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Schlicht F, Vosshenrich J, Donners R, Seifert AC, Fenchel M, Nickel D, Obmann M, Harder D, Breit HC. Advanced deep learning-based image reconstruction in lumbar spine MRI at 0.55 T - Effects on image quality and acquisition time in comparison to conventional deep learning-based reconstruction. Eur J Radiol Open 2024; 12:100567. [PMID: 38711678 PMCID: PMC11070664 DOI: 10.1016/j.ejro.2024.100567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 04/19/2024] [Accepted: 04/24/2024] [Indexed: 05/08/2024] Open
Abstract
Objectives To evaluate an optimized deep leaning-based image post-processing technique in lumbar spine MRI at 0.55 T in terms of image quality and image acquisition time. Materials and methods Lumbar spine imaging was conducted on 18 patients using a 0.55 T MRI scanner, employing conventional (CDLR) and advanced (ADLR) deep learning-based post-processing techniques. Two musculoskeletal radiologists visually evaluated the images using a 5-point Likert scale to assess image quality and resolution. Quantitative assessment in terms of signal intensities (SI) and contrast ratios was performed by region of interest measurements in different body-tissues (vertebral bone, intervertebral disc, spinal cord, cerebrospinal fluid and autochthonous back muscles) to investigate differences between CDLR and ADLR sequences. Results The images processed with the advanced technique (ADLR) were rated superior to the conventional technique (CDLR) in terms of signal/contrast, resolution, and assessability of the spinal canal and neural foramen. The interrater agreement was moderate for signal/contrast (ICC = 0.68) and good for resolution (ICC = 0.77), but moderate for spinal canal and neuroforaminal assessability (ICC = 0.55). Quantitative assessment showed a higher contrast ratio for fluid-sensitive sequences in the ADLR images. The use of ADLR reduced image acquisition time by 44.4%, from 14:22 min to 07:59 min. Conclusions Advanced deep learning-based image reconstruction algorithms improve the visually perceived image quality in lumbar spine imaging at 0.55 T while simultaneously allowing to substantially decrease image acquisition times. Clinical relevance Advanced deep learning-based image post-processing techniques (ADLR) in lumbar spine MRI at 0.55 T significantly improves image quality while reducing image acquisition time.
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Affiliation(s)
- Felix Schlicht
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Jan Vosshenrich
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Ricardo Donners
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Alina Carolin Seifert
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Matthias Fenchel
- Siemens Healthcare GmbH, Magnetic Resonance, Allee am Röthelheimpark 2, Erlangen 91052, Germany
| | - Dominik Nickel
- Siemens Healthcare GmbH, Magnetic Resonance, Allee am Röthelheimpark 2, Erlangen 91052, Germany
| | - Markus Obmann
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Dorothee Harder
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
| | - Hanns-Christian Breit
- Department of Radiology, University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland
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Pojskic M, Bisson E, Oertel J, Takami T, Zygourakis C, Costa F. Lumbar disc herniation: Epidemiology, clinical and radiologic diagnosis WFNS spine committee recommendations. World Neurosurg X 2024; 22:100279. [PMID: 38440379 PMCID: PMC10911853 DOI: 10.1016/j.wnsx.2024.100279] [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] [Received: 07/28/2023] [Accepted: 02/01/2024] [Indexed: 03/06/2024] Open
Abstract
Objective To formulate the most current, evidence-based recommendations regarding the epidemiology, clinical diagnosis, and radiographic diagnosis of lumbar herniated disk (LDH). Methods A systematic literature search in PubMed, MEDLINE, and CENTRAL was performed from 2012 to 2022 using the search terms "herniated lumbar disc", "epidemiology", "prevention" "clinical diagnosis", and "radiological diagnosis". Screening criteria resulted in 17, 16, and 90 studies respectively that were analyzed regarding epidemiology, clinical diagnosis, and radiographic diagnosis of LDH. Using the Delphi method and two rounds of voting at two separate international meetings, ten members of the WFNS (World Federation of Neurosurgical Societies) Spine Committee generated eleven final consensus statements. Results The lifetime risk for symptomatic LDH is 1-3%; of these, 60-90% resolve spontaneously. Risk factors for LDH include genetic and environmental factors, strenuous activity, and smoking. LDH is more common in males and in 30-50 year olds. A set of clinical tests, including manual muscle testing, sensory testing, Lasegue sign, and crossed Lasegue sign are recommended to diagnose LDH. Magnetic resonance imaging (MRI) is the gold standard for confirming suspected LDH. Conclusions These eleven final consensus statements provide current, evidence-based guidelines on the epidemiology, clinical diagnosis, and radiographic diagnosis of LDH for practicing spine surgeons worldwide.
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Affiliation(s)
- Mirza Pojskic
- Department of Neurosurgery, University of Marburg, Germany
| | - Erica Bisson
- Department of Neurosurgery, University of Utah, Salt Lake City, UT, USA
| | - Joachim Oertel
- Department of Neurosurgery, Saarland University Medical Centre, Homburg, Saarland, Germany
| | - Toshihiro Takami
- Department of Neurosurgery, Osaka Medical and Pharmaceutical University, Japan
| | - Corinna Zygourakis
- Department of Neurosurgery, Stanford University Medical Center, Stanford, CA, USA
| | - Francesco Costa
- Spine Surgery Unit (NCH4) - Department of Neurosurgery - Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
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Cao G, Li Y, Wu S, Li W, Long J, Xie Y, Xia J. Clinical feasibility of MRI-based synthetic CT imaging in the diagnosis of lumbar disc herniation: a comparative study. Acta Radiol 2024; 65:41-48. [PMID: 37071506 PMCID: PMC10798008 DOI: 10.1177/02841851231169173] [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: 07/29/2022] [Accepted: 12/05/2022] [Indexed: 04/19/2023]
Abstract
BACKGROUND Computed tomography (CT) and magnetic resonance imaging (MRI) are indicated for use in preoperative planning and may complicate diagnosis and place a burden on patients with lumbar disc herniation. PURPOSE To investigate the diagnostic potential of MRI-based synthetic CT with conventional CT in the diagnosis of lumbar disc herniation. MATERIAL AND METHODS After obtaining prior institutional review board approval, 19 patients who underwent conventional and synthetic CT imaging were enrolled in this prospective study. Synthetic CT images were generated from the MRI data using U-net. The two sets of images were compared and analyzed qualitatively by two musculoskeletal radiologists. The images were rated on a 4-point scale to determine their subjective quality. The agreement between the conventional and synthetic images for a diagnosis of lumbar disc herniation was determined independently using the kappa statistic. The diagnostic performances of conventional and synthetic CT images were evaluated for sensitivity, specificity, and accuracy, and the consensual results based on T2-weighted imaging were employed as the reference standard. RESULTS The inter-reader and intra-reader agreement were almost moderate for all evaluated modalities (κ = 0.57-0.79 and 0.47-0.75, respectively). The sensitivity, specificity, and accuracy for detecting lumbar disc herniation were similar for synthetic and conventional CT images (synthetic vs. conventional, reader 1: sensitivity = 91% vs. 81%, specificity = 83% vs. 100%, accuracy = 87% vs. 91%; P < 0.001; reader 2: sensitivity = 84% vs. 81%, specificity = 85% vs. 98%, accuracy = 84% vs. 90%; P < 0.001). CONCLUSION Synthetic CT images can be used in the diagnostics of lumbar disc herniation.
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Affiliation(s)
- Gan Cao
- Department of Radiology, Longgang Central Hospital of Shenzhen, Shenzhen, PR China
- Department of Radiology, The First Affiliated Hospital of Shenzhen University, Health Science Center, Shenzhen Second People's Hospital, Shenzhen, PR China
| | - Yafen Li
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, PR China
| | - Shibin Wu
- PingAn Technology, Shenzhen, Guangdong, PR China
| | - Wen Li
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, PR China
| | - Jia Long
- Department of Radiology, The First Affiliated Hospital of Shenzhen University, Health Science Center, Shenzhen Second People's Hospital, Shenzhen, PR China
| | - Yaoqin Xie
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, PR China
| | - Jun Xia
- Department of Radiology, The First Affiliated Hospital of Shenzhen University, Health Science Center, Shenzhen Second People's Hospital, Shenzhen, PR China
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4
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Shoghli A, Chow D, Kuoy E, Yaghmai V. Current role of portable MRI in diagnosis of acute neurological conditions. Front Neurol 2023; 14:1255858. [PMID: 37840918 PMCID: PMC10576557 DOI: 10.3389/fneur.2023.1255858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/06/2023] [Indexed: 10/17/2023] Open
Abstract
Neuroimaging is an inevitable component of the assessment of neurological emergencies. Magnetic resonance imaging (MRI) is the preferred imaging modality for detecting neurological pathologies and provides higher sensitivity than other modalities. However, difficulties such as intra-hospital transport, long exam times, and availability in strict access-controlled suites limit its utility in emergency departments and intensive care units (ICUs). The evolution of novel imaging technologies over the past decades has led to the development of portable MRI (pMRI) machines that can be deployed at point-of-care. This article reviews pMRI technologies and their clinical implications in acute neurological conditions. Benefits of pMRI include timely and accurate detection of major acute neurological pathologies such as stroke and intracranial hemorrhage. Additionally, pMRI can be potentially used to monitor the progression of neurological complications by facilitating serial measurements at the bedside.
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Affiliation(s)
| | | | | | - Vahid Yaghmai
- Department of Radiological Sciences, School of Medicine, University of California, Irvine, Irvine, CA, United States
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5
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Abstract
This article provides a focused overview of emerging technology in musculoskeletal MRI and CT. These technological advances have primarily focused on decreasing examination times, obtaining higher quality images, providing more convenient and economical imaging alternatives, and improving patient safety through lower radiation doses. New MRI acceleration methods using deep learning and novel reconstruction algorithms can reduce scanning times while maintaining high image quality. New synthetic techniques are now available that provide multiple tissue contrasts from a limited amount of MRI and CT data. Modern low-field-strength MRI scanners can provide a more convenient and economical imaging alternative in clinical practice, while clinical 7.0-T scanners have the potential to maximize image quality. Three-dimensional MRI curved planar reformation and cinematic rendering can provide improved methods for image representation. Photon-counting detector CT can provide lower radiation doses, higher spatial resolution, greater tissue contrast, and reduced noise in comparison with currently used energy-integrating detector CT scanners. Technological advances have also been made in challenging areas of musculoskeletal imaging, including MR neurography, imaging around metal, and dual-energy CT. While the preliminary results of these emerging technologies have been encouraging, whether they result in higher diagnostic performance requires further investigation.
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Affiliation(s)
- Richard Kijowski
- From the Department of Radiology, New York University Grossman School of Medicine, 660 First Ave, 3rd Floor, New York, NY 10016
| | - Jan Fritz
- From the Department of Radiology, New York University Grossman School of Medicine, 660 First Ave, 3rd Floor, New York, NY 10016
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6
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Pogarell T, May MS, Nagel AM, Uder M, Heiss R. [Imaging of the musculoskeletal system using low-field magnetic resonance imaging]. Radiologe 2022; 62:410-417. [PMID: 35416477 DOI: 10.1007/s00117-022-01000-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2022] [Indexed: 12/01/2022]
Abstract
BACKGROUND Magnetic resonance imaging (MRI) plays a crucial role in musculoskeletal imaging. The high prevalence and pain-related suffering of patients pose a particular challenge concerning availability and turnover times, respectively. Low-field (≤ 1.0 T) MRI has the potential to fulfill these needs. However, during the past three decades, high field systems have increasingly replaced low field systems because of their limitations in image quality. Recent technological advancements in high-performance hard- and software promise musculoskeletal imaging with adequate quality at lower field strengths for several regions and indications. OBJECTIVES The goal is to provide insight into the advantages and disadvantages of low-field musculoskeletal imaging, discuss the current literature, and include our first experiences with a modern 0.55 T MRI. MATERIALS AND METHODS This review is based on research in various literature databases and our own musculoskeletal imaging experiences with a modern 0.55 T scanner. CONCLUSION Most publications pertaining to musculoskeletal imaging at low-field strength MRI are outdated, and studies regarding the diagnostic performance of modern low-field MRI systems are needed. These new systems may complement existing high-field systems and make MRI more accessible, even in low-income countries. From our own experience, modern low-field MRI seems to be adequate in musculoskeletal imaging, especially in acute injuries.
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Affiliation(s)
- Tobias Pogarell
- Radiologisches Institut, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Maximiliansplatz 3, 91054, Erlangen, Deutschland
| | - Matthias S May
- Radiologisches Institut, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Maximiliansplatz 3, 91054, Erlangen, Deutschland.,Imaging Science Institute, Universitätsklinikum Erlangen, Erlangen, Deutschland
| | - Armin M Nagel
- Radiologisches Institut, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Maximiliansplatz 3, 91054, Erlangen, Deutschland.,Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Deutschland
| | - Michael Uder
- Radiologisches Institut, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Maximiliansplatz 3, 91054, Erlangen, Deutschland.,Imaging Science Institute, Universitätsklinikum Erlangen, Erlangen, Deutschland
| | - Rafael Heiss
- Radiologisches Institut, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Maximiliansplatz 3, 91054, Erlangen, Deutschland. .,Imaging Science Institute, Universitätsklinikum Erlangen, Erlangen, Deutschland.
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7
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Udby PM, Ohrt-Nissen S, Bendix T, Brorson S, Carreon LY, Andersen MØ. The Association of MRI Findings and Long-Term Disability in Patients With Chronic Low Back Pain. Global Spine J 2021; 11:633-639. [PMID: 32875907 PMCID: PMC8165932 DOI: 10.1177/2192568220921391] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Longitudinal cohort study with 13-year follow-up. OBJECTIVE To assess whether long-term disability is associated with baseline degenerative magnetic resonance imaging (MRI) findings in patients with low back pain (LBP). METHODS In 2004-2005, patients aged 18 to 60 years with chronic LBP were enrolled in a randomized controlled trial and lumbar MRI was performed. Patients completed the Roland-Morris Disability Questionnaire (RMDQ) and the LBP Rating Scale, at baseline and 13 years after the MRI. Multivariate regression analysis was performed with 13-year RMDQ as the dependent variable and baseline disc degeneration (DD, Pfirrmann grade), Modic changes (MC), facet joint degeneration (FJD, Fujiwara grade) smoking status, body mass index, and self-reported weekly physical activity at leisure as independent variables. RESULTS Of 204 patients with baseline MRI, 170 (83%) were available for follow-up. Of these, 88 had Pfirrmann grade >III (52%), 67 had MC (39%) and 139 had Fujiwara grade >2 (82%) on at least 1 lumbar level. Only MC (β = -0.15, P = .031) and weekly physical activity at leisure (β = -0.51, P < .001) were significantly, negatively, associated with 13-year RMDQ-score (R2 = 0.31). CONCLUSION DD and FJD were not associated with long-term disability. Baseline MC and weekly physical activity at leisure were statistically significantly associated with less long-term disability.
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Affiliation(s)
- Peter Muhareb Udby
- Zealand University Hospital, Køge, Denmark,Rigshospitalet, University of Copenhagen, Copenhagen, Denmark,Spine Center of Southern Denmark, part of Lillebaelt Hospital, Middelfart, Denmark,Peter Muhareb Udby, Spine Unit, Zealand University Hospital, Lykkebækvej 1, 4600, Køge, Denmark.
| | | | - Tom Bendix
- Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | - Leah Y. Carreon
- Spine Center of Southern Denmark, part of Lillebaelt Hospital, Middelfart, Denmark
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Fiani B, Griepp DW, Lee J, Davati C, Moawad CM, Kondilis A. Weight-Bearing Magnetic Resonance Imaging as a Diagnostic Tool That Generates Biomechanical Changes in Spine Anatomy. Cureus 2020; 12:e12070. [PMID: 33489488 PMCID: PMC7805418 DOI: 10.7759/cureus.12070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Weight-bearing magnetic resonance imaging (MRI) is a unique modality in diagnostic imaging that allows for the assessment of spinal pathology in ways considered previously inaccessible or insufficient with the conventional MRI technique. Due to limitations in positioning within the MRI machine itself, difficulties would be posed in determining the underlying cause of a patient’s pain or neurological symptoms, as the traditional supine position utilized can, in many cases, alleviate the severity of presented symptoms. Weight-bearing MRI addresses this concern by allowing a clinician to position a patient (to a certain degree) into flexion, extension, rotation, or side-bending with an axial load that can mimic physiologic conditions in order to replicate the conditions the patient experiences in order to give clinicians a clearer understanding of the anatomical relationship of the spine and surrounding tissues that may lead to a particular presentation of symptoms. These findings can then guide treatment approaches that are better tailored to a patient’s needs in order to initiate treatment earlier and shorten the duration of treatment necessary for patient benefit. The goal of this review is to describe and differentiate weight-bearing MRI from conventional MRI as well as examine the advantages and disadvantages of either imaging modality. This will include assessing cost-effectiveness and improvements in clinical outcomes. Further, the advancements of weight-bearing MRI will be discussed, including potentially unique clinical applications in development.
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Affiliation(s)
- Brian Fiani
- Neurosurgery, Desert Regional Medical Center, Palm Springs, USA
| | - Daniel W Griepp
- Neurosurgery, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, USA
| | - Jason Lee
- Medicine, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, USA
| | - Cyrus Davati
- Medicine, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, USA
| | - Christina M Moawad
- Neurosurgery, Carle Illinois College of Medicine, University of Illinois at Urbana-Champaign, Champaign, USA
| | - Athanasios Kondilis
- Medicine, College of Osteopathic Medicine, Michigan State University, East Lansing, USA
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9
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Nordberg CL, Boesen M, Fournier GL, Bliddal H, Hansen P, Hansen BB. Positional changes in lumbar disc herniation during standing or lumbar extension: a cross-sectional weight-bearing MRI study. Eur Radiol 2020; 31:804-812. [PMID: 32822052 DOI: 10.1007/s00330-020-07132-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 04/30/2020] [Accepted: 07/31/2020] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To investigate biomechanical changes in lumbar disc herniations. METHODS Patients with lumbar disc herniation verified on a 1.5-3-T magnetic resonance imaging (MRI) scanner were imaged in a weight-bearing 0.25-T MRI scanner in (1) standing position, (2) conventional supine position with relative lumbar flexion, and (3) supine position with a forced lumbar extension by adding a lumbar pillow. The L2-S1 lordosis angle, the disc cross-sectional area, the disc cross-sectional diameter, and the spinal canal cross-sectional diameter were measured for each position. Disc degeneration and nerve root compression were graded, and the pain intensity was reported during each scan position. RESULTS Forty-three herniated discs in 37 patients (36.7 ± 11.9 years) were analyzed in each position. The L2-S1 lumbar angle increased in the standing position (mean difference [MD]: 5.61°, 95% confidence interval [95% CI]: 3.44 to 7.78) and with the lumbar pillow in the supine position (MD: 14.63°, 95% CI: 11.71 to 17.57), both compared with the conventional supine position. The herniated disc cross-sectional area and diameter increased during standing compared with during conventional supine position. No changes were found in the spinal canal cross-sectional diameter between positions. Higher nerve root compression grades for paracentral herniations were found during standing compared with during conventional supine position. This was neither found with a lumbar pillow nor for central herniations in any position compared with conventional supine. CONCLUSION Disc herniations displayed dynamic behavior with morphological changes in the standing position, leading to higher nerve root compression grades for paracentral herniated discs. KEY POINTS • Lumbar herniated discs increased in size in the axial plane during standing. • Increased nerve root compression grades for paracentral herniated discs were found during standing. • Weight-bearing MRI may increase the diagnostic sensitivity of nerve root compression in lumbar disc herniations.
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Affiliation(s)
- Cecilie Lerche Nordberg
- Department of Rheumatology, The Parker Institute, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Nordre Fasanvej 57, DK-2000 F, Copenhagen, Denmark. .,Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Copenhagen, Denmark.
| | - Mikael Boesen
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Gilles Ludger Fournier
- Department of Rheumatology, Copenhagen University Hospital, Rigshospitalet, Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Henning Bliddal
- Department of Rheumatology, The Parker Institute, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Nordre Fasanvej 57, DK-2000 F, Copenhagen, Denmark
| | - Philip Hansen
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Bjarke Brandt Hansen
- Department of Rheumatology, The Parker Institute, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Nordre Fasanvej 57, DK-2000 F, Copenhagen, Denmark
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Dragsbæk L, Kjaer P, Hancock M, Jensen TS. An exploratory study of different definitions and thresholds for lumbar disc degeneration assessed by MRI and their associations with low back pain using data from a cohort study of a general population. BMC Musculoskelet Disord 2020; 21:253. [PMID: 32303267 PMCID: PMC7165403 DOI: 10.1186/s12891-020-03268-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 04/03/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Lumbar disc degeneration seen on magnetic resonance imaging (MRI) is defined as loss of signal intensity and/or disc height, alone or in combination with other MRI findings. The MRI findings and thresholds used to define disc degeneration vary in the literature, and their associations with low back pain (LBP) remain uncertain. OBJECTIVE To explore how various thresholds of lumbar disc degeneration alter the association between disc degeneration and self-reported LBP. METHODS An exploratory, cross-sectional cohort study of a general population. Participants in the cohort 'Backs-on-Funen' had MRI scans and completed questionnaires about LBP at ages 41, 45 and 49 years. The MRI variables, signal intensity (Grades 0-3) and disc height (Grades 0-3), were dichotomised at different thresholds. Logistic regression analyses were used to determine associations. Arbitrarily, a difference in odds ratio (OR) of > 0.5 between thresholds was considered clinically relevant. Receiver Operating Characteristic curves were used to investigate differences between diagnostic values at each threshold. RESULTS At age 41, the difference in ORs between signal loss and LBP exceeded 0.5 between the thresholds of ≥2 (OR = 2.02) and = 3 (OR = 2.57). Difference in area under the curves (AUC) was statistically significant (p = 0.02). At ages 45 and 49, the difference in ORs exceeded 0.5 between the thresholds of ≥2 and = 3, but the differences between AUC were not statistically significant. At age 41, the difference in ORs between disc height loss and LBP at the thresholds of ≥1 (OR = 1.44) and ≥ 2 (OR = 2.53) exceeded 0.5. Differences in AUC were statistically significant (p = 0.004). At age 49, differences in ORs exceeded 0.5 (OR = 2.49 at the ≥1 threshold, 1.84 at ≥2 and 0.89 at =3). Differences between AUC were not statistically significant. CONCLUSION The results suggest that the thresholds used to define the presence of lumbar disc degeneration influence how strongly it is associated with LBP. Thresholds at more severe grades of disc signal and disc height loss were more strongly associated with LBP at age 41, but thresholds at moderate grades of disc degeneration were most strongly associated with LBP at ages 45 and 49.
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Affiliation(s)
- Line Dragsbæk
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230, Odense, Denmark
| | - Per Kjaer
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230, Odense, Denmark. .,Health Sciences Research Centre, UCL University College, Odense, Denmark.
| | - Mark Hancock
- Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Tue Secher Jensen
- Department of Diagnostic Imaging, Silkeborg Regional Hospital, Silkeborg, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Nordic Institute of Chiropractic and Clinical Biomechanics, Odense, Denmark
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Little JW, Grieve T, Cantu J, Bogar WC, Heiser R, Miley H, Cramer GD. Reliability of Human Lumbar Facet Joint Degeneration Severity Assessed by Magnetic Resonance Imaging. J Manipulative Physiol Ther 2020; 43:43-49. [PMID: 32081513 DOI: 10.1016/j.jmpt.2018.11.027] [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: 05/03/2018] [Revised: 10/08/2018] [Accepted: 11/02/2018] [Indexed: 10/25/2022]
Abstract
OBJECTIVE The purpose of this study was to determine the reliability of the assessment of lumbar facet joint degeneration severity by analyzing degeneration subscales using magnetic resonance imaging (MRI) in human participants. METHODS The reliability of articular cartilage degeneration, subchondral bone sclerosis, and osteophyte formation subscales of lumbar facet joint degeneration severity was assessed in MRI images from n = 10 human participants. Each scale was applied to n = 20 lumbar facet joints (L4/5 level). Three examiners were trained. A first assessment of MRI images was provided by the examiners followed by a second assessment 30 days later. Intraobserver and interobserver reliability were determined using percent agreement, the weighted kappa coefficient κw for paired comparisons, and the overall weighted kappa κo. The minimum threshold for reliability was set at moderate levels of agreement, κw > 0.40, based upon previous recommendations. RESULTS The articular cartilage subscale had acceptable intraobserver (κo = 0.51) and interobserver (κo = 0.41) reliability. Scales for subchondral bone sclerosis (intraobserver κo = 0.28; interobserver κo = 0.10) and osteophyte formation (intraobserver κo = 0.26; interobserver κo = 0.20) did not achieve acceptable reliability. CONCLUSION Of the 3 subcategories of lumbar facet joint degeneration, only articular cartilage degeneration demonstrated acceptable reliability. Subscales of lumbar facet joint degeneration should be considered independently for reliability before combining subscales for a global degeneration score. Owing to the inherent difficulty of assessing lumbar facet joint degeneration, the use of multiple examiners independently assessing degeneration with reliable scales and then coming to a consensus score upon any disagreements is recommended for future clinical studies.
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Affiliation(s)
- Joshua W Little
- Department of Surgery, Center for Anatomical Science and Education, School of Medicine, Saint Louis University, St. Louis, Missouri.
| | - Thomas Grieve
- Department of Clinical Sciences, National University of Health Sciences, Lombard, Illinois
| | - Joseph Cantu
- Department of Research, National University of Health Sciences, Lombard, Illinois
| | - William C Bogar
- Department of Diagnostic Imaging, National University of Health Sciences, Lombard, Illinois
| | - Rudy Heiser
- Department of Diagnostic Imaging, National University of Health Sciences, Lombard, Illinois
| | - Heather Miley
- Department of Diagnostic Imaging, National University of Health Sciences, Lombard, Illinois
| | - Gregory D Cramer
- Department of Research, National University of Health Sciences, Lombard, Illinois
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Hansen BB, Ciochon UM, Trampedach CR, Christensen AF, Rasti Z, Boesen M. Grading lumbar disc degeneration: a comparison between low- and high-field MRI. Acta Radiol 2019; 60:1636-1642. [PMID: 31003590 DOI: 10.1177/0284185119842472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Bjarke B Hansen
- The Parker Institute, Copenhagen University Hospital, Frederiksberg, Denmark
| | - Urszula M Ciochon
- Department of Radiology, Copenhagen University Hospital, Frederiksberg, Denmark
| | | | | | - Zoreh Rasti
- Department of Radiology, Copenhagen University Hospital, Frederiksberg, Denmark
| | - Mikael Boesen
- The Parker Institute, Copenhagen University Hospital, Frederiksberg, Denmark
- Department of Radiology, Copenhagen University Hospital, Frederiksberg, Denmark
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Marzilger R, Schroll A, Bohm S, Arampatzis A. Muscle volume reconstruction from several short magnetic resonance imaging sequences. J Biomech 2019; 84:269-273. [PMID: 30655082 DOI: 10.1016/j.jbiomech.2018.12.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 12/07/2018] [Accepted: 12/19/2018] [Indexed: 11/26/2022]
Abstract
The gold standard to determine muscle morphological parameters is magnetic resonance imaging (MRI). To measure large muscles like the vastus lateralis (VL) in one sequence, scanners with a large field of view (FOV) and a high flux density are needed. However, large scanners are expensive and not always available. The purpose of the current study was to develop a marker-based approach to reconstruct the VL from several separate MRI sequences, acquired with a low-field MRI scanner. The VL muscle of 21 volunteers was marked at one-third and two-third of thigh length using fish oil capsules. Three consecutive MRI sequences (i.e. proximal, medial and distal part) of the thigh were captured between the markers and the muscle insertion and origin. After a manual segmentation of the VL the muscle was reconstructed using the developed approach. The muscle volume, maximal anatomical cross-sectional area and length were 715.1 ± 93.4 cm3, 34.0 ± 4.0 cm2 and 34.4 ± 2.2 cm respectively. The procedure showed an average error between 0.9% and 2.2% for the reconstructed muscle volume, the averaged RMSD between the cross-sectional areas of two overlapping sequences were between 0.80 ± 0.71 cm2 and 0.88 ± 0.78 cm2. The proposed approach provides an appropriate accuracy for muscle volume assessment, as the estimated error for muscle volume calculation was quite small. The reconstruction quality depends mainly on the proper marker attachment and identification, as well as the spatial resolution of the image sequences. We are confident that the presented method can be used in most investigations regarding muscle morphology.
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Affiliation(s)
- Robert Marzilger
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, Germany; Berlin School of Movement Sciences, Humboldt-Universität zu Berlin, Germany
| | - Arno Schroll
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, Germany; Berlin School of Movement Sciences, Humboldt-Universität zu Berlin, Germany
| | - Sebastian Bohm
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, Germany; Berlin School of Movement Sciences, Humboldt-Universität zu Berlin, Germany
| | - Adamantios Arampatzis
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, Germany; Berlin School of Movement Sciences, Humboldt-Universität zu Berlin, Germany.
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Andrade Gomes S, Lowrie M, Targett M. Long-term outcome following lateral foraminotomy as treatment for canine degenerative lumbosacral stenosis. Vet Rec 2018; 183:352. [PMID: 30068695 DOI: 10.1136/vr.104741] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 04/23/2018] [Accepted: 07/06/2018] [Indexed: 11/03/2022]
Abstract
Lateral foraminotomy has been described as an effective surgical treatment for foraminal stenosis in the treatment of degenerative lumbosacral stenosis (DLSS) in dogs. Clinical records were reviewed from 45 dogs which had undergone lateral foraminotomy at the lumbosacral junction either alone or in combination with decompressive midline dorsal laminectomy. Short-term outcome at six weeks was assessed by the surgeon to be good (11.1 per cent) or excellent (88.9 per cent) in all 45 cases. Long-term outcome beyond six months for lumbosacral syndrome was assessed by the owner as excellent in all 34 cases for which follow-up was available despite recurrence in five cases. Recurrence of clinical signs was not related to re-establishment of foraminal compression at the surgical site when assessed on repeat MRI and was managed by either contralateral foraminotomy in one case or conservative management with excellent response. This study confirms lateral foraminotomy as an effective procedure in the management of DLSS-affected dogs suffering from foraminal stenosis and demonstrates that initial good short-term results are maintained long term despite some treatable recurrences. Lateral foraminotomy is an effective procedure when used appropriately in DLSS with foraminal stenosis either alone or in combination with midline dorsal laminectomy.
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Affiliation(s)
| | | | - Mike Targett
- School of Veterinary Medicine and Science, University of Nottingham, Loughborough, UK
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15
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Application of MRI for the Diagnosis of Neoplasms. BIOMED RESEARCH INTERNATIONAL 2018; 2018:2715831. [PMID: 29607316 PMCID: PMC5828563 DOI: 10.1155/2018/2715831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 01/15/2018] [Indexed: 11/17/2022]
Abstract
Aim The aim of the study was to determine the most commonly diagnosed neoplasms in the MRI scanned patient population and indicate correlations based on the descriptive variables. Methods The SPSS software was used to determine the incidence of neoplasms within the specific diagnoses based on the descriptive variables of the studied population. Over a five year period, 791 patients and 839 MRI scans were identified in neoplasm category (C00-D48 according to the International Statistical Classification of Diseases and Related Health Problems ICD-10). Results More women (56%) than men (44%) represented C00-D48. Three categories of neoplasms were recorded. Furthermore, benign neoplasms were the most numerous, diagnosed mainly in patients in the fifth decade of life, and included benign neoplasms of the brain and other parts of the central nervous system. Conclusions Males ≤ 30 years of age with neoplasms had three times higher MRI scans rate than females of the same age group; even though females had much higher scans rate in every other category. The young males are more often selected for these scans if a neoplasm is suspected. Finally, the number of MRI-diagnosed neoplasms showed a linear annual increase.
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Jensen RK, Kent P, Jensen TS, Kjaer P. The association between subgroups of MRI findings identified with latent class analysis and low back pain in 40-year-old Danes. BMC Musculoskelet Disord 2018; 19:62. [PMID: 29463258 PMCID: PMC5819254 DOI: 10.1186/s12891-018-1978-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 02/13/2018] [Indexed: 11/10/2022] Open
Abstract
Background Research into the clinical importance of spinal MRI findings in patients with low back pain (LBP) has primarily focused on single imaging findings, such as Modic changes or disc degeneration, and found only weak associations with the presence of pain. However, numerous MRI findings almost always co-exist in the lumbar spine and are often present at more than one lumbar level. It is possible that multiple MRI findings are more strongly associated with LBP than single MRI findings. Latent Class Analysis is a statistical method that has recently been tested and found useful for identifying latent classes (subgroups) of MRI findings within multivariable datasets. The purpose of this study was to investigate the association between subgroups of MRI findings and the presence of LBP in people from the general population. Methods To identify subgroups of lumbar MRI findings with potential clinical relevance, Latent Class Analysis was initially performed on a clinical dataset of 631 patients seeking care for LBP. Subsequently, 412 participants in a general population cohort (the ‘Backs on Funen’ project) were statistically allocated to those existing subgroups by Latent Class Analysis, matching their MRI findings at a segmental level. The subgroups containing MRI findings from the general population were then organised into hypothetical pathways of degeneration and the association between subgroups in the pathways and the presence of LBP was tested using exact logistic regression. Results Six subgroups were identified in the clinical dataset and the data from the general population cohort fitted the subgroups well, with a median posterior probability of 93%–100%. These six subgroups described two pathways of increasing degeneration on upper (L1-L3) and lower (L4-L5) lumbar levels. An association with LBP was found for the subgroups describing severe and multiple degenerative MRI findings at the lower lumbar levels but none of the other subgroups were associated with LBP. Conclusion Although MRI findings are common in asymptomatic people and the association between single MRI findings and LBP is often weak, our results suggest that subgroups of multiple and severe lumbar MRI findings have a stronger association with LBP than those with milder degrees of degeneration. Electronic supplementary material The online version of this article (10.1186/s12891-018-1978-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rikke K Jensen
- Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark. .,Medical Department, Spine Centre of Southern Denmark, Lillebaelt Hospital, Middelfart, Denmark. .,Nordic Institute of Chiropractic and Clinical Biomechanics, Odense, Denmark.
| | - Peter Kent
- Department of Physiotherapy and Exercise Science, Curtin University, Perth, Australia
| | - Tue S Jensen
- Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark.,Medical Department, Spine Centre of Southern Denmark, Lillebaelt Hospital, Middelfart, Denmark.,Nordic Institute of Chiropractic and Clinical Biomechanics, Odense, Denmark.,Department of Diagnostic Imaging, Silkeborg Hospital, Silkeborg, Denmark
| | - Per Kjaer
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
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Hansen BB, Hansen P, Christensen AF, Trampedach C, Rasti Z, Bliddal H, Boesen M. Reliability of standing weight-bearing (0.25T) MR imaging findings and positional changes in the lumbar spine. Skeletal Radiol 2018; 47:25-35. [PMID: 28812185 DOI: 10.1007/s00256-017-2746-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 07/12/2017] [Accepted: 08/01/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To test the reliability and absolute agreement of common degenerative findings in standing positional magnetic resonance imaging (pMRI). METHODS AND MATERIALS Low back pain patients with and without sciatica were consecutively enrolled to undergo a supine and standing pMRI. Three readers independently evaluated the standing pMRI for herniation, spinal stenosis, spondylolisthesis, HIZ lesions and facet joint effusion. The evaluation included a semi-quantitative grading of spinal stenosis, foraminal stenosis and spinal nerve root compression. The standing pMRI images were evaluated with full access to supine MRI. In case lower grades or the degenerative findings were not present in the supine images, this was reported separately as position-dependent changes. A subsample of 20 pMRI examinations was reevaluated after two months. The reproducibility was assessed by inter- and intra-reader reliability (kappa statistic) and absolute agreement between readers. RESULTS Fifty-six patients were included in this study. There was fair-to-substantial inter-reader reliability (κ 0.47 to 0.82) and high absolute agreement (72.3% to 99.1%) for the pMRI findings. The intra-reader assessment showed similar reliability and agreement (κ 0.36 to 0.85; absolute agreement: 62.5% to 98.8%). Positional changes between the supine and standing position showed a fair-to-moderate inter- and intra-reader reliability (κ 0.25 to 0.52; absolute agreement: 97.0% to 99.1). CONCLUSION Evaluation of the lumbar spine for degenerative findings by standing pMRI has acceptable reproducibility; however, positional changes from the supine to the standing position as an independent outcome should be interpreted with caution because of lower reliability, which calls for further standardisation.
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Affiliation(s)
- Bjarke B Hansen
- The Parker Institute, Department of Reumatology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Nordre Fasanvej 57, 2000 F, København Ø, Denmark.
| | - Philip Hansen
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark, Nordre Fasanvej 57-59, Vej 4 indgang 8, 2000 F, København Ø, Denmark
| | - Anders F Christensen
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark, Nordre Fasanvej 57-59, Vej 4 indgang 8, 2000 F, København Ø, Denmark
| | - Charlotte Trampedach
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark, Nordre Fasanvej 57-59, Vej 4 indgang 8, 2000 F, København Ø, Denmark
| | - Zoreh Rasti
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark, Nordre Fasanvej 57-59, Vej 4 indgang 8, 2000 F, København Ø, Denmark
| | - Henning Bliddal
- The Parker Institute, Department of Reumatology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Nordre Fasanvej 57, 2000 F, København Ø, Denmark
| | - Mikael Boesen
- Department of Radiology, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Denmark, Nordre Fasanvej 57-59, Vej 4 indgang 8, 2000 F, København Ø, Denmark
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Preoperative retrolisthesis as a predictive risk factor of reoperation due to delayed-onset symptomatic foraminal stenosis after central decompression for lumbar canal stenosis without fusion. Spine J 2017; 17:1066-1073. [PMID: 28323238 DOI: 10.1016/j.spinee.2017.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 02/18/2017] [Accepted: 03/15/2017] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT For patients diagnosed with lumbar central canal stenosis with asymptomatic foraminal stenosis (FS), surgeons occasionally only decompress central stenosis and preserve asymptomatic FS. These surgeries have the potential risk of converting preoperative asymptomatic FS into symptomatic FS postoperatively by accelerating spinal degeneration, which requires reoperation. However, little is known about delayed-onset symptomatic FS postoperatively. PURPOSE This study aimed to evaluate the rate of reoperation for delayed-onset symptomatic FS after lumbar central canal decompression in patients with preoperative asymptomatic FS, and determine the predictive risk factors of those reoperations. STUDY DESIGN This study is a retrospective cohort study. PATIENT SAMPLE Two hundred eight consecutive patients undergoing posterior central decompression for lumbar canal stenosis between January 2009 and June 2014 were included in this study. OUTCOME MEASURES The number of patients who had preoperative FS and the reoperation rate for delayed-onset symptomatic FS at the index levels were the outcome measures. METHODS Patients were divided into two groups with and without preoperative asymptomatic FS at the decompressed levels. The baseline characteristics and revision rates for delayed-onset symptomatic FS were compared between the two groups. Predictive risk factors for such reoperations were determined using multivariate logistic regression and receiver operating characteristics analyses. RESULTS Preoperatively, 118 patients (56.7%) had asymptomatic FS. Of those, 18 patients (15.3%) underwent reoperation for delayed-onset symptomatic FS at a mean of 1.9 years after the initial surgery. Posterior slip in neutral position and posterior extension-neutral translation were significant risk factors for reoperation due to FS. The optimal cutoff values of posterior slip in neutral position and posterior extension-neutral translation for predicting the occurrence of such reoperations were both 1 mm; 66.7% of patients who met both of these cutoff values had undergone reoperation. CONCLUSIONS This study demonstrated that 15.3% of patients with preoperative asymptomatic FS underwent reoperation for delayed-onset symptomatic FS at the index levels at a mean of 1.9 years after central decompression, and preoperative retrolisthesis was a predictive risk factor for such a reoperation. These findings are valuable for establishing standards of appropriate treatment strategies in patients with lumbar central canal stenosis with asymptomatic FS.
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Lau YYO, Lee RKL, Griffith JF, Chan CLY, Law SW, Kwok KO. Changes in dural sac caliber with standing MRI improve correlation with symptoms of lumbar spinal stenosis. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2017; 26:2666-2675. [DOI: 10.1007/s00586-017-5211-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 07/03/2017] [Indexed: 12/15/2022]
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Postoperative computed tomography and low-field magnetic resonance imaging findings in dogs with degenerative lumbosacral stenosis treated by dorsal laminectomy. Vet Comp Orthop Traumatol 2017; 30:143-152. [PMID: 28094419 DOI: 10.3415/vcot-16-06-0096] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 10/26/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVES To describe postoperative computed tomography (CT) and magnetic resonance imaging (MRI) findings in dogs with degenerative lumbosacral stenosis (DLSS) treated by dorsal laminectomy and partial discectomy. METHODS Prospective clinical case study of dogs diagnosed with and treated for DLSS. Surgical and clinical findings were described. Computed tomography and low field MRI findings pre- and postoperatively were described and graded. Clinical, CT and MRI examinations were performed four to 18 months after surgery. RESULTS Eleven of 13 dogs were clinically improved and two dogs had unchanged clinical status postoperatively despite imaging signs of neural compression. Vacuum phenomenon, spondylosis, sclerosis of the seventh lumbar (L7) and first sacral (S1) vertebrae endplates and lumbosacral intervertebral joint osteoarthritis became more frequent in postoperative CT images. Postoperative MRI showed mild disc extrusions in five cases, and in all cases contrast enhancing non-discal tissue was present. All cases showed contrast enhancement of the L7 spinal nerves both pre- and postoperatively and seven had contrast enhancement of the lumbosacral intervertebral joints and paraspinal tissue postoperatively. Articular process fractures or fissures were noted in four dogs. CLINICAL SIGNIFICANCE The study indicates that imaging signs of neural compression are common after DLSS surgery, even in dogs that have clinical improvement. Contrast enhancement of spinal nerves and soft tissues around the region of disc herniation is common both pre- and postoperatively and thus are unreliable criteria for identifying complications of the DLSS surgery.
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21
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Osteoarthritis year in review 2016: imaging. Osteoarthritis Cartilage 2017; 25:216-226. [PMID: 27965137 DOI: 10.1016/j.joca.2016.12.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 11/21/2016] [Accepted: 12/05/2016] [Indexed: 02/02/2023]
Abstract
PURPOSE The current narrative review covers original research related to imaging in osteoarthritis (OA) in humans published in English between April 1st 2015 and March 31st 2016, in peer reviewed journals available in Medline via PubMed (http://www.ncbi.nlm.nih.gov/pubmed/). METHODS Relevant studies in humans, subjectively decided by the authors, contributing significantly to the OA imaging field, were selected from an extensive Medline search using the terms "Osteoarthritis" in combination with "MRI", "Imaging", "Radiography", "X-rays", "Ultrasound", "Computed tomography", "Nuclear medicine", "PET-CT", "PET-MRI", "Scintigraphy", "SPECT". Publications were sorted according to relevance for the OA imaging research community with an emphasis on high impact special interest journals using the software for systematic reviews www.covidence.org. RESULTS An overview of newly published studies compared to studies reported previous years is presented, followed by a review of selected imaging studies of primarily knee, hip and hand OA focussing on (1) results for detection of OA and OA-related pathology (2) studies dealing with treatments and (3) studies focussing on prognosis of disease progression or joint replacement. A record high number of 1420 articles were published, among others, of new technologies and tools for improved morphological and pathophysiological understanding of OA-related changes in joints. Also, imaging data were presented of monitoring treatment effect and prognosis of OA progression, primarily using established radiographic, magnetic resonance imaging (MRI), and ultrasound (US) methods. CONCLUSION Imaging continues to play an important role in OA research, where several exciting new technologies and computer aided analysis methods are emerging to complement the conventional imaging approaches.
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22
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Law SW, Szeto GPY, Chau WW, Chan C, Kwok AWL, Lai HS, Lee RKL, Griffith JF, Hung LK, Cheng JCY. Multi-disciplinary Orthopaedics Rehabilitation Empowerment (MORE) program: A new standard of care for injured workers in Hong Kong. J Back Musculoskelet Rehabil 2016; 29:503-13. [PMID: 26836833 DOI: 10.3233/bmr-150650] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND The objective of this study is to evaluate the effects of the Multi-disciplinary Orthopaedics Rehabilitation Empowerment (MORE) Program on reducing chronic disability among injured workers and improving efficiency of work rehabilitation process. METHODS A cohort of patients with workplace injuries in the lower back were recruited from orthopaedics clinics and assigned to either MORE group (n= 139) or control group (n= 106). Patients in MORE group received an early MRI screening and a coordinated multi-disciplinary management, while patients in the control group received conventional care. Outcome variables are time to return-to-work (RTW) from date of injury, waiting time for MRI screening and time to medical assessment board (MAB). RESULTS Patients in the MORE Program had significantly shorter duration for RTW (MORE: 6.1 months, CONTROL 12.8 months, p< 0.01), and more RTW cases (n= 64, 46.0%) compared to CONTROL group (n= 29, 27.4%). The MORE group also had much shorter waiting time for MRI scans (91.85 vs. 309.2 days, p< 0.001) and MAB referral after MRI scans (97.2 vs. 178.9 days, p= 0.001) compared to CONTROL group. CONCLUSIONS The MORE Program which emphasizes early intervention and early MRI screening, is shown to be effective in shortening sick leave and improving RTW outcomes of injured workers.
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Affiliation(s)
- S W Law
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - G P Y Szeto
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong, China
| | - W W Chau
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - Carol Chan
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - Anthony W L Kwok
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - H S Lai
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong, China.,Total Rehabilitation Management (Hong Kong) Limited, Hong Kong, China
| | - Ryan K L Lee
- Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong, China
| | - James F Griffith
- Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong, China
| | - L K Hung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - J C Y Cheng
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, China
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Hansen BB, Hansen P, Carrino JA, Fournier G, Rasti Z, Boesen M. Imaging in mechanical back pain: Anything new? Best Pract Res Clin Rheumatol 2016; 30:766-785. [DOI: 10.1016/j.berh.2016.08.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 06/21/2016] [Accepted: 08/04/2016] [Indexed: 12/13/2022]
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