for many of the functional tasks. However, females had lower humeral external rotation in the overhead lift task (15°, P < .001), and less scapular anterior tilt angles in the forward transfer task (6°, P < .001) than males. Age was positively associated with humeral elevation (R2 = .330, P < .001) and scapular rotation (R2 = .299, P < .001) in the Wash Axilla task. There exist some kinematic differences between sex and with advancing age for select functional tasks, which should be considered for musculoskeletal disorder development.
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Affiliation(s)
- Alexander Waslen
- College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Kenzie B Friesen
- College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Angelica E Lang
- College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
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Kijkunasathian C, Niyomkha S, Woratanarat P, Vijittrakarnrung C. The preferable shoulder position can isolate supraspinatus activity superior to the classic empty can test: an electromyographic study. BMC Musculoskelet Disord 2023; 24:255. [PMID: 37013546 PMCID: PMC10069100 DOI: 10.1186/s12891-023-06372-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 03/25/2023] [Indexed: 04/05/2023] Open
Abstract
BACKGROUND Supraspinatus (SSP) strength tests are an important shoulder examination tool for clinical evaluations of patients with a suspected SSP tear. While the empty can (EC) test is widely used to diagnose SSP dysfunction, the test cannot selectively activate SSP activity. The aim of this study was to access the electromyographic (EMG) activity within SSP, deltoid, and surrounding periscapular muscles after resisted abduction force to determine which shoulder position helps best isolate SSP from deltoid activity. METHODS A controlled laboratory EMG study was conducted. Specifically, we conducted an EMG analysis of the seven periscapular muscles (i.e., the middle deltoid, anterior deltoid, SSP, upper trapezius, posterior deltoid, infraspinatus, and pectoralis major) in 21 healthy participants, without any history of shoulder disorder, aged 29 ± 0.9 years old with a dominant-right arm. EMG activities were measured during resisted abduction force according to comprehensive shoulder positions in abduction, horizontal flexion, and humeral rotation. The supraspinatus to middle deltoid (S:D) ratio was calculated using the standardized weighted EMG and the maximum voluntary isometric contraction of the SSP and middle deltoid muscles, for each shoulder position to determine the best isolated SSP muscle strength test position. Results were analyzed with the Kruskal-Wallis test for non-normally distributed data. RESULTS Shoulder abduction, horizontal flexion, and humeral rotation significantly affected the activity of the middle deltoid, SSP, and S:D ratio (P < 0.05). The S:D ratio increased significantly in lower degrees of shoulder abduction, lower degrees of horizontal flexion, and external humeral rotation over internal rotation. The greatest S:D ratio (3.4 (0.5-9.1)) occurred at the shoulder position of 30° shoulder abduction combined with 30° horizontal flexion and external humeral rotation. Conversely, the classic EC position manifested nearly the smallest S:D ratio (0.8 (0.2-1.2)). CONCLUSION Application of the SSP strength test in the shoulder position of 30 degrees abduction, 30 degrees horizontal flexion, and external humeral rotation offers the best position to isolate the abducting activity of the SSP from that of the deltoid, which could help with diagnosis among patients with chronic shoulder pain with a suspected SSP tear condition.
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Affiliation(s)
- Chusak Kijkunasathian
- Department of Orthopedics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270, Rama VI Road, Ratchathewi District, Bangkok, 10400, Thailand
| | - Supajed Niyomkha
- Department of Orthopedics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270, Rama VI Road, Ratchathewi District, Bangkok, 10400, Thailand
| | - Patarawan Woratanarat
- Department of Orthopedics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270, Rama VI Road, Ratchathewi District, Bangkok, 10400, Thailand
| | - Chaiyanun Vijittrakarnrung
- Department of Orthopedics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, 270, Rama VI Road, Ratchathewi District, Bangkok, 10400, Thailand.
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Diplock B, Hing W, Marks D. The long head of biceps at the shoulder: a scoping review. BMC Musculoskelet Disord 2023; 24:232. [PMID: 36978047 PMCID: PMC10044783 DOI: 10.1186/s12891-023-06346-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 03/20/2023] [Indexed: 03/30/2023] Open
Abstract
BACKGROUND This review aimed to explore the available literature to update our understanding of the long head of biceps (LHB) at the shoulder. Synthesise our findings to identify emergent themes and knowledge gaps to inform future research and management directions. METHODS PubMed, Embase, Cinahl, SportDiscus, CENTRAL, and Web of Science were searched from inception to 31st December 2021. Articles were included if they referenced adult participants > 18 years of age and were written in English. RESULTS 214 articles were included in the final analysis, and results were categorised into six emergent themes: (1) Anatomy - Normal anatomical variation of the biceps from aberrant origins, third and fourth accessory heads, and an absence of the LHB tendon (LHBT) are not necessarily benign, with shoulder pain and instability a commonly reported theme. (2) Function - Bicep's role in glenohumeral elevation and stability in healthy shoulders is minimal. In contrast, LHB has a more significant role in shoulder stability and humeral head depression in subjects with rotator cuff failure or an absent LHBT. (3) Pathology - There is an association between LHB tendinopathy, rotator cuff disease, LHBT instability and occult rotator cuff tears. Early recruitment and hyperactivity of the LHB in subjects with symptomatic rotator cuff tears and instability suggest a potential compensatory role. (4) Assessment - The limited diagnostic utility of special orthopaedic tests in assessing LHBT pathology was a consistent theme. The utility of magnetic resonance imaging and ultrasound to identify full-thickness tendon tears and instability of the LHBT was moderate to high. However, the utility of clinical tests and imaging may be underestimated due to arthroscopy's limitations in fully visualising the proximal LHBT. (5) Non-Surgical Management - Ultrasound-guided injections into the biceps sheath show greater accuracy and patient outcomes than blinded injections; however, the entry of injectate into the intraarticular glenohumeral joint may have unwanted complications. (6) Surgical management - For the surgical management of biceps pathology with or without rotator cuff pathology, both biceps tenodesis and tenotomy report similar improvements in pain without any significant adverse effect on strength or function. Tenodesis favoured higher overall constant scores and a lower incidence of Popeye deformity and cramping arm pain, with tenotomy trending to be more cost and time effective. For patients with a healthy LHBT, rotator cuff repair with adjunctive tenodesis or tenotomy fails to provide additional clinical improvements compared to rotator cuff repair in isolation. CONCLUSIONS The scoping review highlights the variability of biceps anatomy, which is not necessarily benign and suggests a minimal role of the LHB in shoulder elevation and stability in healthy individuals. In contrast, individuals with rotator cuff tears experience proximal humeral migration and demonstrate hyperactivity of the LHB, suggesting a potential compensation role. The observed prevalence of LHBT pathology with rotator cuff tears is well established; however, the cause-and-effect relationship between LHBT pathology and rotator cuff disease is undetermined. The diagnostic utility of clinical tests and imaging to exclude LHBT pathology may be understated due to the limitations of arthroscopy to visualise the proximal LHBT fully. Rehabilitation programs for the LHB are understudied. Similar post-surgical clinical outcomes are observed for tenodesis and tenotomy for biceps and rotator cuff-related shoulder pain. Subjects undergoing biceps tenodesis are less likely to have cramping arm pain and a Popeye deformity than patients undergoing biceps tenotomy. The significance of routine surgical removal of the LHBT and sequelae on rotator cuff tear progression to failure and long-term shoulder function is unknown, and further research is required. PRE-REGISTRATION OSF: https://osf.io/erh9m.
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Affiliation(s)
- Brendan Diplock
- Faculty of Health Sciences & Medicine, Bond University, Gold Coast, Australia.
| | - Wayne Hing
- Faculty of Health Sciences & Medicine, Bond University, Gold Coast, Australia
| | - Darryn Marks
- Faculty of Health Sciences & Medicine, Bond University, Gold Coast, Australia
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Gillinov SM, Varady NH, Abraham PF, Meek WM, Eberlin CT, Small KM, Martin SD. Supraspinatus pathology on MRI is associated with degree of weakness on dynamic clinical strength testing. Skeletal Radiol 2022; 51:1967-1974. [PMID: 35380235 DOI: 10.1007/s00256-022-04049-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/28/2022] [Accepted: 03/28/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To analyze shoulder strength and function in patients presenting with possible supraspinatus pathology and to ascertain if these clinical findings are associated with severity of supraspinatus pathology on MRI. MATERIALS AND METHODS In total, 171 patients with presumptive rotator cuff pathology and with preserved strength on standard rotator cuff examination were prospectively recruited. Patients were subjected to bilateral shoulder strength testing employing dynamometry; this included isometric strength testing at 90° of abduction, followed by eccentric assessment of isotonic strength from full abduction through the full range of motion until the arm rested at the patient's side. We calculated absolute strength and symptomatic-to-asymptomatic arm (S/A) strength ratios. On subsequent shoulder MRI, supraspinatus pathology was designated into one of seven categories. The association between strength measurements and MRI findings was analyzed. RESULTS Increasing lesion severity on MRI was associated with both decreasing absolute strength (no tear [59.9 N] to full-thickness tear [44.2 N]; P = 0.036) and decreasing S/A strength ratios during isotonic testing (no tear [91.9%] to full-thickness tear [65.3%]; P = 0.022). In contrast, there were no significant relationships between imaging severity and absolute strength or S/A strength ratios on isometric testing. CONCLUSION Severity of supraspinatus pathology on MRI was associated with dynamic clinical function. These results validate the clinical correlation between MRI designations of supraspinatus pathology and function and suggest the need for future work to investigate utility of dynamic (versus isometric) rotator cuff physical examination maneuvers.
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Affiliation(s)
- Stephen M Gillinov
- Sports Medicine Center, Department of Orthopaedic Surgery, Massachusetts General Hospital, Mass General Brigham, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA.
| | - Nathan H Varady
- Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Paul F Abraham
- Department of Orthopaedic Surgery, Keck School of Medicine of University of Southern California, Los Angeles, CA, USA
| | - Wendy M Meek
- Sports Medicine Center, Department of Orthopaedic Surgery, Massachusetts General Hospital, Mass General Brigham, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
| | - Christopher T Eberlin
- Sports Medicine Center, Department of Orthopaedic Surgery, Massachusetts General Hospital, Mass General Brigham, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
| | - Kirstin M Small
- Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Scott D Martin
- Sports Medicine Center, Department of Orthopaedic Surgery, Massachusetts General Hospital, Mass General Brigham, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
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Gurnani N, van Deurzen DFP, Willems WJ, Janssen TWJ, Veeger DHEJ. Shoulder muscle activity after latissimus dorsi transfer in active elevation. JSES Int 2022; 6:970-977. [DOI: 10.1016/j.jseint.2022.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Novel Noninvasive Spinal Neuromodulation Strategy Facilitates Recovery of Stepping after Motor Complete Paraplegia. J Clin Med 2022; 11:jcm11133670. [PMID: 35806954 PMCID: PMC9267673 DOI: 10.3390/jcm11133670] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/03/2022] [Accepted: 06/16/2022] [Indexed: 02/04/2023] Open
Abstract
It has been suggested that neuroplasticity-promoting neuromodulation can restore sensory-motor pathways after spinal cord injury (SCI), reactivating the dormant locomotor neuronal circuitry. We introduce a neuro-rehabilitative approach that leverages locomotor training with multi-segmental spinal cord transcutaneous electrical stimulation (scTS). We hypothesized that scTS neuromodulates spinal networks, complementing the neuroplastic effects of locomotor training, result in a functional progression toward recovery of locomotion. We conducted a case-study to test this approach on a 27-year-old male classified as AIS A with chronic SCI. The training regimen included task-driven non-weight-bearing training (1 month) followed by weight-bearing training (2 months). Training was paired with multi-level continuous and phase-dependent scTS targeting function-specific motor pools. Results suggest a convergence of cross-lesional networks, improving kinematics during voluntary non-weight-bearing locomotor-like stepping. After weight-bearing training, coordination during stepping improved, suggesting an important role of afferent feedback in further improvement of voluntary control and reorganization of the sensory-motor brain-spinal connectome.
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Vajda M, Szakó L, Hegyi P, Erőss B, Görbe A, Molnár Z, Kozma K, Józsa G, Bucsi L, Schandl K. Tenodesis yields better functional results than tenotomy in long head of the biceps tendon operations-a systematic review and meta-analysis. INTERNATIONAL ORTHOPAEDICS 2022; 46:1037-1051. [PMID: 35254476 PMCID: PMC9001564 DOI: 10.1007/s00264-022-05338-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 02/01/2022] [Indexed: 12/29/2022]
Abstract
Background Pathology of the long head of the biceps tendon (LHBT) is a common disorder affecting muscle function and causing considerable pain for the patient. The literature on the two surgical treatment methods (tenotomy and tenodesis) is controversial; therefore, our aim was to compare the results of these interventions. Methods We performed a meta-analysis using the following strategy: (P) patients with LHBT pathology, (I) tenodesis, (C) tenotomy, (O) elbow flexion and forearm supination strength, pain assessed on the ten-point Visual Analog Scale (VAS), bicipital cramping pain, Constant, ASES, and SST score, Popeye deformity, and operative time. We included only randomized clinical trials. We searched five databases. During statistical analysis, odds ratios (OR) and weighted mean differences (WMD) were calculated for dichotomous and continuous outcomes, respectively, using the Bayesian method with random effect model. Results We included 11 studies in the systematic review, nine of these were eligible for the meta-analysis, containing data about 572 patients (279 in the tenodesis, 293 in the tenotomy group). Our analysis concluded that tenodesis is more beneficial considering 12-month elbow flexion strength (WMD: 3.67 kg; p = 0.006), 12-month forearm supination strength (WMD: 0.36 kg; p = 0.012), and 24-month Popeye deformity (OR: 0.19; p < 0.001), whereas tenotomy was associated with decreased 3-month pain scores on VAS (WMD: 0.99; p < 0.001). We did not find significant difference among the other outcomes. Conclusion Tenodesis yields better results in terms of biceps function and is non-inferior regarding long-term pain, while tenotomy is associated with earlier pain relief. Supplementary Information The online version contains supplementary material available at 10.1007/s00264-022-05338-9.
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Affiliation(s)
- Mátyás Vajda
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
- Saint George University Teaching Hospital of County-Fejér, Seregélyesi u. 3., 8000 Székesfehérvár, Hungary
- Department of Orthodaedics, Medical School, University of Pécs, Akác u. 1, 7632 Pécs, Hungary
| | - Lajos Szakó
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
| | - Péter Hegyi
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
- Centre for Translational Medicine, Semmelweis University, Üllői út 26, Budapest, 1085 Hungary
| | - Bálint Erőss
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
- Centre for Translational Medicine, Semmelweis University, Üllői út 26, Budapest, 1085 Hungary
| | - Anikó Görbe
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
| | - Zsolt Molnár
- Institute for Translational Medicine, Medical School, University of Pécs, Szigeti út 12, 2nd floor, 7624 Pécs, Hungary
- Department of Anaesthesiology and Intensive Therapy and Pain Management, Poznan University of Medical Sciences, 49 Przybyszewskiego St, 60-355 Poznan, Poland
| | - Kincső Kozma
- Department of Ophtalmology, Medical School, University of Pécs, Rákóczi út 2, 7623 Pécs, Hungary
| | - Gergő Józsa
- Department of Paediatrics, Surgical Division, University of Pécs, József Attila u. 7, 7623 Pécs, Hungary
| | - László Bucsi
- Saint George University Teaching Hospital of County-Fejér, Seregélyesi u. 3., 8000 Székesfehérvár, Hungary
- Department of Orthodaedics, Medical School, University of Pécs, Akác u. 1, 7632 Pécs, Hungary
| | - Károly Schandl
- Saint George University Teaching Hospital of County-Fejér, Seregélyesi u. 3., 8000 Székesfehérvár, Hungary
- Department of Orthodaedics, Medical School, University of Pécs, Akác u. 1, 7632 Pécs, Hungary
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Merlo A, Bò MC, Campanini I. Electrode Size and Placement for Surface EMG Bipolar Detection from the Brachioradialis Muscle: A Scoping Review. SENSORS 2021; 21:s21217322. [PMID: 34770627 PMCID: PMC8587451 DOI: 10.3390/s21217322] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/28/2021] [Accepted: 11/01/2021] [Indexed: 11/19/2022]
Abstract
The brachioradialis muscle (BRD) is one of the main elbow flexors and is often assessed by surface electromyography (sEMG) in physiology, clinical, sports, ergonomics, and bioengineering applications. The reliability of the sEMG measurement strongly relies on the characteristics of the detection system used, because of possible crosstalk from the surrounding forearm muscles. We conducted a scoping review of the main databases to explore available guidelines of electrode placement on BRD and to map the electrode configurations used and authors’ awareness on the issues of crosstalk. One hundred and thirty-four studies were included in the review. The crosstalk was mentioned in 29 studies, although two studies only were specifically designed to assess it. One hundred and six studies (79%) did not even address the issue by generically placing the sensors above BRD, usually choosing large disposable ECG electrodes. The analysis of the literature highlights a general lack of awareness on the issues of crosstalk and the need for adequate training in the sEMG field. Three guidelines were found, whose recommendations have been compared and summarized to promote reliability in further studies. In particular, it is crucial to use miniaturized electrodes placed on a specific area over the muscle, especially when BRD activity is recorded for clinical applications.
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Affiliation(s)
- Andrea Merlo
- LAM-Motion Analysis Laboratory, S. Sebastiano Hospital, Neuromotor and Rehabilitation Department, Azienda USL-IRCCS di Reggio Emilia, Via Circondaria 29, 42015 Correggio, Italy;
- Merlo Bioengineering, 43100 Parma, Italy;
| | | | - Isabella Campanini
- LAM-Motion Analysis Laboratory, S. Sebastiano Hospital, Neuromotor and Rehabilitation Department, Azienda USL-IRCCS di Reggio Emilia, Via Circondaria 29, 42015 Correggio, Italy;
- Correspondence:
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Umehara J, Yagi M, Hirono T, Ueda Y, Ichihashi N. Quantification of muscle coordination underlying basic shoulder movements using muscle synergy extraction. J Biomech 2021; 120:110358. [PMID: 33743396 DOI: 10.1016/j.jbiomech.2021.110358] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 01/19/2021] [Accepted: 02/22/2021] [Indexed: 11/30/2022]
Abstract
Numerous muscles around the shoulder joint are required to work in a coordinated manner, even when a basic shoulder movement is executed. Muscle synergy can be utilized as an index to determine muscle coordination. The purpose of the present study was to investigate the muscle coordination among different shoulder muscles underlying basic shoulder movements based on muscle synergy. Thirteen men performed 14 multiplanar shoulder movements; five movements were associated with elevation and lowering, while five were associated with horizontal abduction and adduction. The four additional movements were simple rotations at different positions. Muscle activity was measured from 12 muscle portions using surface electromyography. Using the dimensionality reduction technique, synergies were extracted first for each movement separately ("separate" synergies), and then for the global dataset (containing all movements; "global" synergies). The least number that provided 90% of the variance accounted for was selected as the optimal number of synergies. For each subject, approximately two separate synergies and approximately six global synergies with small residual values were extracted from the separate and global electromyography datasets, respectively. Specific patterns of these muscle synergies in each task were observed during each movement. In the cross-validation method, six global synergies explained 88.0 ± 1.3% of the global dataset. These findings indicate that muscle activities underlying basic shoulder movements are expressed as six units, and these units could be proxies for shoulder muscle coordination.
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Affiliation(s)
- Jun Umehara
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan; Center for Information and Neural Networks, National Institute of Information and Communications Technology, Osaka, Japan.
| | - Masahide Yagi
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tetsuya Hirono
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan
| | - Yasuyuki Ueda
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Rehabilitation, Nobuhara Hospital, Hyogo, Japan
| | - Noriaki Ichihashi
- Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Veen EJD, Koorevaar CT, Verdonschot KHM, Sluijter TE, de Groot T, van der Hoeven JH, Diercks RL, Stevens M. Compensatory Movement Patterns Are Based on Abnormal Activity of the Biceps Brachii and Posterior Deltoid Muscles in Patients with Symptomatic Rotator Cuff Tears. Clin Orthop Relat Res 2021; 479:378-388. [PMID: 33177479 PMCID: PMC7899608 DOI: 10.1097/corr.0000000000001555] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 10/12/2020] [Indexed: 01/31/2023]
Abstract
BACKGROUND Abnormal movement patterns due to compensatory mechanisms have been reported in patients with rotator cuff tears. The long head of the biceps tendon may especially be overactive and a source of pain and could induce abnormal muscle activation in these patients. It is still unknown why some patients with a rotator cuff tear develop complaints and others do not. QUESTIONS/PURPOSES (1) Which shoulder muscles show a different activation pattern on electromyography (EMG) while performing the Functional Impairment Test-Hand and Neck/Shoulder/Arm (FIT-HaNSA) in patients with a symptomatic rotator cuff tear compared with age-matched controls with an intact rotator cuff? (2) Which shoulder muscles are coactivated on EMG while performing the FIT-HaNSA? METHODS This comparative study included two groups of people aged 50 years and older: a group of patients with chronic symptomatic rotator cuff tears (confirmed by MRI or ultrasound with the exclusion of Patte stage 3 and massive rotator cuff tears) and a control group of volunteers without shoulder conditions. Starting January 2019, 12 patients with a chronic rotator cuff tear were consecutively recruited at the outpatient orthopaedic clinic. Eleven age-matched controls (randomly recruited by posters in the hospital) were included after assuring the absence of shoulder complaints and an intact rotator cuff on ultrasound imaging. The upper limb was examined using the FIT-HaNSA (score: 0 [worst] to 300 seconds [best]), shoulder-specific instruments, health-related quality of life, and EMG recordings of 10 shoulder girdle muscles while performing a tailored FIT-HaNSA. RESULTS EMG (normalized root mean square amplitudes) revealed hyperactivity of the posterior deltoid and biceps brachii muscles during the upward phase in patients with rotator cuff tears compared with controls (posterior deltoid: 111% ± 6% versus 102% ± 10%, mean difference -9 [95% confidence interval -17 to -1]; p = 0.03; biceps brachii: 118% ± 7% versus 111% ± 6%, mean difference -7 [95% CI -13 to 0]; p = 0.04), and there was decreased activity during the downward phase in patients with rotator cuff tears compared with controls (posterior deltoid: 89% ± 6% versus 98% ± 10%, mean difference 9 [95% CI 1 to 17]; p = 0.03; biceps brachii: 82% ± 7% versus 89% ± 6%, mean difference 7 [95% CI 0 to 14]; p = 0.03). The posterior deltoid functioned less in conjunction with the other deltoid muscles, and lower coactivation was seen in the remaining intact rotator cuff muscles in the rotator cuff tear group than in the control group. CONCLUSION Patients with a symptomatic rotator cuff tear show compensatory movement patterns based on abnormal activity of the biceps brachii and posterior deltoid muscles when compared with age-matched controls. The posterior deltoid functions less in conjunction with the other deltoid muscles, and lower coactivation was seen in the remaining intact rotator cuff muscles in the rotator cuff tear group than the control group. CLINICAL RELEVANCE This study supports the potential benefit of addressing the long head biceps tendon in the treatment of patients with a symptomatic rotator cuff tear. Moreover, clinicians might use these findings for conservative treatment; the posterior deltoid can be specifically trained to help compensate for the deficient rotator cuff.
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Affiliation(s)
- Egbert J D Veen
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Cornelis T Koorevaar
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Koen H M Verdonschot
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Tim E Sluijter
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Tom de Groot
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Johannes H van der Hoeven
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Ronald L Diercks
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Martin Stevens
- E. J. D. Veen, K. H. M. Verdonschot, T. E. Sluijter, T. de Groot, R. L. Diercks, M. Stevens, Department of Orthopedics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
- C. T. Koorevaar, Department of Orthopedic Surgery and Traumatology, Deventer Hospital, Deventer, The Netherlands
- K. H. M. Verdonschot, Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
- J. H. van der Hoeven, Department of Neurology and Neurophysiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Abraham PF, Nazal MR, Varady NH, Gillinov SM, Quinlan NJ, Alpaugh K, Martin SD. The new dynamic isotonic manipulation examination (DIME) is a highly sensitive secondary screening tool for supraspinatus full-thickness tears. J Shoulder Elbow Surg 2020; 29:2213-2220. [PMID: 32650076 DOI: 10.1016/j.jse.2020.06.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/13/2020] [Accepted: 06/22/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND Traditional shoulder physical examination (PE) tests have suboptimal sensitivity for detection of supraspinatus full-thickness tears (FTTs). Therefore, clinicians may continue to suspect FTTs in some patients with negative rotator cuff PE tests and turn to magnetic resonance imaging (MRI) for definitive diagnosis. Consequently, there is a need for a secondary screening test that can accurately rule out FTTs in these patients to better inform clinicians which patients should undergo MRI. The purpose of this study was to assess the ability of 2 new dynamic PE tests to detect supraspinatus pathology in patients for whom traditional static PE tests failed to detect pathology. METHODS We prospectively enrolled 171 patients with suspected rotator cuff pathology with negative findings on traditional rotator cuff PE, who underwent 2 new dynamic PE tests: first, measurement of angle at which the patient first reports pain on unopposed active abduction and, second, the dynamic isotonic manipulation examination (DIME). Patients then underwent shoulder magnetic resonance arthrogram. Data from the new PE maneuvers were compared with outcomes collected from magnetic resonance arthrogram reports. RESULTS Pain during DIME testing had a sensitivity of 96.3% and 92.6% and a negative predictive value of 96.2% and 94.9% in the coronal and scapular planes, respectively. DIME strength ≤86.0 N had a sensitivity of 100% and 96.3% and a negative predictive value of 100% and 95.7% in the coronal and scapular planes, respectively. Pain at ≤90° on unopposed active abduction in the coronal plane had a specificity of 100% and a positive predictive value of 100% for supraspinatus pathology of any kind (ie, tendinopathy, "fraying," or tearing). CONCLUSION DIME is highly sensitive for supraspinatus FTTs in patients with negative traditional rotator cuff PE tests for whom there is still high clinical suspicion of FTTs. Thus, this test is an excellent secondary screening tool for supraspinatus FTTs in patients for whom clinicians suspect rotator cuff pathology despite negative traditional static PE tests. Given its high sensitivity, a negative DIME test rules out supraspinatus FTT well in these patients, and can therefore better inform clinicians which patients should undergo MRI. In addition, the angle at which patients first report pain on unopposed active shoulder abduction is highly specific for supraspinatus pathology.
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Affiliation(s)
- Paul F Abraham
- Department of Orthopaedic Surgery, Sports Medicine Center, Massachusetts General Hospital, Boston, MA, USA.
| | - Mark R Nazal
- Department of Orthopaedic Surgery, Sports Medicine Center, Massachusetts General Hospital, Boston, MA, USA
| | - Nathan H Varady
- Department of Orthopaedic Surgery, Sports Medicine Center, Massachusetts General Hospital, Boston, MA, USA
| | - Stephen M Gillinov
- Department of Orthopaedic Surgery, Sports Medicine Center, Massachusetts General Hospital, Boston, MA, USA
| | - Noah J Quinlan
- Department of Orthopaedic Surgery, University of Utah, Salt Lake City, UT, USA
| | - Kyle Alpaugh
- Department of Orthopaedic Surgery, University of Massachusetts, Worcester, MA, USA
| | - Scott D Martin
- Department of Orthopaedic Surgery, Sports Medicine Center, Massachusetts General Hospital, Boston, MA, USA
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13
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Shoulder muscle activation strategies differ when lifting or lowering a load. Eur J Appl Physiol 2020; 120:2417-2429. [PMID: 32803382 DOI: 10.1007/s00421-020-04464-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 08/04/2020] [Indexed: 12/30/2022]
Abstract
PURPOSE Lowering a load could be associated with abnormal shoulder and scapular motion. We tested the hypothesis that lowering a load involves different shoulder muscle coordination strategies compared to lifting a load. METHODS EMG activity of 13 muscles was recorded in 30 healthy volunteers who lifted and lowered a 6, 12 or 18 kg box between three shelves. Kinematics, EMG levels and muscle synergies, extracted using non-negative matrix factorization, were analyzed. RESULTS We found greater muscle activity level during lowering in four muscles (+ 1-2% MVC in anterior deltoid, biceps brachii, serratus anterior and pectoralis major). The movements were performed faster during lifting (18.2 vs. 15.9 cm/s) but with similar hand paths and segment kinematics. The number of synergies was the same in both tasks. Two synergies were identified in ~ 75% of subjects, and one synergy in the others. Synergy #1 mainly activated prime movers' muscles, while synergy #2 co-activated several antagonist muscles. Synergies' structure was similar between lifting and lowering (Pearson's r ≈ 0.9 for synergy #1 and 0.7-08 for synergy #2). Synergy #2 was more activated during lowering and explained the greater activity observed in anterior deltoid, serratus anterior and pectoralis. CONCLUSION Lifting and lowering a load were associated with similar synergy structure. In 3/4 of subjects, lowering movements involved greater activation of a "multiple antagonists" synergy. The other subjects co-contracted all shoulder muscles as a unit in both conditions. These inter-individual differences should be investigated in the occurrence of shoulder musculoskeletal disorders.
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14
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Lulic-Kuryllo T, Alenabi T, McDonald AC, Kim SY, Dickerson CR. Sub-regional activation of supraspinatus and infraspinatus muscles during activities of daily living is task dependent. J Electromyogr Kinesiol 2020; 54:102450. [PMID: 32711359 DOI: 10.1016/j.jelekin.2020.102450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/10/2020] [Accepted: 07/11/2020] [Indexed: 11/18/2022] Open
Abstract
The supraspinatus and infraspinatus muscles each have multiple sub-regions that may activate differentially in activities of daily living. Awareness of these differential demands critically informs rehabilitation of rotator cuff muscle following injury, particularly if centered on recovering and strengthening the rotator cuff to perform daily tasks. This study quantified muscle activation of supraspinatus and infraspinatus sub-regions during the performance of six activities of daily living. Twenty-three participants (mean: 22.6 ± 2.6 years) completed the following tasks: opening a jar, reaching at shoulder height, overhead reaching, pouring water from a pitcher, eating with a spoon, and combing hair. Indwelling electromyography was collected from the anterior and posterior supraspinatus and superior, middle, and inferior infraspinatus. Tasks requiring high arm elevations (e.g. reaching at shoulder and overhead height) activated anterior supraspinatus between 21 and 28% MVC. The posterior supraspinatus consistently activated between 10 and 30% MVC across all tasks. All sub-regions of infraspinatus activated highly (between 18 and 25% MVC) in tasks requiring high arm elevations in flexion. These findings may be leveraged to define effective measures to increase rotator cuff function in daily tasks.
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Affiliation(s)
- Tea Lulic-Kuryllo
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Talia Alenabi
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Alison C McDonald
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada
| | - Soo Y Kim
- University of Saskatchewan, College of Medicine, School of Rehabilitation Science, Saskatoon, Saskatchewan, Canada
| | - Clark R Dickerson
- Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada.
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15
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Barra-López ME, López-de-Celis C, Pérez-Bellmunt A, Puyalto-de-Pablo P, Sánchez-Fernández JJ, Lucha-López MO. The supporting role of the teres major muscle, an additional component in glenohumeral stability? An anatomical and radiological study. Med Hypotheses 2020; 141:109728. [PMID: 32298921 DOI: 10.1016/j.mehy.2020.109728] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 03/25/2020] [Accepted: 04/08/2020] [Indexed: 10/24/2022]
Abstract
Muscle coordination plays an important role in glenohumeral stability. The rotator cuff and the long head of the biceps are considered the primary dynamic stabilizers muscles. However, the fact that a subgroup of patients with a massive tear in the rotator cuff were able to keep a normal function, should make us question this traditional view. We hypothesize that the teres major which is also a monoarticular scapulohumeral muscle, although it is not part of the conjoined tendon of the rotator cuff, can play a role in glenohumeral stability by a direct support of the humeral head generated by the particular posteroanterior location of this muscle under the humeral head and which, as far as we know, has not been written up previously. This particular effect could appear while the arm is being lifted and the humeral head could be leaning on against the teres major muscle belly underneath it. An anatomical a radiological study was carried out to substantiate our hypothesis. Two cadaver specimens were used for the anatomical study. Frist body was studied through conventional dissection. The second body was analysed through sectional anatomy. Then a radiological study was carried out using magnetic resonance imaging in a healthy male volunteer. Both anatomically and radiologically, the anteroinferior surface of the humeral head was showed firmly resting against the muscle belly of the teres major, to the point of misshaping it from 110 degrees of arm elevation with external rotation. The specific contribution of this effect to the glenohumeral stability needs to be confirmed by further studies and can help us to prevent the high incidence of glenohumeral dislocations.
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Affiliation(s)
- M E Barra-López
- Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain; Jordi Gol Institute of Research on Primary Health Care, Barcelona, Spain.
| | - C López-de-Celis
- Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain; Jordi Gol Institute of Research on Primary Health Care, Barcelona, Spain; Baix Llobregat Centre Rehabilitation Service, DAP Costa de Ponent, Catalan Institute of Health, Barcelona, Spain
| | - A Pérez-Bellmunt
- Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain
| | - P Puyalto-de-Pablo
- Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain
| | - J J Sánchez-Fernández
- Faculty of Medicine and Health Sciences, International University of Catalonia, Barcelona, Spain
| | - M O Lucha-López
- Faculty of Health Sciences, Physiotherapy Research Unit, University of Zaragoza, Zaragoza, Spain
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16
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Sahara R, Hamada J, Yoshizaki K, Endo K, Segawa D, Yamaguchi M. Kinematic Differences between Two Types of Forward Elevations of the Shoulder Joint: Flexion and Reaching Elevation. Open Orthop J 2020. [DOI: 10.2174/1874325002014010015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
Background:
Extension of the elbow joint is maintained during shoulder flexion. In contrast, the arm starts from the flexed position of the elbow joint and the joint gradually extends during reaching elevation.
Objectives:
This study aimed to compare the kinematic elements and electromyographic (EMG) activities of the rotator cuff muscles between flexion and reaching elevation.
Methods:
The study included 10 healthy young men. (average age, 21.5 ± 3.4 years), and measurements were performed on their dominant arms. A three-dimensional motion analyzer was used to record the following elements during shoulder flexion and reaching elevation: the angles of glenohumeral joint elevation and scapular upward rotation, scapulohumeral rhythm, external rotation of the humerus, and glenohumeral plane shifting from the coronal plane. The EMG activities in the supraspinatus, infraspinatus, subscapularis, and teres minor were recorded simultaneously.
Results:
The plane of reaching elevation was retained at 60° from the coronal plane. The glenohumeral planes (P < 0 .01) and the external rotation angles of the humerus below 90° of elevation (P < 0.05) were significantly different between both the motions. The EMG activities in the supraspinatus (P < .01), infraspinatus (P < 0.05), and teres minor (P < 0.01) were significantly lower while reaching elevation than those during flexion.
Conclusion:
The motion plane at 60° from the coronal plane, movement of the humeral external rotation, and EMG activities of the rotator cuff muscles were different during reaching elevation and shoulder flexion.
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17
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Rienmüller A, Maffiuletti NA, Schwyzer HK, Eggspühler A. Shoulder Muscle Strength and Neuromuscular Activation 2 Years after Reverse Shoulder Prosthesis-An Experimental Case Control Study. J Clin Med 2020; 9:jcm9020365. [PMID: 32013074 PMCID: PMC7073832 DOI: 10.3390/jcm9020365] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/24/2020] [Accepted: 01/27/2020] [Indexed: 11/17/2022] Open
Abstract
Although reverse shoulder arthroplasty (RSA) has shown successful postoperative outcomes, little is known about compensatory activation patterns of remaining shoulder muscles following RSA. The purpose of this experimental case control series was to investigate shoulder muscle strength and neuromuscular activation of deltoid and teres minor muscles 2 years after RSA. Humerus lengthening, center-of-rotation medialization, maximal voluntary strength, and electromyographic (EMG) activity were compared between the operated and the non-operated side of 13 patients (mean age: 73 years). Shoulder muscle strength was significantly lower on the operated side for external rotation (−54%), internal rotation (−20%), and adduction (−13%). Agonist deltoid EMG activity was lower on the operated side for shoulder flexion, extension, and internal and external rotation (p < 0.05). Antagonist deltoid coactivation was higher on the operated side for external rotation (p < 0.001). Large correlation coefficients were observed between shoulder adductor strength asymmetry and both center-of-rotation medialization (r = −0.73) and humerus lengthening (r = 0.71). Shoulder abduction strength and neuromuscular activation were well preserved 2 years after RSA, while persistent strength and activation deficits were observed for shoulder adduction and internal and external rotation. Additional studies are required to elucidate shoulder neuromuscular activation patterns before and after RSA to support decision making for surgical, implant design, and rehabilitation choices.
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Affiliation(s)
- Anna Rienmüller
- Department of Orthopedic and Trauma Surgery, Medical University Vienna, AT-1090 Vienna, Austria
- Correspondence:
| | | | - Hans-Kaspar Schwyzer
- Department of Orthopedic Surgery, Schulthess Clinic, CH-8008 Zurich, Switzerland;
| | - Andreas Eggspühler
- Department of Neurology, Schulthess Clinic, CH-8008 Zurich, Switzerland;
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McGee S, Sipos T, Allin T, Chen C, Greco A, Bobos P, MacDermid J. Systematic review of the measurement properties of performance-based functional tests in patients with neck disorders. BMJ Open 2019; 9:e031242. [PMID: 31767589 PMCID: PMC6886974 DOI: 10.1136/bmjopen-2019-031242] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES The purpose of this systematic review is to identify and synthesise studies evaluating performance-based functional outcome measures designed to evaluate the functional abilities of patients with neck pain. DESIGN Systematic review. DATA SOURCES A literature search using PubMed, Scopus, CINAHL, EMBASE, COCHRANE, Google Scholar and a citation mapping strategy was conducted until July 2019. ELIGIBILITY CRITERIA More than half of the study's patient population had neck pain or a musculoskeletal neck disorder and completed a functional-based test. Clinimetric properties of at least one performance-based functional tests were reported. Both traumatic and non-traumatic origins of neck pain were considered. DATA EXTRACTION AND SYNTHESIS Relevant data were then extracted from selected articles using an extraction guide. Selected articles were appraised using the Quality Appraisal for Clinical Measurement Research Reports Evaluation Form (QACMRR). RESULTS The search obtained 12 articles which reported on four outcome measures (functional capacity evaluations (FCE), Baltimore Therapeutic Equipment Work Simulator II (BTEWS II), Functional Impairment Test-Hand and Neck/Shoulder/Arm (FIT-HaNSA)) and a physiotherapy test package, to assess the functional abilities in patients with mechanical neck pain. Of the selected papers: one reports content validity, five construct validity, four reliability, one sensitivity to change and one both reliability and construct validity. QACMRR scores ranged from 68% to 95%. CONCLUSIONS This review found very good quality evidence that the FIT-HaNSA has excellent inter and intra-rater reliability and very weak to weak convergent validity. Excellent quality evidence of fair test-retest reliability, weak convergent validity and very weak known groups validity for the BTEWS II test was found. Good to excellent quality evidence exists that an FCE battery has poor to excellent reliability and very weak to strong validity. Good to excellent quality of weak to strong validity and trivial to strong effect sizes were found for a physiotherapy test package. PROSPERO REGISTRATION NUMBER CRD42018112358.
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Affiliation(s)
- Steven McGee
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
| | - Taylor Sipos
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
| | - Thomas Allin
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
| | - Celia Chen
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
| | - Alexandra Greco
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
| | - Pavlos Bobos
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
- Western's Bone and Joint Intitute, Western University, London, Ontario, Canada
- Dalla Lana School of Public Health, Institute of Health Policy Management and Evaluation, Department of Clinical Epidemiology and Health Care Research, University of Toronto, Toronto, Ontario, Canada
| | - Joy MacDermid
- School of Physical Therapy, Health and Rehabilitation Sciences, Western University, London, Ontario, Canada
- Western's Bone and Joint Intitute, Western University, London, Ontario, Canada
- School of Rehabilitation Science, McMaster University, Hamilton, Ontario, Canada
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19
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Yörükoğlu AÇ, Şavkın R, Büker N, Alsayani KYA. Is there a relation between rotator cuff injury and core stability? J Back Musculoskelet Rehabil 2019; 32:445-452. [PMID: 30475749 DOI: 10.3233/bmr-170962] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Strong core stabilization not only minimizes the load on the vertebral column, but also improves strength and endurance of peripheral joints, and enables the energy transfer to distal segments. Despite the current interest surrounding core stability, none of the studies investigated the effect of core stability on the formation of rotator cuff tear or healing after repair. OBJECTIVE To determine the relationship between core stability and upper extremity functional performance in patients who underwent rotator cuff repair surgery and to compare those with healthy subjects of similar age. METHODS Patients who underwent rotator cuff repair (RC repair group, n= 58 patient) and healthy subjects of the similar age group (control group, n= 114) were included in the study. The mean age was 55.03 ± 9.84 years in the RC repair group and 52.71 ± 6.31 years in the control group. The RC repair group took standardized rehabilitation. The rehabilitation program did not include core strength and stability exercise. Core endurance was assessed with Flexor Endurance, Prone Bridge and Supine bridge test. Disabilities of the Arm, Shoulder and Hand (DASH), Short Form-36 (SF-36) and the Close Kinetic Chain Upper Extremity Stability (CKCUES) test were used to evaluate the upper extremity functional performance. RESULTS The core endurance (prone and supine bridge test) of the control group was statistically significantly better than the RC repair group (p⩽ 0.005). The DASH-T, SF-36 and CKCUES scores of the control group were also statistically significantly better. CONCLUSION The neuromuscular system should be considered as a whole, and addition of the core stabilization exercises to an effective rehabilitation program after RC repair surgery may be beneficial.
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Affiliation(s)
- Ali Çağdaş Yörükoğlu
- Orthopedics and Traumatology Department, Medical Faculty, Pamukkale University, Denizli, Turkey
| | - Raziye Şavkın
- School of Physical Therapy and Rehabilitation, Pamukkale University, Denizli, Turkey
| | - Nihal Büker
- School of Physical Therapy and Rehabilitation, Pamukkale University, Denizli, Turkey
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Patterns of muscle coordination during dynamic glenohumeral joint elevation: An EMG study. PLoS One 2019; 14:e0211800. [PMID: 30735521 PMCID: PMC6368381 DOI: 10.1371/journal.pone.0211800] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 01/21/2019] [Indexed: 11/19/2022] Open
Abstract
The shoulder relies heavily on coordinated muscle activity for normal function owing to its limited osseous constraint. However, previous studies have failed to examine the sophisticated interrelationship between all muscles. It is essential for these normal relationships to be defined as a basis for understanding pathology. Therefore, the primary aim of the study was to investigate shoulder inter-muscular coordination during different planes of shoulder elevation. Twenty healthy subjects were included. Electromyography was recorded from 14 shoulder girdle muscles as subjects performed shoulder flexion, scapula plane elevation, abduction and extension. Cross-correlation was used to examine the coordination between different muscles and muscle groups. Significantly higher coordination existed between the rotator cuff and deltoid muscle groups during the initial (Pearson Correlation Coefficient (PCC) = 0.79) and final (PCC = 0.74) stages of shoulder elevation compared to the mid-range (PCC = 0.34) (p = 0.020–0.035). Coordination between the deltoid and a functional adducting group comprising the latissimus dorsi and teres major was particularly high (PCC = 0.89) during early shoulder elevation. The destabilising force of the deltoid, during the initial stage of shoulder elevation, is balanced by the coordinated activity of the rotator cuff, latissimus dorsi and teres major. Stability requirements are lower during the mid-range of elevation. At the end-range of movement the demand for muscular stability again increases and higher coordination is seen between the deltoid and rotator cuff muscle groups. It is proposed that by appreciating the sophistication of normal shoulder function targeted evidence-based rehabilitation strategies for conditions such as subacromial impingement syndrome or shoulder instability can be developed.
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Blache Y, Begon M, Michaud B, Desmoulins L, Allard P, Dal Maso F. Muscle function in glenohumeral joint stability during lifting task. PLoS One 2017; 12:e0189406. [PMID: 29244838 PMCID: PMC5731701 DOI: 10.1371/journal.pone.0189406] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 11/26/2017] [Indexed: 11/23/2022] Open
Abstract
Ensuring glenohumeral stability during repetitive lifting tasks is a key factor to reduce the risk of shoulder injuries. Nevertheless, the literature reveals some lack concerning the assessment of the muscles that ensure glenohumeral stability during specific lifting tasks. Therefore, the purpose of this study was to assess the stabilization function of shoulder muscles during a lifting task. Kinematics and muscle electromyograms (n = 9) were recorded from 13 healthy adults during a bi-manual lifting task performed from the hip to the shoulder level. A generic upper-limb OpenSim model was implemented to simulate glenohumeral stability and instability by performing static optimizations with and without glenohumeral stability constraints. This procedure enabled to compute the level of shoulder muscle activity and forces in the two conditions. Without the stability constraint, the simulated movement was unstable during 74%±16% of the time. The force of the supraspinatus was significantly increased of 107% (p<0.002) when the glenohumeral stability constraint was implemented. The increased supraspinatus force led to greater compressive force (p<0.001) and smaller shear force (p<0.001), which contributed to improved glenohumeral stability. It was concluded that the supraspinatus may be the main contributor to glenohumeral stability during lifting task.
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Affiliation(s)
- Yoann Blache
- Laboratoire Interuniversitaire de Biologie de la Motricité, Université Lyon 1, Université de Lyon, Lyon, France
- * E-mail:
| | - Mickaël Begon
- Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Québec, Canada
| | - Benjamin Michaud
- Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Québec, Canada
| | - Landry Desmoulins
- Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Québec, Canada
| | - Paul Allard
- Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Québec, Canada
| | - Fabien Dal Maso
- Laboratoire de Simulation et Modélisation du Mouvement, Département de Kinésiologie, Université de Montréal, Québec, Canada
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Analysis neuromuscular activity during front crawl with and without a snorkel. Sci Sports 2017. [DOI: 10.1016/j.scispo.2016.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Yian EH, Sodl JF, Dionysian E, Schneeberger AG. Anterior deltoid reeducation for irreparable rotator cuff tears revisited. J Shoulder Elbow Surg 2017; 26:1562-1565. [PMID: 28483431 DOI: 10.1016/j.jse.2017.03.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Revised: 02/23/2017] [Accepted: 03/07/2017] [Indexed: 02/01/2023]
Abstract
BACKGROUND A previous study introduced a method of conservative treatment of irreparable rotator cuff tears (RCTs) using a rehabilitation program (anterior deltoid reeducation [ADR]). The purposes of this study were to present our experience with ADR and to compare our results with those of the previous study. METHODS Thirty consecutive elderly patients with irreparable RCTs were prospectively enrolled and taught how to perform the home-based ADR program for a period of 3 months. Clinical and radiographic evaluations were determined at the first visit. Clinical follow-up was available after 9 and 24 months. Failure of the ADR program was defined as abandonment of the ADR program because of pain and/or a patient's decision to undergo surgery at any time or a less than 20-point improvement in the American Shoulder and Elbow Surgeons score at last follow-up. RESULTS Of the 30 patients, 9 did not complete the 3-month ADR program because of pain. Of the 21 patients who completed the ADR program, 3 were not satisfied with the outcome and went on to undergo surgery. Eighteen of the 30 patients completed the program and had a follow-up at 24 months. Among these 18 cases, there were significant mean improvements between pre-ADR and follow-up outcome scores among all variables (P < .005). However, 6 of these 18 patients did not have an improvement in the American Shoulder and Elbow Surgeons score by at least 20 points. Overall, the ADR program had a success rate of only 40%. CONCLUSION A 3-month ADR program had limited success to treat irreparable RCTs. We could not reproduce the high rate of satisfactory results of 82% found in a previous study.
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Affiliation(s)
- Edward H Yian
- Department of Orthopaedics, Southern California Permanent Medical Group, Anaheim, CA, USA
| | - Jeffrey F Sodl
- Department of Orthopaedics, Southern California Permanent Medical Group, Anaheim, CA, USA
| | - Emil Dionysian
- Department of Orthopaedics, Southern California Permanent Medical Group, Anaheim, CA, USA
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Fritz JM, Inawat RR, Slavens BA, McGuire JR, Ziegler DW, Tarima SS, Grindel SI, Harris GF. Assessment of Kinematics and Electromyography Following Arthroscopic Single-Tendon Rotator Cuff Repair. PM R 2016; 9:464-476. [PMID: 27639653 DOI: 10.1016/j.pmrj.2016.08.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 07/15/2016] [Accepted: 08/29/2016] [Indexed: 12/18/2022]
Abstract
BACKGROUND The increasing demand for rotator cuff (RC) repair patients to return to work as soon as they are physically able has led to exploration of when this is feasible. Current guidelines from our orthopedic surgery clinic recommend a return to work at 9 weeks postoperation. To more fully define capacity to return to work, the current study was conducted using a unique series of quantitative tools. To date, no study has combined 3-dimensional (3D) motion analysis with electromyography (EMG) assessment during activities of daily living (ADLs), including desk tasks, and commonly prescribed rehabilitation exercise. OBJECTIVE To apply a quantitative, validated upper extremity model to assess the kinematics and muscle activity of the shoulder following repair of the supraspinatus RC tendon compared to that in healthy shoulders. DESIGN A prospective, cross-sectional comparison study. SETTING All participants were evaluated during a single session at the Medical College of Wisconsin Department of Orthopaedic Surgery's Motion Analysis Laboratory. PARTICIPANTS Ten participants who were 9-12 weeks post-operative repair of a supraspinatus RC tendon tear and 10 participants with healthy shoulders (HS) were evaluated. METHODS All participants were evaluated with 3D motion analysis using a validated upper extremity model and synchronized EMG. Data from the 2 groups were compared using multivariate Hotelling T2 tests with post hoc analyses based on Welch t-tests. MAIN OUTCOME MEASUREMENTS Participants' thoracic and thoracohumeral joint kinematics, temporal-spatial parameters, and RC muscle activity were measured by applying a quantitative upper extremity model during 10 ADLs and 3 rehabilitation exercises. These included tasks of hair combing, drinking, writing, computer mouse use, typing, calling, reaching to back pocket, pushing a door open, pulling a door closed, external rotation, internal rotation, and rowing. RESULTS There were significant differences of the thoracohumeral joint motion in only a few of the tested tasks: comb maximal flexion angle (P = .004), pull door internal/external rotation range of motion (P = .020), reach abduction/adduction range of motion (P = .001), reach flexion/extension range of motion (P = .001), reach extension minimal angle (P = .025), active external rotation maximal angle (P = .012), and active external rotation minimal angle (P = .004). The thorax showed significantly different kinematics of maximal flexion angle during the call (P = .011), mouse (P = .007), and drink tasks (P = .005) between the 2 groups. The EMG data analysis showed significantly increased subscapularis activity in the RC repair group during active external rotation. CONCLUSIONS Although limited abduction was expected due to repair of the supraspinatus tendon, only a single ADL (reaching to back pocket) had a significantly reduced abduction range of motion. Thoracic motion was shown to be used as a compensatory strategy during seated ADLs. Less flexion of the thorax may create passive shoulder flexion at the thoracohumeral joint in efforts to avoid active flexion. The RC repair group participants were able to accomplish the ADLs within the same time frame and through thoracohumeral joint kinematics similar to those in the healthy shoulder group participants. In summary, this study presents a quantification of the effects of RC repair and rehabilitation on the ability to perform ADLs. It may also point to a need for increased rehabilitation focus on either regaining external rotation strength or range of motion following RC repair to enhance recovery and return to the workforce. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Jessica M Fritz
- Orthopaedic & Rehabilitation Engineering Center, Marquette University/The Medical College of Wisconsin, 1515 W Wisconsin Ave, Olin 301, Milwaukee, WI 53233(∗).
| | - Ryan R Inawat
- Orthopaedic & Rehabilitation Engineering Center, Marquette University/The Medical College of Wisconsin, Milwaukee, WI(†)
| | - Brooke A Slavens
- Orthopaedic & Rehabilitation Engineering Center, Marquette University/The Medical College of Wisconsin, Milwaukee, WI; Department of Occupational Science & Technology, University of Wisconsin-Milwaukee, Milwaukee, WI(‡)
| | - John R McGuire
- Department of Physical Medicine & Rehabilitation, The Medical College of Wisconsin, Milwaukee, WI(§)
| | | | - Sergey S Tarima
- Division of Biostatistics, The Medical College of Wisconsin, Milwaukee, WI(¶)
| | - Steven I Grindel
- Department of Orthopaedic Surgery, The Medical College of Wisconsin, Milwaukee, WI(#)
| | - Gerald F Harris
- Orthopaedic & Rehabilitation Engineering Center, Marquette University/The Medical College of Wisconsin, Milwaukee, WI; Shriners Hospitals for Children, Chicago, IL(∗∗)
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Pierrynowski M, McPhee C, P Mehta S, C MacDermid J, Gross A. Intra and Inter-Rater Reliability and Convergent Validity of FIT-HaNSA in Individuals with Grade П Whiplash Associated Disorder. Open Orthop J 2016; 10:179-89. [PMID: 27350797 PMCID: PMC4906145 DOI: 10.2174/1874325001610010179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 02/25/2016] [Accepted: 02/28/2016] [Indexed: 11/23/2022] Open
Abstract
Background: Whiplash-Associated Disorders (WAD) are common following a motor vehicle accident. The Functional Impairment Test - Hand, and Neck/Shoulder/Arm (FIT-HaNSA) assesses upper extremity physical performance. It has been validated in patients with shoulder pathology but not in those with WAD. Objectives: Establish the Intra and inter-rater reliability and the known-group and construct validity of the FIT-HaNSA in patients with Grade II WAD (WAD2). Methods: Twenty-five patients with WAD2 and 41 healthy controls were recruited. Numeric Pain Rating Scale (NPRS), Neck Disability Index (NDI), Disabilities of the Arm, Shoulder and Hand (DASH), cervical range of motion (CROM), and FIT-HaNSA were completed at two sessions conducted 2 to 7 days apart by two raters. Intraclass correlation coefficients (ICC) were used to describe Intra and inter-rater reliability. Spearman rank correlation coefficients (ρ) were used to quantify the associations between scores of the FIT-HaNSA and other measures in the WAD2 group (convergent construct validity). Results: The Intra and inter-ICCs for the FIT-HaNSA scores ranged from 0.88 to 0.89 in the control group and 0.78 to 0.85 in the WAD2 group. Statistically significant differences in FIT-HaNSA performance between the two groups suggested known group construct validity (P < 0.001). The correlations between the NPRS, NDI, DASH, CROM and FIT-HaNSA were generally poor (ρ < 0.4). Conclusion: The study results indicate that the total FIT-HaNSA score has good Intra and inter-rater reliability and the construct validity in WAD2 and healthy controls.
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Affiliation(s)
- Michael Pierrynowski
- School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Colleen McPhee
- Stonechurch Family Health Centre, Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Saurabh P Mehta
- School of Physical Therapy, Marshall University, Huntington, West Virginia, United States
| | - Joy C MacDermid
- School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada; School of Physical Therapy, University of Western Ontario, London, Ontario, Canada
| | - Anita Gross
- School of Rehabilitation Sciences, McMaster University, Hamilton, Ontario, Canada
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Shoulder Electromyography Measurements During Activities of Daily Living and Routine Rehabilitation Exercises. J Orthop Sports Phys Ther 2016; 46:375-83. [PMID: 27049599 DOI: 10.2519/jospt.2016.6090] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Study Design Controlled laboratory study. Background The activity of the rotator cuff muscles has not previously been measured with indwelling electromyography (EMG) comparing ambulation and other movements. Knowledge of the relative contribution of these muscles during various tasks may help to guide rehabilitation progression. Objective To measure activity of the rotator cuff muscles and other shoulder muscles during normal ambulation, shirt and sling donning and doffing, and rehabilitation tasks commonly performed after rotator cuff surgery. Methods In 28 volunteers (15 men, 13 women; mean age, 32.2 years), indwelling EMG activity was measured in the supraspinatus, infraspinatus, teres minor, and subscapularis muscles during various tasks; and surface EMG activity was measured in the middle deltoid, biceps, and upper trapezius muscles. Results Using median EMG activity, in general, donning and doffing a shirt or sling recruited the rotator cuff muscles more than the other 7 tasks tested. Self-ranging motion using pulleys, especially in the scapular plane, was also consistently associated with greater recruitment of the shoulder muscles. Pendulum exercises, passive range of motion by a physical therapist, and self-ranging motion with a dowel recruited the shoulder muscles to a lesser extent. Conclusion Our results demonstrate that rehabilitation tasks such as pendulum exercises, passive range of motion by a physical therapist, and self-ranging motion with a dowel show low EMG activity, whereas pulleys in the sagittal plane and scapular plane show greater activity. Scapular plane activity was consistently higher than sagittal plane activity. Of all the tasks assessed, ambulation without a sling and donning and doffing a sling and a shirt consistently showed the highest activity. J Orthop Sports Phys Ther 2016;46(5):375-383. Epub 6 Apr 2016. doi:10.2519/jospt.2016.6090.
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Vidt ME, Santago AC, Marsh AP, Hegedus EJ, Tuohy CJ, Poehling GG, Freehill MT, Miller ME, Saul KR. The effects of a rotator cuff tear on activities of daily living in older adults: A kinematic analysis. J Biomech 2016; 49:611-7. [PMID: 26879327 DOI: 10.1016/j.jbiomech.2016.01.029] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 01/08/2016] [Accepted: 01/28/2016] [Indexed: 01/29/2023]
Abstract
Rotator cuff tears (RCT) in older individuals may compound age-associated physiological changes and impact their ability to perform daily functional tasks. Our objective was to quantify thoracohumeral kinematics for functional tasks in 18 older adults (mean age=63.3±2.2), and compare findings from nine with a RCT to nine matched controls. Motion capture was used to record kinematics for 7 tasks (axilla wash, forward reach, functional pull, hair comb, perineal care, upward reach to 90°, upward reach to 105°) spanning the upper limb workspace. Maximum and minimum joint angles and motion excursion for the three thoracohumeral degrees of freedom (elevation plane, elevation, axial rotation) were identified for each task and compared between groups. The RCT group used greater minimum elevation angles for axilla wash and functional pull (p≤0.0124) and a smaller motion excursion for functional pull (p=0.0032) compared to the control group. The RCT group also used a more internally rotated maximum axial rotation angle than controls for functional reach, functional pull, hair comb, and upward reach to 105° (p≤0.0494). The most differences between groups were observed for axial rotation, with the RCT group using greater internal rotation to complete functional tasks, and significant differences between groups were identified for all three thoracohumeral degrees of freedom for functional pull. We conclude that older adults with RCT used more internal rotation to perform functional tasks than controls. The kinematic differences identified in this study may have consequences for progression of shoulder damage and further functional impairment in older adults with RCT.
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Affiliation(s)
- Meghan E Vidt
- Exercise Science and Health Promotion, Arizona State University, Phoenix, AZ, USA.
| | - Anthony C Santago
- Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Winston-Salem, NC, USA; Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA
| | - Anthony P Marsh
- Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC, USA
| | - Eric J Hegedus
- Department of Physical Therapy, High Point University, High Point, NC, USA
| | - Christopher J Tuohy
- Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Gary G Poehling
- Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Michael T Freehill
- Department of Orthopaedic Surgery, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Michael E Miller
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Katherine R Saul
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA
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Chalmers PN, Cvetanovich GL, Kupfer N, Wimmer MA, Verma NN, Cole BJ, Romeo AA, Nicholson GP. The champagne toast position isolates the supraspinatus better than the Jobe test: an electromyographic study of shoulder physical examination tests. J Shoulder Elbow Surg 2016; 25:322-9. [PMID: 26443105 DOI: 10.1016/j.jse.2015.07.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/25/2015] [Accepted: 07/30/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND While Jobe's test is widely used, it does not isolate supraspinatus activity. Our purpose was to examine the electromyographic (EMG) activity within the supraspinatus and deltoid with resisted abduction to determine the shoulder position that best isolates the activity of the supraspinatus. METHODS We performed EMG analysis of the supraspinatus, anterior head of the deltoid, and middle head of the deltoid in 10 normal volunteers. We measured EMG activity during resisted shoulder abduction in the scapular plane to both manual resistance and a standardized load in varying degrees of abduction and rotation. To determine which position best isolates supraspinatus activity, the ratio of supraspinatus to deltoid activity (S:D) was calculated for each position. Results were analyzed with a repeated-measures analysis of variance with Bonferroni correction. The posterior deltoid was excluded as it serves mostly to extend and externally rotate. RESULTS Our study confirmed Jobe's findings of maximal supraspinatus activity at 90° of abduction. However, decreasing abduction significantly increased S:D for both resisted manual testing and testing against a standardized load (P = .002 and .001, respectively). The greatest S:D ratio (4.6 ± 3.4 for standardized load testing) was seen at the "champagne toast" position, i.e., 30° of abduction, mild external rotation, 30° of flexion, and 90° of elbow flexion. The smallest ratio (0.8 ± 0.6) was seen at Jobe's position. CONCLUSIONS Testing of abduction strength in the champagne toast position, i.e., 30° of abduction, mild external rotation, and 30° of flexion, better isolates the activity of the supraspinatus from the deltoid than Jobe's "empty can" position.
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Affiliation(s)
- Peter N Chalmers
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA.
| | | | - Noam Kupfer
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Markus A Wimmer
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Nikhil N Verma
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Brian J Cole
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Anthony A Romeo
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Gregory P Nicholson
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
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Outcome Evaluation in Tendinopathy: Foundations of Assessment and a Summary of Selected Measures. J Orthop Sports Phys Ther 2015; 45:950-64. [PMID: 26471855 DOI: 10.2519/jospt.2015.6054] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Synopsis Clinical measurement studies that address outcome evaluation for patients with tendinopathy should consider conceptual, clinical, practical, and measurement issues to guide the selection of valid measures. Clinical outcomes reported in research studies can provide benchmarks that assist with interpretation of scores during clinical decision making. Given the pathophysiology and functional impacts of tendinopathy, there is a need for outcome measures that assess physical impairments, activity performance, and patient-reported symptoms and function. Tendinopathy-specific patient-reported outcome measures have been shown to be superior to more generic tools for some conditions, such as lateral epicondyle tendinopathy (Patient-Rated Tennis Elbow Evaluation) and Achilles tendinopathy (Victorian Institute of Sport Assessment-Achilles), whereas both generic shoulder outcome measures and disease-specific measures perform similarly in individuals with rotator cuff tendinopathy. A patient-reported outcome measure that captures pain and limitation in function should be fundamental to outcome evaluation in patients with tendinopathy. The current measurement literature does not yet provide comprehensive empirical data to define optimal outcome measures for all types of tendinopathy. This article reviews concepts, instruments, and measurement properties that should provide clinicians with a foundation for assessment of condition severity and treatment outcomes in patients with tendinopathy. J Orthop Sports Phys Ther 2015;45(11):950-964. Epub 15 Oct 2015. doi:10.2519/jospt.2015.6054.
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Castillo-Lozano R, Cuesta-Vargas A. Analysis of cervical and shoulder neuromuscular activity during adapted swimming with and without a snorkel: Implications for rehabilitation. Sci Sports 2015. [DOI: 10.1016/j.scispo.2015.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Heuberer P, Kranzl A, Laky B, Anderl W, Wurnig C. Electromyographic analysis: shoulder muscle activity revisited. Arch Orthop Trauma Surg 2015; 135:549-63. [PMID: 25720847 DOI: 10.1007/s00402-015-2180-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Restoring optimal strength and biomechanics of a pathologic shoulder knowledge of activity patterns of healthy glenohumeral muscles is mandatory. Yet, data on normal shoulder muscle activity are not always conclusive. The study was undertaken (a) to evaluate muscle activity patterns in the healthy shoulder using surface and fine-wire electromyography (EMG), and (b) to assess method's suitability in the clinical setting especially regarding painfulness and practicability. MATERIALS AND METHODS Surface and fine-wire EMG was performed on 11 healthy subjects (2f/9 m, Ø age 28 years) to assess 14 muscles including rotator cuff muscles during 8 planar standardised shoulder movements (abduction, forward flexion, internal and external rotation in neutral, 45° and 90° abduction). Pain was assessed using the visual analogue scale before testing, after inserting the fine-wire electrodes, after maximal voluntary contraction, before and after exercises, and after electrode removal. RESULTS The most important finding regarding EMG activity patterns in the healthy shoulder was that the subscapularis activity was found to play a major role in abduction and forward flexion. Furthermore, this study was able to show that EMG measurements, especially fine-wire EMG, is prone to high failure rates (up to 32%); however, pain was not a limiting factor. CONCLUSION The present study (1) revealed a new insight, especially finding the subscapularis activity playing a major role in abduction and forward flexion of the healthy shoulder; and (2) motion analysis system and the use of fine-wire electrodes were prone to failure; however, pain was not a limiting factor. LEVEL OF EVIDENCE Basic Science, Electrodiagnostic Study.
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Affiliation(s)
- Philipp Heuberer
- Department of Orthopaedics, St. Vincent Hospital Vienna, Stumpergasse 13, 1060, Vienna, Austria,
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Do surface electrode recordings validly represent latissimus dorsi activation patterns during shoulder tasks? J Electromyogr Kinesiol 2015; 25:8-13. [DOI: 10.1016/j.jelekin.2014.10.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 09/24/2014] [Accepted: 10/17/2014] [Indexed: 11/22/2022] Open
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Chalmers PN, Trombley R, Cip J, Monson B, Forsythe B, Nicholson GP, Bush-Joseph CA, Cole BJ, Wimmer MA, Romeo AA, Verma NN. Postoperative restoration of upper extremity motion and neuromuscular control during the overhand pitch: evaluation of tenodesis and repair for superior labral anterior-posterior tears. Am J Sports Med 2014; 42:2825-36. [PMID: 25326013 DOI: 10.1177/0363546514551924] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Superior labral anterior-posterior (SLAP) tears are a common cause of shoulder pain and dysfunction in overhand throwers. Treatment outcomes remain unpredictable, with a large percentage of athletes unable to return to sport. There is considerable debate about the optimal treatment between debridement, repair, and tenodesis. HYPOTHESIS Labral repair more closely restores neuromuscular control and motion during the overhand pitch than tenodesis of the long head of the biceps. STUDY DESIGN Controlled laboratory study. METHODS Eighteen pitchers, including 7 uninjured controls, 6 players pitching after SLAP repair, and 5 players pitching after subpectoral biceps tenodesis (BT), underwent simultaneous surface electromyographic measurement at 1500 Hz and motion analysis at 120 Hz with a 14-camera markerless motion analysis system and high-speed video (120 Hz) to confirm accurate motion tracking. Patients had undergone surgery at least 1 year previously and had returned to pitching with a painless shoulder. RESULTS No significant differences were observed in the long head of the biceps muscle, short head of the biceps muscle, deltoid, infraspinatus, or latissimus activity between controls, patients after SLAP repair, and patients after BT. The variability from pitch to pitch for each study participant was similar between groups. Based on visual inspection of the activity time plots, BT appeared to more closely restore the normal pattern of muscular activation within the long head of the biceps muscle than did SLAP repair. There were no significant differences between controls and postoperative patients in the majority of pitching kinematics; however, pitchers after SLAP repair showed significantly altered patterns of thoracic rotation (P = .034) compared with controls and were significantly less likely to fall into previously published normal values for lead knee flexion at front foot contact (P = .019). CONCLUSION While both BT and SLAP repair can restore physiologic neuromuscular control, pitchers who undergo SLAP repair may exhibit altered patterns of thoracic rotation when compared with controls and pitchers who undergo BT. CLINICAL RELEVANCE While both tenodesis and SLAP repair can restore physiologic neuromuscular control, SLAP repair may alter pitching biomechanics.
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Affiliation(s)
- Peter N Chalmers
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Robert Trombley
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Johannes Cip
- Department of Orthopaedic Surgery, Academic Teaching Hospital Landeskrankenhaus, Feldkirch, Austria
| | - Brett Monson
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Brian Forsythe
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Gregory P Nicholson
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Charles A Bush-Joseph
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Brian J Cole
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Markus A Wimmer
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Anthony A Romeo
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Nikhil N Verma
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
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Rosso C, Mueller AM, McKenzie B, Entezari V, Cereatti A, Della Croce U, Ramappa AJ, Nazarian A, DeAngelis JP. Bulk effect of the deltoid muscle on the glenohumeral joint. J Exp Orthop 2014; 1:14. [PMID: 26914759 PMCID: PMC4546007 DOI: 10.1186/s40634-014-0014-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 08/31/2014] [Indexed: 11/10/2022] Open
Abstract
Background There remains controversy on the role of the deltoid on glenohumeral translations during basic and pitching motions. We thus studied the passive effect of the deltoid on the deltoid glenohumeral joint center (GHJC). Methods Six shoulders were tested using an automated mechanical system. A baseline motion pattern of the intact specimen was contrasted with glenohumeral translation after removal of the deltoid. Each condition was evaluated in abduction (ABD) and an abbreviated throwing motion (ATM) using retro-reflective, bone-embedded markers. The absolute trajectory and the area under the curve (AUC) for each motion were calculated and glenohumeral kinematics with respect to the GH translation were compared. Results The removal of the deltoid resulted in significant changes of the GH translation. During 30-60° of ABD, it resulted in a superior and more anterior GH translation, while in the 60-90° segment in a more inferior and medial GH translation. During 90-120°, the GH translation was medialized. In the pitching motion from maximum external rotation to 90° of external rotation (ER), the removal of the deltoid resulted in a more superior, anterior and lateral GH translation. Thus limits anterior translation in the abduction-external rotation position. In the remaining segments (90-80° and 80-45° of ER), it resulted in a lateralization of the GH translation. Conclusions Modelling the throwing shoulder, the deltoid has a significant influence on glenohumeral motion. Athletes with deltoid dysfunction and limited range of motion are at risk for injury due to the resulting change in their throwing mechanics.
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Affiliation(s)
- Claudio Rosso
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA. .,Orthopaedic Department, University Hospital Basel and University of Basel, Basel, Switzerland. .,Altius Swiss Sportsmed Center, Rheinfelden, Switzerland.
| | - Andreas M Mueller
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA. .,Orthopaedic Department, University Hospital Basel and University of Basel, Basel, Switzerland.
| | - Brett McKenzie
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.
| | - Vahid Entezari
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.
| | - Andrea Cereatti
- Information Engineering Unit, POLCOMING Department, University of Sassari, Sassari, Italy.
| | - Ugo Della Croce
- Information Engineering Unit, POLCOMING Department, University of Sassari, Sassari, Italy.
| | - Arun J Ramappa
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, 02215, MA, USA.
| | - Ara Nazarian
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.
| | - Joseph P DeAngelis
- Department of Orthopaedic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Stoneman 10, Boston, 02215, MA, USA.
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Hereter Gregori J, Bureau NJ, Billuart F, Hagemeister N. Coaptation/elevation role of the middle deltoid muscle fibers: a static biomechanical pilot study using shoulder MRI. Surg Radiol Anat 2014; 36:1001-7. [PMID: 24800902 DOI: 10.1007/s00276-014-1302-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 04/15/2014] [Indexed: 11/29/2022]
Abstract
PURPOSE It is generally recognized that the middle deltoid muscle fibers (MDMF) have an elevating effect on the humeral head at small abduction angles. These forces are normally counterbalanced by the coaptation effect of the rotator cuff (RC) muscles to maintain shoulder stability. With RC tears, this balance may be jeopardized leading to shoulder dysfunction. Conversely, not all patients with RC tears develop shoulder dysfunction. The purpose of this study was to investigate the coaptation/elevation forces (CEF) ratio of the MDMF in RC tears subjects and in volunteers, using magnetic resonance imaging (MRI). METHODS Magnetic resonance imaging images in 10 subjects with RC tears and in five volunteers were used to build a three-dimensional model of the shoulder. The CEF ratio of the MDMF was estimated by representing the glenohumeral joint as a pulley. RESULTS The CEF ratio increased from the posterior to the anterior fibers of the MDMF.The median and interquartile range (IQR) of the CEF ratios of the posterior-third, middle-third, anterior-third and anterior-surface segments of the deltoid were: 0.16 (IQR = 0.23), 0.61 (IQR = 0.4), 1.42 (IQR = 0.41), 1.94 (IQR = 0.56) in subjects, and 0.06 (IQR = 0.24), 0.45 (IQR = 0.28), 1.32 (IQR = 1.01), 1.49 (IQR = 0.39) in volunteers. In the subjects, the CEF ratio of the anterior-surface segment was greater than all other segments (P ≤ 0.03). CONCLUSIONS The CEF ratio of the MDMF increased from its posterior segment to its anterior segment, indicating a greater stabilizing effect of the anterior segment both in RC tears subjects and in volunteers. Strengthening of the anterior fibers of the MDMF could potentially improve shoulder function in subjects with RC tears.
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Affiliation(s)
- Joan Hereter Gregori
- Department of GPA, Laboratoire de recherche en Imagerie et Orthopédie (LIO), École de Technologie Supérieure (ÉTS), Montréal, QC, H2L2W5, Canada,
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Chalmers PN, Cip J, Trombley R, Cole BJ, Wimmer MA, Romeo AA, Verma NN. Glenohumeral Function of the Long Head of the Biceps Muscle: An Electromyographic Analysis. Orthop J Sports Med 2014; 2:2325967114523902. [PMID: 26535304 PMCID: PMC4555617 DOI: 10.1177/2325967114523902] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Background: Optimal treatment of superior labral anterior-posterior (SLAP) tears is controversial, in part because the dynamic role of the long head of the biceps muscle (LHBM) in the glenohumeral joint is unclear. The aim of this study was to determine dynamic LHBM behavior during shoulder activity by studying (1) the electromyographic activity of the LHBM during shoulder motion, (2) the effect of elbow immobilization on this activity, and (3) the effect of a load applied to the distal humerus on this activity. Hypothesis: The LHBM would not play a significant role in active glenohumeral range of motion. Study Design: Controlled laboratory study. Methods: Thirteen normal volunteers underwent surface electromyography (EMG) measurement of the LHBM, short head biceps muscle (SHBM), deltoid, infraspinatus, and brachioradialis during shoulder motion from the neutral position (0° of rotation, flexion, and abduction) to 45° of flexion, 90° of flexion, 45° of abduction, and 90° of abduction. These motions were repeated both with and without splint immobilization of the forearm and elbow at 100° of flexion and neutral rotation and with and without a 1-kg weight placed on the lateral distal humerus. Results: Mean EMG activity within the LHBM and the SHBM was low (≤11.6% ± 9.1%). LHBM activity was significant increased by flexion and abduction (P < .049 in all cases), while SHBM activity was not. EMG activity from the middle head of the deltoid was significantly increased by loading with the shoulder positioned away from the body (ie, in abduction or flexion). When compared with the unloaded state, the addition of a distal humeral load significantly increased LHBM activity in 45° of abduction (P = .028) and 90° of flexion (P = .033) despite forearm and elbow immobilization. The SHBM showed similar trends. Conclusion: In normal volunteers with forearm and elbow immobilization and application of a load to the distal humerus, LHBM EMG activity is increased by both glenohumeral flexion and abduction, suggesting that this muscle plays a dynamic role in glenohumeral motion with higher demand activities. Clinical Relevance: Biceps tenodesis may result in dynamic change within the glenohumeral joint with higher demand activities.
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Affiliation(s)
- Peter N Chalmers
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Johannes Cip
- Department of Orthopaedic Surgery, Academic Teaching Hospital Landeskrankenhaus, Feldkirch, Vorarlberg, Austria
| | - Robert Trombley
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Brian J Cole
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Markus A Wimmer
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Anthony A Romeo
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
| | - Nikhil N Verma
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA
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McCormick F, Bhatia S, Chalmers P, Gupta A, Verma N, Romeo AA. The management of type II superior labral anterior to posterior injuries. Orthop Clin North Am 2014; 45:121-8. [PMID: 24267213 DOI: 10.1016/j.ocl.2013.08.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Arthroscopic repair of type II superior labral anterior to posterior (SLAP) tears is currently the standard of care, with most patients obtaining good to excellent surgical results. However, overhead athletes and older patients have inferior outcomes. Recent clinical studies and biomechanical data suggest that a biceps tenodesis is a suitable alternative in select patients. This article reviews the literature to identify the biomechanical and clinical indications for performing a biceps tenodesis for type II SLAP lesions.
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Affiliation(s)
- Frank McCormick
- Midwest Orthopaedics at Rush, Rush University Medical Center, 1611 West Harrison Street, Suite 300, Chicago, IL 60612, USA.
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40
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Telles S, Yadav A, Kumar N, Sharma S, Visweshwaraiah NK, Balkrishna A. Blood pressure and Purdue pegboard scores in individuals with hypertension after alternate nostril breathing, breath awareness, and no intervention. Med Sci Monit 2013; 19:61-6. [PMID: 23334063 PMCID: PMC3628802 DOI: 10.12659/msm.883743] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Background Previously alternate nostril yoga breathing (anuloma-viloma pranayama) was shown to reduce the blood pressure (BP) in people with hypertension. An elevated BP has been associated with poor performance in certain tasks requiring attention and co-ordination. The Purdue pegboard task assesses manual dexterity and eye-hand co-ordination. Material/Methods In the present study there were ninety participants with essential hypertension. Their ages ranged from 20 to 59 years (group average age ±S.D., 49.7±9.5 years; sixty males). Participants were randomized as three groups, with thirty participants in each group. One group practiced alternate nostril yoga breathing for 10 minutes, the second group practiced breath awareness for the same duration and the third group was given a control intervention (i.e., reading a magazine with neutral content). Assessments were taken before and after the interventions for participants of the three groups. Assessments included the blood pressure and performance in the Purdue pegboard task. Data were analyzed with a repeated measures ANOVA and post-hoc analyses were Bonferroni adjusted. Results Following alternate nostril breathing (ANYB) there was a significant decrease in systolic and diastolic blood pressure (p<0.001 and p<0.05), and an improvement in Purdue pegboard task scores for both hands (p<0.05), and for the right hand (p<.001). Breath awareness (the control session) also showed a significant decrease in systolic blood pressure (p<0.05). The right hand scores improved in the group reading a magazine (p<0.05). Conclusions The results suggest that the immediate effect of ANYB is to reduce the BP while improving the performing in a task requiring attention, bimanual dexterity and visuo-motor co-ordination.
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Brzychczy-Wloch M, Wojkowska-Mach J, Helwich E, Heczko PB. Incidence of maternal GBS colonization and neonatal GBS disease among very low birth weight Polish neonates. Med Sci Monit 2013; 19:34-9. [PMID: 23306376 PMCID: PMC3628589 DOI: 10.12659/msm.883733] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background In 2008, the Polish Gynecological Society issued recommendations to screen pregnant women for GBS colonization and offer antibiotic prophylaxis at delivery. The goal of this study was to assess compliance with these recommendations among women delivering very low birth weight infants (VLBW) in Poland. Material/Methods The 6 Polish Perinatological Institutions managing infections in the framework of the Polish Perinatological Network were subjected to the analysis. A retrospective case-cohort study for 2009 was conducted using the standard protocols and definitions. The collected data pertained to 812 pregnant women who gave birth to 910 babies with VLBW. Results The statistical variation across the 6 studied centers associated with GBS prevention of infections was noted. Bacteriological examinations of samples taken from the vagina were performed only in 273 (34%) of the women, ranging between 2% and 93%, depending on the center. GBS carriage was proven in 19% of these women, ranging between 8% and 27%. The culture method was inadequate because of highly variable results. It was found that the rate of GBS determination is statistically connected with the number of women’s screenings performed in the study centers. The intrapartum antibiotic prophylaxis (IAP) was used only in the half of GBS-positive women (47%). Six cases of early-onset GBS infections (5 blood stream infections and 1 pneumonia) were registered in the studied newborns, of which 4 neonates were born to women who received IAP against GBS. The incidence rate of GBS infection in VLBW neonates was 6.6 per 1000 live births, with a high death rate (up to 33%). Conclusions Poor compliance with GBS screening and antibiotic prevention were observed among women delivering very low birth weight infants. GBS infection was noted in a significant proportion of VLBW neonates; we believe a uniform policy should be put in place to manage these high-risk women and babies.
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Affiliation(s)
- Monika Brzychczy-Wloch
- Department of Bacteriology, Microbial Ecology and Parasitology, Jagiellonian University Medical College, Cracow, Poland.
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Hawkes DH, Alizadehkhaiyat O, Kemp GJ, Fisher AC, Roebuck MM, Frostick SP. Shoulder muscle activation and coordination in patients with a massive rotator cuff tear: an electromyographic study. J Orthop Res 2012; 30:1140-6. [PMID: 22213234 DOI: 10.1002/jor.22051] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Accepted: 12/02/2011] [Indexed: 02/04/2023]
Abstract
Adaptive muscle activation strategies following a massive rotator cuff tear (MRCT) are inadequately understood, and the relationship among muscles during everyday activities has not been considered. Thirteen healthy subjects comprised the control group, and 11 subjects with a MRCT the patient group. Upper limb function was assessed using the Functional Impairment test-hand, neck, shoulder, and arm (FIT-HaNSA). Electromyography (EMG) was recorded from 13 shoulder muscles, comprising five muscle groups, during a shelf-lifting task. Mean FIT-HaNSA scores were significantly lower in MRCT patients (p≤0.001), reflecting a severe functional deficit. In MRCT patients, EMG signal amplitude was significantly higher for the biceps brachii-brachioradialis (p < 0.001), upper trapezius-serratus anterior (p= 0.025), muscle groups and for the latissimus dorsi (p = 0.010), and teres major (p=0.007) muscles. No significant differences in the correlation among muscle groups were identified, pointing to an unchanged neuromuscular strategy following a tear. In MRCT patients, a reorganization of muscle activation strategy along the upper limb kinetic chain is aimed at reducing demand on the glenohumeral joint. Increased activation of the latissimus dorsi and teres major muscles is an attempt to compensate for the deficient rotator cuff. Re-education towards an alternate neuromuscular control strategy appears necessary to restore function.
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Affiliation(s)
- David H Hawkes
- Musculoskeletal Science Research Group, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
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