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https://www.readbyqxmd.com/read/29329471/diagnosing-meniscal-pathology-and-understanding-how-to-evaluate-a-postoperative-meniscus-based-on-the-operative-procedure
#1
Monica Tafur, Linda Probyn, Jaskarndip Chahal, Lawrence M White
Magnetic resonance imaging (MRI) represents the preferred noninvasive imaging technique to diagnose meniscal pathology in the pre- and postoperative setting. Furthermore, characterization of meniscal tissue MR properties has been possible by the development of advanced MRI techniques. Suspected meniscal tears are a frequent indication for MRI and the International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine (ISAKOS) classification system has been developed to facilitate accurate and uniform reporting of such meniscal tears...
January 12, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29250856/simultaneous-bilateral-knee-mr-imaging
#2
Feliks Kogan, Evan Levine, Akshay S Chaudhari, Uchechukwuka D Monu, Kevin Epperson, Edwin H G Oei, Garry E Gold, Brian A Hargreaves
PURPOSE: To demonstrate and evaluate the scan time and quantitative accuracy of simultaneous bilateral-knee imaging compared with single-knee acquisitions. METHODS: Hardware modifications and safety testing was performed to enable MR imaging with two 16-channel flexible coil arrays. Noise covariance and sensitivity-encoding g-factor maps for the dual-coil-array configuration were computed to evaluate coil cross-talk and noise amplification. Ten healthy volunteers were imaged on a 3T MRI scanner with both dual-coil-array bilateral-knee and single-coil-array single-knee configurations...
December 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29226423/patellar-tendinopathy-with-intra-tendinous-alteration-on-mri-may-be-related-to-patellofemoral-dysplasia
#3
Philippe M Tscholl, Roland M Biedert, Florian Wanivenhaus, Sandro F Fucentese
Patellar tendinopathy (PT) is a frequent overuse-injury of the extensor knee apparatus whereas as up to 30% of the athletes might suffer from persisting symptoms during their entire career. In the present case-control study, 47 patients (30.8±11.4 years) with PT with intra-tendinous alteration (PTita) of a minimum of ≥ 25% of the axial surface on MRI and minimum Blazina score of II (pain during without limiting sports activity) were included; MR images were analysed for trochlear geometry, patellar height/tilt, and tibial tubercle trochlear groove distance (TT-TG)...
December 11, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29221902/a-comparison-of-patellofemoral-cartilage-morphology-and-deformation-in-anterior-cruciate-ligament-deficient-versus-uninjured-knees
#4
Kwadwo A Owusu-Akyaw, Lauren N Heckelman, Hattie C Cutcliffe, E Grant Sutter, Zoë A Englander, Charles E Spritzer, William E Garrett, Louis E DeFrate
Anterior cruciate ligament (ACL) deficient patients have an increased rate of patellofemoral joint (PFJ) osteoarthritis (OA) as compared to the general population. Although the cause of post-injury OA is multi-factorial, alterations in joint biomechanics may predispose patients to cartilage degeneration. This study aimed to compare in vivo PFJ morphology and mechanics between ACL deficient and intact knees in subjects with unilateral ACL ruptures. Eight male subjects underwent baseline MRI scans of both knees...
November 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29208323/evaluation-of-posterior-cruciate-ligament-and-intercondylar-notch-in-subjects-with-anterior-cruciate-ligament-tear-a-comparative-flexed-knee-3d-magnetic-resonance-imaging-study
#5
Atul K Taneja, Frederico C Miranda, Marco K Demange, Marcelo P Prado, Durval C B Santos, Laercio A Rosemberg, Ronaldo H Baroni
PURPOSE: To determine if posterior cruciate ligament (PCL) and intercondylar notch (IN) morphometries and volumetrics act as risk factors for anterior cruciate ligament (ACL) tears. METHODS: A prospective case-controlled magnetic resonance imaging (MRI) study was conducted with subjects presenting noncontact knee injuries. Exclusion criteria were previous surgery, PCL tear, osteoarthritis, tumors, or infectious and inflammatory conditions. All participants underwent a flexed-knee 3-dimensional (3D) magnetic resonance imaging (MRI) to uniformly straighten PCL...
December 2, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29202550/the-normal-value-of-tibial-tubercle-trochlear-groove-distance-in-patients-with-normal-knee-examinations-using-mri
#6
Mohammad Sobhanardekani, Mohammad Reza Sobhan, Reza Nafisi Moghadam, Sepehr Nabavinejad, Seid Kazem Razavi Ratki
Patellar instability is a multifactorial common knee pathology that has a high recurrence rate, and the symptoms continue and ultimately predispose the patient to chondromalacia and osteoarthritis. Tibial tuberosity-trochlear groove distance (TTTG) is very important in the assessment of patellofemoral joint instability. The purpose of this study was to report the normal value of TTTG in males and females in different age groups and to assess the reliability of MRI in measuring TTTG. All patients presenting with knee pain and normal examinations of the knee joint, with a normal MRI report, referring to Shahid Sadoughi hospital of Yazd, Iran, from April 2014 to September 2014, were included in the study...
September 2017: Acta Medica Iranica
https://www.readbyqxmd.com/read/29198819/a-day-in-the-life-of-mri-the-variety-and-appropriateness-of-exams-being-performed-in-canada
#7
Sonia Vanderby, Andreea Badea, Juan Nicolás Peña Sánchez, Neil Kalra, Paul Babyn
PURPOSE: This study aimed to determine the volumes and types of magnetic resonance imaging exams being performed across Canada, common indications for the exams, and exam appropriateness using multiple evaluation tools. METHODS: Thirteen academic medical institutions across Canada participated. Data were obtained relating to a single common day, October 1, 2014. Patient demographics, type by anatomic region and indication for imaging were analysed. Each exam was assessed for appropriateness via the Canadian Association of Radiologists Referral Guidelines and the American College of Radiology Appropriateness Criteria...
November 30, 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/29143404/tool-for-osteoarthritis-risk-prediction-toarp-over-8-years-using-baseline-clinical-data-x-ray-and-mri-data-from-the-osteoarthritis-initiative
#8
Gabby B Joseph, Charles E McCulloch, Michael C Nevitt, Jan Neumann, Alexandra S Gersing, Martin Kretzschmar, Benedikt J Schwaiger, John A Lynch, Ursula Heilmeier, Nancy E Lane, Thomas M Link
BACKGROUND: Osteoarthritis (OA), a multifactorial disease causing joint degeneration, often leads to severe disability. The rising rates of disability highlight the need for implementing preventative measures at early stages of the disease, which would especially benefit subjects at high risk for OA development. PURPOSE: To develop a risk prediction tool for moderate-severe OA (TOARP) over 8 years based on subject characteristics, knee radiographs, and MRI data at baseline using data from the Osteoarthritis Initiative (OAI)...
November 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29125920/frontal-plane-knee-mechanics-and-early-cartilage-degeneration-in-people-with-anterior-cruciate-ligament-reconstruction-a-longitudinal-study
#9
Deepak Kumar, Favian Su, Daniel Wu, Valentina Pedoia, Lauren Heitkamp, C Benjamin Ma, Richard B Souza, Xiaojuan Li
BACKGROUND: Abnormal frontal plane gait mechanics are known risk factors for knee osteoarthritis, but their role in early cartilage degeneration after anterior cruciate ligament reconstruction (ACLR) is not well understood. Hypothesis/Purpose: The objective was to evaluate the association of frontal plane gait mechanics with medial knee cartilage magnetic resonance (MR) relaxation times over 1 year in patients with ACLR and controls. It was hypothesized that (1) there will be an increase in frontal plane medial knee loading and medial knee MR relaxation times over time in the patients with ACLR, and (2) increases in frontal plane medial knee loading will be associated with an increase in medial knee MR relaxation times...
November 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29115689/learning-a-variational-network-for-reconstruction-of-accelerated-mri-data
#10
Kerstin Hammernik, Teresa Klatzer, Erich Kobler, Michael P Recht, Daniel K Sodickson, Thomas Pock, Florian Knoll
PURPOSE: To allow fast and high-quality reconstruction of clinical accelerated multi-coil MR data by learning a variational network that combines the mathematical structure of variational models with deep learning. THEORY AND METHODS: Generalized compressed sensing reconstruction formulated as a variational model is embedded in an unrolled gradient descent scheme. All parameters of this formulation, including the prior model defined by filter kernels and activation functions as well as the data term weights, are learned during an offline training procedure...
November 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29106743/quantifying-meniscal-kinematics-in-dogs
#11
Brian H Park, Scott A Banks, Antonio Pozzi
The dog has been used extensively as an experimental model to study meniscal treatments such as meniscectomy, meniscal repair, transplantation and regeneration. However, there is very little information on meniscal kinematics in the dog. This study used MR imaging to quantify in vitro meniscal kinematics in loaded dog knees in four distinct poses: extension, flexion, internal and external rotation. A new method was used to track the meniscal poses along the convex and posteriorly tilted tibial plateau. Meniscal displacements were large, displacing 13...
November 6, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29103976/accelerating-knee-mr-imaging-compressed-sensing-in-isotropic-three-dimensional-fast-spin-echo-sequence
#12
Seung Hyun Lee, Young Han Lee, Jin-Suck Suh
PURPOSE: To compare image quality between compressed sensing (CS)-3D-fast spin-echo (FSE) and conventional 3D-FSE sequences for knee magnetic resonance imaging (MRI). METHODS: Knee MRI of 43 patients (male:female, 14:29; mean age, 53years) were acquired using conventional and CS-3D-FSE with an acceleration factor of 1.5. Overall image quality was assessed by correlation coefficient, root-mean-square error (RMSE), and structural similarity (SSIM) index. Regional image quality was evaluated using signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs)...
November 15, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29103482/quantitative-evaluation-of-knee-cartilage-and-meniscus-destruction-in-patients-with-rheumatoid-arthritis-using-t1%C3%AF-and-t2-mapping
#13
Xiang Hong Meng, Zhi Wang, Li Guo, Xiu Chan Liu, Yu Wei Zhang, Ze Wei Zhang, Xin Long Ma
OBJECTIVE: To calculate T1ρ and T2 values of articular cartilage and menisci in knee joints of patients with RA, and compare the values between RA patients and healthy volunteers, to gain insight into the pathogenesis of cartilage and meniscus degradation in patients with RA. MATERIALS AND METHODS: Nine patients with RA and knee joints symptoms were enrolled in the study, twenty healthy volunteers without knee joint diseases were included as controls. Sagittal fat-saturated T1ρ and T2 mapping images were obtained on a 3T MR scanner (GE750, GE Healthcare, Waukesha, WI), using a dedicated 8-channel knee coil...
November 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29091749/the-protein-corona-around-nanoparticles-facilitates-stem-cell-labeling-for-clinical-mr-imaging
#14
Hossein Nejadnik, Seyed-Meghdad Taghavi-Garmestani, Steven J Madsen, Kai Li, Saeid Zanganeh, Phillip Yang, Morteza Mahmoudi, Heike E Daldrup-Link
Purpose To evaluate if the formation of a protein corona around ferumoxytol nanoparticles can facilitate stem cell labeling for in vivo tracking with magnetic resonance (MR) imaging. Materials and Methods Ferumoxytol was incubated in media containing human serum (group 1), fetal bovine serum (group 2), StemPro medium (group 3), protamine (group 4), and protamine plus heparin (group 5). Formation of a protein corona was characterized by means of dynamic light scattering, ζ potential, and liquid chromatography-mass spectrometry...
November 1, 2017: Radiology
https://www.readbyqxmd.com/read/29045182/validity-of-radiograph-based-infrapatellar-fat-pad-opacity-grading-for-assessing-knee-synovitis-correlation-with-contrast-enhanced-mri
#15
Seong Jong Yun, Youngsik Lim, Wook Jin, Yong Sung Park, Sun Hwa Lee, Kyung Nam Ryu
OBJECTIVE: The purpose of this study was to determine the validity of infrapatellar fat pad (IPFP) opacity grading based on lateral knee radiography for assessing knee synovitis using correlation with contrast-enhanced (CE) MRI. MATERIALS AND METHODS: Retrospective reviews of radiographs and CE knee MR images from 79 patients were independently performed by two radiologists. They evaluated IPFP opacity alteration (IPFPCR) and joint effusion grades on lateral knee conventional radiographs, IPFP signal intensity alteration (IPFPMR) and joint effusion grades on CE MR images, and synovitis (SYNMR) grade in nine divided regions, three compartments (parapatellar, periligamentous, perimeniscal), and the whole knee on CE MR images...
December 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29031987/intra-articular-injection-of-mesenchymal-stem-cells-and-platelet-rich-plasma-to-treat-patellofemoral-osteoarthritis-preliminary-results-of-a-long-term-pilot-study
#16
Julien Pintat, Alain Silvestre, Guy Magalon, Alain Pierre Gadeau, Lionel Pesquer, Anne Perozziello, Alain Peuchant, Charbel Mounayer, Benjamin Dallaudière
PURPOSE: To assess the feasibility and safety of concomitant intra-articular (IA) knee injection of mesenchymal stem cells (MSCs) and platelet-rich plasma (PRP) under fluoroscopic guidance to treat patellofemoral osteoarthritis (OA). MATERIALS AND METHODS: This prospective study included 19 consecutive patients referred for fluoroscopically guided IA MSC and PRP injection for symptomatic patellofemoral chondropathy in which conservative treatment had failed. Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score and magnetic resonance (MR) data, including T2 mapping sequence, were prospectively collected before and 6 months after treatment...
December 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28943164/rare-stress-fracture-longitudinal-fracture-of-the-femur
#17
M Pérez González, P Velázquez Fragua, E López Miralles, M M Abad Moretón
42-year-old man with pain in the posterolateral region of the right knee that began while he was running. Initially, it was diagnosed by magnetic resonance (MR) as a possible aggressive process (osteosarcoma or Ewing's sarcoma) but with computed tomography it was noted a cortical hypodense linear longitudinal image with a continuous, homogeneous and solid periosteal reaction without clear soft tissue mass that in this patient suggest a longitudinal distal femoral fatigue stress fracture. This type of fracture at this location is very rare...
September 21, 2017: Radiología
https://www.readbyqxmd.com/read/28894908/discoid-lateral-meniscus-can-be-overlooked-by-magnetic-resonance-imaging-in-patients-with-meniscal-tears
#18
Dong-Wook Sohn, Seong-Il Bin, Jong-Min Kim, Bum-Sik Lee, Seon-Jeong Kim
PURPOSE: MRI evaluation of torn lateral meniscus was compared with arthroscopy. This study calculates the sensitivity, specificity, and accuracy of MRI in determining the presence or absence of discoid lateral meniscus (DLM) for different tear types. METHODS: MR imaging of 156 knees with arthroscopically confirmed lateral meniscus tears was analysed. There were 78 knees (70 patients) in non-DLM group and 78 knees (74 patients) in DLM group on arthroscopy as the reference standard...
September 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28888741/magnetic-resonance-signal-abnormalities-within-the-pericruciate-fat-pad-a-possible-secondary-sign-for-acute-anterior-cruciate-ligament-tears
#19
Ferdinando Draghi, Mario Torresi, Luigi Urciuoli, Salvatore Gitto
PURPOSE: The study sought to investigate the presence of magnetic resonance (MR) signal alterations within the pericruciate fat pad in patients with an acute anterior cruciate ligament (ACL) tear as well as evaluate its diagnostic value in comparison with the main secondary signs of ACL tears. METHODS: Two musculoskeletal radiologists retrospectively reviewed knee MR examinations performed from May to October 2015. The ACL was considered as torn or intact based on either previous arthroscopic findings or unequivocal MR imaging interpretation if arthroscopic correlation was unavailable...
November 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/28885742/adaptive-bulk-motion-exclusion-for-improved-robustness-of-abdominal-magnetic-resonance-imaging
#20
Bjorn Stemkens, Thomas Benkert, Hersh Chandarana, Mark E Bittman, Cornelis A T Van den Berg, Jan J W Lagendijk, Daniel K Sodickson, Rob H N Tijssen, Kai Tobias Block
Non-Cartesian magnetic resonance imaging (MRI) sequences have shown great promise for abdominal examination during free breathing, but break down in the presence of bulk patient motion (i.e. voluntary or involuntary patient movement resulting in translation, rotation or elastic deformations of the body). This work describes a data-consistency-driven image stabilization technique that detects and excludes bulk movements during data acquisition. Bulk motion is identified from changes in the signal intensity distribution across different elements of a multi-channel receive coil array...
November 2017: NMR in Biomedicine
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