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Khanfar A, Alswerki MN, Al Qaroot B, Zahran M, Alshabatat L, Alarood S, Zurikat Z, Allahham E, Alemyan F. Shoulder MRI parameters in anticipating anterior shoulder dislocation: Are they a reliable and reproducible tool in clinical practice? Injury 2024; 55:111591. [PMID: 38761712 DOI: 10.1016/j.injury.2024.111591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 03/28/2024] [Accepted: 04/23/2024] [Indexed: 05/20/2024]
Abstract
BACKGROUND Anterior shoulder dislocation (ASD) is a frequently observed musculoskeletal injury that is often encountered in the context of sports activities or as a result of trauma. Several magnetic resonance imaging (MRI) parameters have been previously investigated for the purpose of characterizing the anatomical features, which could potentially be responsible for the episodes of instability. These measurements have the potential to identify patients who are susceptible to dislocation. Consequently, ensuring the reliability and consistency of these measurements is crucial in the diagnosis and the management of athletic or traumatic shoulder injuries. METHODS A group of four students, who had no previous experience in reading MRI series, were selected to perform radiographic measurements on specific parameters of MRI scans. These parameters were glenoid version, glenoid depth, glenoid width, humeral head diameter, humeral containing angle, and the ratio of humeral head diameter to glenoid diameter. The four participants conducted two distinct readings on a total of 28 sets of shoulder MRI scans. Simultaneously, the aforementioned measures were assessed by a consultant shoulder surgeon. RESULTS A total of 1512 measurements were categorized into nine sets: eight from students' measurements (two per student) and one from the consultant. Intra-rater reliability assessed by the intra-class correlation (ICC) test indicated excellent or good reliability for all parameters (p < 0.05), with glenoid depth showing the highest (0.925) and humeral-containing angles the lowest (0.675) ICC value. Inter-rater correlation, also evaluated using ICC, demonstrated strong correlation (p < 0.05), with glenoid diameter having the highest ICC score (0.935) and glenoid depth the lowest (0.849). Agreement analysis, expressed by Cohen's Kappa test, revealed substantial agreement (p < 0.05) for all parameters, with humeral head diameter having the highest agreement (0.90) and humeral-containing angle the lowest (0.73). CONCLUSION In this study, intra- and inter-rater MRI parameters are substantially concordant. Credibility comes from these reliability and agreement analyses' statistical significance. Glenoid diameter and depth are the most reliable intrarater and interrater, respectively. Best agreement was with the humeral-containing angle. These data demonstrate repeatability and clinical relevance. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Aws Khanfar
- Faculty of Medicine, University of Jordan, Amman, Jordan; Jordan University Hospital, Amman, Jordan; Orthopedic Department, Jordan University Hospital, Amman, Jordan
| | | | - Bashar Al Qaroot
- Faculty of Rehabilitation Sciences, Department of Prosthetics and Orthotics, University of Jordan, Amman, Jordan
| | | | | | | | - Zaid Zurikat
- Faculty of Medicine, University of Jordan, Amman, Jordan
| | - Eman Allahham
- Faculty of Rehabilitation Sciences, Department of Prosthetics and Orthotics, University of Jordan, Amman, Jordan
| | - Farah Alemyan
- Faculty of Rehabilitation Sciences, Department of Prosthetics and Orthotics, University of Jordan, Amman, Jordan
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Jezycki T, Jungmann F, Werth J, Emrich T, Kreitner KF. [Imaging of posttraumatic shoulder instability : Current concepts]. RADIOLOGIE (HEIDELBERG, GERMANY) 2024; 64:134-141. [PMID: 37947866 DOI: 10.1007/s00117-023-01234-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/13/2023] [Indexed: 11/12/2023]
Abstract
Posttraumatic instability accounts for more than 95% of all shoulder instabilities with the highest incidence in patients between 20 and 30 years of age. In this age group, lesions of the capsulolabral complex are the most common sequelae after the first shoulder dislocation. Typical acute findings are the Bankart and Perthes lesions and humeral avulsion of the glenohumeral ligament (HAGL). Chronic sequelae are anterior labroligamentous periosteal sleeve avulsion (ALPSA) lesions, and nonclassifiable lesions with deficient anterioinferior labrum and glenohumeral ligaments. Recently, quantification of Hill-Sachs and bony Bankart lesions with glenoid defects have become the focus of interest: bipolar bone loss has emerged to be one important factor of recurrent instability that has not been addressed during the first stabilizing operation. The glenoid track concept emphasizes the importance of bipolar bone loss, where the glenoid track refers to the contact area between the humeral head and the glenoid at the end-range of motion in abduction, extension and external rotation. Any lesion of the humeral head that extends beyond the glenoid track is considered high risk for engagement of the humeral head at the glenoid margin with subsequent dislocation. Both the Hill-Sachs interval and the glenoid track can be determined using computed tomography (CT) and magnetic resonance imaging and, thus, help to define the status of the shoulder (on-track vs. off-track), which is prerequisite for planning the appropriate operative procedure. Similar tendencies also exist for posttraumatic posterior instabilities which are much rarer.
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Affiliation(s)
- Thomas Jezycki
- Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie der Universitätsmedizin Mainz, Johannes Gutenberg-Universität, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - Florian Jungmann
- Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie der Universitätsmedizin Mainz, Johannes Gutenberg-Universität, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - Johanna Werth
- Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie der Universitätsmedizin Mainz, Johannes Gutenberg-Universität, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - Tilman Emrich
- Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie der Universitätsmedizin Mainz, Johannes Gutenberg-Universität, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - Karl-Friedrich Kreitner
- Klinik und Poliklinik für Diagnostische und Interventionelle Radiologie der Universitätsmedizin Mainz, Johannes Gutenberg-Universität, Langenbeckstr. 1, 55131, Mainz, Deutschland.
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Gomes E, Andrade R, Valente C, Santos JV, Nunes J, Carvalho Ó, Correlo VM, Silva FS, Oliveira JM, Reis RL, Espregueira-Mendes J. Inconsistency in Shoulder Arthrometers for Measuring Glenohumeral Joint Laxity: A Systematic Review. Bioengineering (Basel) 2023; 10:799. [PMID: 37508826 PMCID: PMC10376824 DOI: 10.3390/bioengineering10070799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/27/2023] [Accepted: 06/28/2023] [Indexed: 07/30/2023] Open
Abstract
There is no consensus on how to measure shoulder joint laxity and results reported in the literature are not well systematized for the available shoulder arthrometer devices. This systematic review aims to summarize the results of currently available shoulder arthrometers for measuring glenohumeral laxity in individuals with healthy or injured shoulders. Searches were conducted on the PubMed, EMBASE, and Web of Science databases to identify studies that measure glenohumeral laxity with arthrometer-assisted assessment. The mean and standard deviations of the laxity measurement from each study were compared based on the type of population and arthrometer used. Data were organized according to the testing characteristics. A total of 23 studies were included and comprised 1162 shoulders. Populations were divided into 401 healthy individuals, 278 athletes with asymptomatic shoulder, and 134 individuals with symptomatic shoulder. Sensors were the most used method for measuring glenohumeral laxity and stiffness. Most arthrometers applied an external force to the humeral head or superior humerus by a manual-assisted mechanism. Glenohumeral laxity and stiffness were mostly assessed in the sagittal plane. There is substantial heterogeneity in glenohumeral laxity values that is mostly related to the arthrometer used and the testing conditions. This variability can lead to inconsistent results and influence the diagnosis and treatment decision-making.
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Affiliation(s)
- Eluana Gomes
- Clínica Espregueira-FIFA Medical Centre of Excellence, 4350-415 Porto, Portugal
| | - Renato Andrade
- Clínica Espregueira-FIFA Medical Centre of Excellence, 4350-415 Porto, Portugal
- Dom Henrique Research Centre, 4350-415 Porto, Portugal
- Porto Biomechanics Laboratory (LABIOMEP), Faculty of Sports, University of Porto, 4200-450 Porto, Portugal
| | - Cristina Valente
- Clínica Espregueira-FIFA Medical Centre of Excellence, 4350-415 Porto, Portugal
- Dom Henrique Research Centre, 4350-415 Porto, Portugal
| | - J Victor Santos
- Centre for Microelectromechanical Systems (CMEMS-UMINHO), Campus Azurém, University of Minho, 4800-058 Guimarães, Portugal
| | - Jóni Nunes
- Clínica Espregueira-FIFA Medical Centre of Excellence, 4350-415 Porto, Portugal
- Serviço de Ortopedia e Traumatologia do Hospital de Santa Maria Maior, 4750-333 Barcelos, Portugal
- School of Medicine, University of Minho, 4710-057 Braga, Portugal
| | - Óscar Carvalho
- Centre for Microelectromechanical Systems (CMEMS-UMINHO), Campus Azurém, University of Minho, 4800-058 Guimarães, Portugal
- LABBELS Associate Laboratory, University of Minho, 4800-058 Guimarães, Portugal
| | - Vitor M Correlo
- ICVS/3B's-PT Government Associate Laboratory, 4805-017 Guimarães, Portugal
- 3B's Research Group, I3Bs-Research Institute on Biomaterials, Biodegradables and Biomimetics Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência E Tecnologia, University of Minho, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- Pro2B, Consultoria e Gestão de Projetos, AvePark-Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
| | - Filipe S Silva
- Centre for Microelectromechanical Systems (CMEMS-UMINHO), Campus Azurém, University of Minho, 4800-058 Guimarães, Portugal
- LABBELS Associate Laboratory, University of Minho, 4800-058 Guimarães, Portugal
| | - J Miguel Oliveira
- ICVS/3B's-PT Government Associate Laboratory, 4805-017 Guimarães, Portugal
- 3B's Research Group, I3Bs-Research Institute on Biomaterials, Biodegradables and Biomimetics Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência E Tecnologia, University of Minho, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
| | - Rui L Reis
- ICVS/3B's-PT Government Associate Laboratory, 4805-017 Guimarães, Portugal
- 3B's Research Group, I3Bs-Research Institute on Biomaterials, Biodegradables and Biomimetics Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência E Tecnologia, University of Minho, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
| | - João Espregueira-Mendes
- Clínica Espregueira-FIFA Medical Centre of Excellence, 4350-415 Porto, Portugal
- Dom Henrique Research Centre, 4350-415 Porto, Portugal
- School of Medicine, University of Minho, 4710-057 Braga, Portugal
- ICVS/3B's-PT Government Associate Laboratory, 4805-017 Guimarães, Portugal
- 3B's Research Group, I3Bs-Research Institute on Biomaterials, Biodegradables and Biomimetics Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência E Tecnologia, University of Minho, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
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Paul RW, DeBernardis DA, Hameed D, Clements A, Kamel SI, Freedman KB, Bishop ME. Effect of Preoperative MRI Coracoid Dimensions on Postoperative Outcomes of Latarjet Treatment for Anterior Shoulder Instability. Orthop J Sports Med 2022; 10:23259671221083967. [PMID: 35923867 PMCID: PMC9340370 DOI: 10.1177/23259671221083967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 12/15/2021] [Indexed: 11/17/2022] Open
Abstract
Background: Preoperative coracoid dimensions may affect the size of the bone graft transferred to the glenoid rim and thus the postoperative outcomes of Latarjet coracoid transfer. Purpose: To determine the effect of coracoid length and width as measured on preoperative magnetic resonance imaging (MRI) on outcomes after Latarjet treatment of anterior shoulder instability. Study Design: Cohort study; Level of evidence, 3. Methods: Included were patients who underwent primary Latarjet surgery between 2009 and 2019 and had preoperative MRI scans and minimum 2-year postoperative outcomes. Longitudinal coracoid length was measured on axial MRI sequences as the distance from the coracoclavicular ligament insertion to the distal tip. Comparisons were made between shorter and longer coracoids and between narrower and wider coracoids. The outcomes of interest were recurrent instability, reoperation, complications, return to sport (RTS), and American Shoulder and Elbow Surgeons (ASES) score. Independent-samples t test, Mann-Whitney test, chi-square test, and Fisher exact test were used to compare outcomes between groups, and univariate correlation coefficients were calculated to evaluate the relationships between demographics and coracoid dimensions. Results: Overall, 56 patients were included (mean age, 28.4 years). The mean ± SD coracoid length was 21.6 ± 2.4 mm and width 10.0 ± 1.0 mm. Relative to patients with a longer coracoid (≥22 mm; n = 26), patients with a shorter coracoid (<22 mm; n = 30) had similar rates of recurrent instability (shorter vs longer; 6.7% vs 3.8%), complications (10.0% vs 15.4%), reoperation (3.3% vs 7.7%), and RTS (76.5% vs 58.8%) and similar postoperative ASES scores (85.0 vs 81.6) ( P ≥ .05 for all). Likewise, relative to patients with a wider coracoid (≥10 mm; n = 27), patients with a narrower coracoid (<10 mm; n = 29) had similar prevalences of recurrent instability (narrower vs wider; 6.9% vs 3.7%), complications (17.2% vs 7.4%), reoperation (3.5% vs 7.4%), and RTS (66.7% vs 68.4%) and similar postoperative ASES scores (87.1 vs 80.0) ( P ≥ .05 for all). Conclusion: Patients undergoing Latarjet coracoid transfer had similar postoperative outcomes regardless of preoperative coracoid dimensions. These findings should be confirmed in a larger cohort before further clinical recommendations are made.
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Affiliation(s)
- Ryan W. Paul
- Rothman Orthopaedic Institute, Philadelphia, Pennsylvania, USA
| | | | - Daniel Hameed
- Cooper Medical School of Rowan University, Camden, New Jersey, USA
| | - Ari Clements
- Sidney Kimmel Medical College, Philadelphia, Pennsylvania, USA
| | - Sarah I. Kamel
- Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA
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Ferrando A, Aguilar J, Valencia M, Novo U, Calvo E. The Cartilage Wear Index: A new evaluation method to improve patient selection in surgical treatment of recurrent posterior glenohumeral instability. JSES Int 2022; 6:368-373. [PMID: 35572453 PMCID: PMC9091748 DOI: 10.1016/j.jseint.2021.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Background The purpose of this study was to validate glenoid cartilage lesions as a negative prognostic factor and to define a new image-based preoperative evaluation method to identify surgical candidates for arthroscopic labral refixation with suture anchors in posterior shoulder instability. Methods Twenty-six patients who underwent arthroscopic posterior labral repair for shoulder instability were evaluated. Only patients with structural dynamic posterior instability were included. We evaluated on preoperative magnetic resonance arthrogram: glenoid version, humeral head subluxation, type of capsular insertion, and the cartilage lesions using the new Cartilage Wear Index (CWI). Two subgroups were analyzed with regard to the preoperative CWI and shoulder outcome scores: Single Assessment Numerical Evaluation (SANE) and Western Ontario Shoulder Instability Index (WOSI). Results The median age at operation was 28 (interquartile range = 21-33) years. Median overall postoperative outcome assessment demonstrated a SANE of 90 and a WOSI of 385. The median CWI was 1.02. Subgroup analysis revealed worse median WOSI and SANE scores in patients with a CWI >1.02 and a strong correlation between a high preoperative CWI and a higher postoperative WOSI score (R = 0.58; P = .038). Conclusion The CWI can be useful to identify patients who might obtain better outcomes when treated with arthroscopic labral repair in posterior shoulder instability.
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Affiliation(s)
- Albert Ferrando
- Shoulder Unit, Hospital Universitari Sant Joan de Reus, Reus, Spain
- Corresponding author: Albert Ferrando, MD, PhD, Avinguda del Doctor Josep Laporte, 2, 43204 Reus, Tarragona, Spain.
| | - Juan Aguilar
- Shoulder and Elbow Unit, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Maria Valencia
- Shoulder and Elbow Unit, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Ulrike Novo
- Musculoskeletal radiology Department, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Emilio Calvo
- Shoulder and Elbow Unit, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
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Simão MN, Kobayashi MJ, Hernandes MDA, Nogueira-Barbosa MH. Evaluation of variations of the glenoid attachment of the inferior glenohumeral ligament by magnetic resonance arthrography. Radiol Bras 2021; 54:148-154. [PMID: 34108761 PMCID: PMC8177672 DOI: 10.1590/0100-3984.2020.0043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Objective To evaluate the anatomical variations of the attachment of the inferior glenohumeral ligament (IGHL) to the anterior glenoid rim. Materials and Methods This was a retrospective review of 93 magnetic resonance arthrography examinations of the shoulder. Two radiologists, who were blinded to the patient data and were working independently, read the examinations. Interobserver and intraobserver agreement were evaluated. The pattern of IGHL glenoid attachment and its position on the anterior glenoid rim were recorded. Results In 50 examinations (53.8%), the glenoid attachment was classified as type I (originating from the labrum), whereas it was classified as type II (originating from the glenoid neck) in 43 (46.2%). The IGHL emerged at the 4 o'clock position in 58 cases (62.4%), at the 3 o'clock position in 14 (15.0%), and at the 5 o'clock position in 21 (22.6%). The rates of interobserver and intraobserver agreement were excellent. Conclusion Although type I IGHL glenoid attachment is more common, we found a high prevalence of the type II variation. The IGHL emerged between the 3 o'clock and 5 o'clock positions, most commonly at the 4 o'clock position.
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Affiliation(s)
- Marcelo Novelino Simão
- Central Diagnóstico de Ribeirão Preto (Cedirp), Ribeirão Preto, SP, Brazil.,Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo (HCFMRP-USP), Ribeirão Preto, SP, Brazil
| | | | - Matheus de Andrade Hernandes
- Central Diagnóstico de Ribeirão Preto (Cedirp), Ribeirão Preto, SP, Brazil.,Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo (HCFMRP-USP), Ribeirão Preto, SP, Brazil
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Dixit A, Dandu N, Hadley CJ, Nazarian LN, Cohen SB, Ciccotti MG. Ultrasonographic Technique, Appearance, and Diagnostic Accuracy for Common Shoulder Sports Injuries: A Narrative Review. JBJS Rev 2021; 9:01874474-202104000-00011. [PMID: 33886525 DOI: 10.2106/jbjs.rvw.20.00099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
» Ultrasonography (US) is valued for its availability, tolerability, low cost, and utility in real-time dynamic evaluation. Its use in diagnosing upper-extremity shoulder injury has expanded, but several features require definition before more widespread adoption can be realized. » In particular, the evaluation of rotator cuff tears (RCTs) with US has been extensively studied, and authors generally agree that US is comparable with magnetic resonance imaging for the detection of full-thickness RCTs, whereas partial-thickness RCTs are more difficult to accurately identify with US. Dynamic evaluation is particularly useful for pathologies such as subacromial impingement and glenohumeral instability. » US has shown particular usefulness for the assessment of athletes, where there is additional motivation to delay more invasive techniques. US has demonstrated promising results as a diagnostic modality for common shoulder injuries in athletes, and it is an important imaging tool that complements a thorough history and physical examination.
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Affiliation(s)
- Anant Dixit
- The Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Navya Dandu
- Drexel University College of Medicine, Philadelphia, Pennsylvania
| | - Christopher J Hadley
- The Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Levon N Nazarian
- Thomas Jefferson University Hospital at Sidney Kimmel Medical College, Philadelphia, Pennsylvania
| | - Steven B Cohen
- The Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Michael G Ciccotti
- The Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
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Abstract
Most first-time anterior glenohumeral dislocations occur as the result of trauma. Many patients suffer recurrent episodes of anterior shoulder instability (ASI). The anatomy and biomechanics of ASI is addressed, as is the pathophysiology of capsulolabral injury. The roles of imaging modalities are described, including computed tomography (CT) and MR imaging with the additional value of arthrography and specialized imaging positions. Advances in 3D CT and MR imaging particularly with respect to the quantification of humeral and glenoid bone loss is discussed. The concepts of engaging and nonengaging lesions as well as on-track and off-track lesions are examined.
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Affiliation(s)
- Christopher J Burke
- Department of Radiology, NYU Langone Health, NYU Langone Orthopedic Center, 333 East 38th Street, New York, NY 10016, USA.
| | - Tatiane Cantarelli Rodrigues
- Department of Radiology, NYU Langone Health, NYU Langone Orthopedic Center, 333 East 38th Street, New York, NY 10016, USA
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Bäcker HC, Galle SE, Maniglio M, Rosenwasser MP. Biomechanics of posterior shoulder instability - current knowledge and literature review. World J Orthop 2018; 9:245-254. [PMID: 30479971 PMCID: PMC6242730 DOI: 10.5312/wjo.v9.i11.245] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 08/31/2018] [Accepted: 10/10/2018] [Indexed: 02/06/2023] Open
Abstract
Posterior instability of the shoulder is a rare condition and represents about 10% of shoulder instability. It has become more frequently recognized in the last year, even though it is more difficult to diagnose than anterior shoulder instability. As this form of shoulder pathology is somewhat rare, biomechanical knowledge is limited. The purpose of our study was to perform an extensive literature search, including PubMed and Medline, and to give an overview of the current knowledge on the biomechanics of posterior shoulder instability. The PubMed/Medline databases were utilized, and all articles related to posterior shoulder instability and biomechanics were included to form a comprehensive compilation of current knowledge. A total of 93 articles were deemed relevant according to our inclusion and exclusion criteria. As expected with any newly acknowledged pathology, biomechanical studies on posterior shoulder instability remain limited in the literature. Current biomechanical models are performed in a static manner, which limits their translation for explaining a dynamic pathology. Newer models should incorporate dynamic stabilization of both the rotator cuff and scapulothoracic joint. There is a current lack of knowledge with regards to the pathomechanism of posterior shoulder instability, with no consensus on appropriate treatment regimens. Further investigation is therefore required at both basic science and clinical levels.
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Affiliation(s)
- Henrik Constantin Bäcker
- Department of Orthopedic Surgery, New York Presbyterian/Columbia University Medical Center, New York, NY 10032, United States
| | - Samuel E Galle
- Department of Orthopedic Surgery, New York Presbyterian/Columbia University Medical Center, New York, NY 10032, United States
| | - Mauro Maniglio
- Department of Orthopedics, HFR Cantonal Hospital of Fribourg, Fribourg 1752, Switzerland
| | - Melvin Paul Rosenwasser
- Department of Orthopedic Surgery, New York Presbyterian/Columbia University Medical Center, New York, NY 10032, United States
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Yang TC, Chen KH, Chiang ER, Chang MC, Ma HL. Using the "Hill-Sachs interval to glenoid track width ratio" for prediction of recurrent instability after arthroscopic Bankart repair. Orthop Traumatol Surg Res 2018; 104:797-801. [PMID: 29654932 DOI: 10.1016/j.otsr.2018.02.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/26/2017] [Accepted: 02/27/2018] [Indexed: 02/08/2023]
Abstract
INTRODUCTION The glenoid track concept was used to confirm the engaging Hill-Sachs lesion (HSL) as a risk factor for recurrent instability following arthroscopic Bankart repair (ABR). However, the post-operative condition of soft tissue in vivo was not comparable to that designed in the intact condition in vitro in the original study of the glenoid track concept. Herein, the possibility of engagement may be underestimated. HYPOTHESIS A threshold of the Hill-Sachs interval to glenoid track width ratio (H/G ratio) that is related to recurrent instability after ABR could be found, in order to adjust the original glenoid track concept. PATIENTS AND METHODS Patients who underwent ABR with minimum 24-months follow-up were reviewed retrospectively. The primary outcome was evaluated with the recurrent instability. The H/G ratio of individual patients was used to calculate the sensitivity, specificity, and a receiver operating characteristic (ROC) curve, which aimed to establish a H/G ratio threshold related to recurrent instability after ABR. RESULTS From June 2005 to December 2013, 160 patients with a mean age of 27.7years were enrolled. The mean follow-up period was 77.2 months. The ROC curve indicated that H/G ratio≥0.7 had the sensitivity and specificity of 0.74 and 0.71, respectively, in predicting recurrent instability. On univariate logistic regression analysis, the H/G ratio≥0.7 was a significant predictor of higher risk for recurrent instability (p<0.001). DISCUSSION H/G ratio seems to be a reliable parameter for predicting recurrent instability. H/G ratio≥0.7 may be considered as a positive predictor for recurrent instability after ABR. LEVEL OF EVIDENCE Level IV: retrospective diagnostic study.
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Affiliation(s)
- T-C Yang
- Department of Orthopaedics & Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan.
| | - K-H Chen
- Orthopaedic Department School of Medicine, National Yang-Ming University; Department of Orthopaedics & Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - E-R Chiang
- Orthopaedic Department School of Medicine, National Yang-Ming University; Department of Orthopaedics & Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - M-C Chang
- Orthopaedic Department School of Medicine, National Yang-Ming University; Department of Orthopaedics & Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - H-L Ma
- Orthopaedic Department School of Medicine, National Yang-Ming University; Department of Orthopaedics & Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan.
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