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Knee MR image

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https://www.readbyqxmd.com/read/28894908/discoid-lateral-meniscus-can-be-overlooked-by-magnetic-resonance-imaging-in-patients-with-meniscal-tears
#1
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
#2
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...
September 6, 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
#3
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...
September 8, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28833914/patellofemoral-and-tibiofemoral-alignment-in-a-fully-weight-bearing-upright-mr-implementation-and-repeatability
#4
Erin M Macri, Kay M Crossley, Agnes G d'Entremont, Harvi F Hart, Bruce B Forster, David R Wilson, Charles R Ratzlaff, Anne M Walsh, Karim M Khan
PURPOSE: To develop methods for evaluating 3D patellofemoral and tibiofemoral alignment in vertical open-bore magnetic resonance (MR) scanners, with participants upright and fully weight-bearing; and to evaluate the repeatability of these methods in individuals with patellofemoral osteoarthritis (OA) and in asymptomatic knees. MATERIALS AND METHODS: Our methods extend previously validated, reliable methods for evaluating alignment into an upright MR environment...
August 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28833609/magnetic-resonance-imaging-of-the-tensor-vastus-intermedius-a-topographic-study-based-on-anatomical-dissections
#5
K Grob, M Manestar, D Gascho, T Ackland, H Gilbey, Kuster, Ch Fretz
The tensor of the vastus intermedius (TVI) is a newly described component of the extensor apparatus of the knee joint. The objective of this study was to evaluate the appearance of the TVI on magnetic resonance (MR) imaging and its association with the adjacent vastus lateralis (VL) and vastus intermedius (VI) muscles and to compare these findings with the corresponding anatomy. MR images were analyzed from a cadaveric thigh where the TVI, as part of the extensor apparatus of the knee joint, had been dissected...
August 17, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28828623/efficacy-of-double-inversion-recovery-magnetic-resonance-imaging-for-the-evaluation-of-the-synovium-in-the-femoro-patellar-joint-without-contrast-enhancement
#6
Ye Na Son, Wook Jin, Geon-Ho Jahng, Jang Gyu Cha, Yong Sung Park, Seong Jong Yun, So Young Park, Ji Seon Park, Kyung Nam Ryu
OBJECTIVE: To investigate the efficacy of double inversion recovery (DIR) sequence for evaluating the synovium of the femoro-patellar joint without contrast enhancement (CE). METHODS: Two radiologists independently evaluated the axial DIR and CE T1-weighted fat-saturated (CET1FS) images of 33 knees for agreement; the visualisation and distribution of the synovium were evaluated using a four-point visual scaling system at each of the five levels of the femoro-patellar joint and the location of the thickest synovium...
August 21, 2017: European Radiology
https://www.readbyqxmd.com/read/28825890/case-245-erdheim-chester-disease
#7
Mark D Mamlouk, Mariam S Aboian, Christine M Glastonbury
History A 53-year-old man experienced headache and double vision that progressed over 1 year. After a traumatic fall, he was hospitalized, and proptosis was identified at physical examination. Laboratory tests were remarkable for leukocytosis. Hematocrit level, thyroid stimulating hormone level, autoimmune antibody level, erythrocyte sedimentation rate, and C-reactive protein level were normal. Computed tomography (CT) of the head revealed bilateral intraconal masses, for which magnetic resonance (MR) imaging of the orbits was subsequently performed ( Fig 1 )...
September 2017: Radiology
https://www.readbyqxmd.com/read/28822094/quantitative-knee-cartilage-measurement-at-mr-imaging-of-patients-with-anterior-cruciate-ligament-tear
#8
Kazuki Kato, Tamotsu Kamishima, Eiji Kondo, Tomohiro Onodera, Shota Ichikawa
In previous studies, numerous approaches were proposed that assess knee cartilage volume quantitatively using 3D magnetic resonance (MR) imaging. However, the clinical use of these approaches is limited because 3D MR is prone to metal artifacts in postoperative cases. Our purpose in this study was to validate a method for knee cartilage volume quantification using conventional MR imaging in patients who underwent anterior cruciate ligament (ACL) reconstruction surgery. The study included 16 patients who underwent MR imaging before and 1 year after ACL reconstruction surgery...
August 18, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28801826/brain-activity-changes-in-somatosensory-and-emotion-related-areas-with-medial-patellofemoral-ligament-deficiency
#9
Masaru Kadowaki, Taku Tadenuma, Nobuyuki Kumahashi, Yuji Uchio
BACKGROUND: Patellar instability with medial patellofemoral ligament (MPFL) deficiency is a common sports injury among young people. Although nonoperative and surgical treatment can provide stability of the patella, patients often have anxiety related to the knee. We speculate that neural dysfunction may be related to anxiety in these patients; however, the mechanism in the brain that generates this anxiety remains unknown. QUESTIONS/PURPOSES: (1) How does brain activity in patients with MPFL deficiency change in the areas related to somatic sensation against lateral shift of the patella? (2) How does patella instability, which can lead to continuous fear or apprehension for dislocation, influence brain activity in the areas related to emotion? METHODS: Nineteen patients with MPFL deficiency underwent surgical reconstruction in our hospital from April 2012 to March 2014...
August 11, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28777663/frondlike-synovitis-on-mri-and-correlation-with-polyethylene-surface-damage-of-total-knee-arthroplasty
#10
Angela E Li, Christine C Johnson, Darryl B Sneag, Chelsea N Koch, Kara Fields, Theodore T Miller, Timothy M Wright, Douglas E Padgett, Hollis G Potter
OBJECTIVE: The purpose of this study is to determine the association between polyethylene surface damage and the severity of frondlike hypertrophied synovitis, joint distention, capsular thickness, and osteolysis on MRI compared with other patient factors. Another goal of this study is to ascertain the interobserver reliability in MRI evaluation of synovitis. MATERIALS AND METHODS: MR images of 61 patients who had undergone revision total knee arthroplasty (TKA) were retrospectively reviewed...
August 4, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28756566/pten-hamartoma-of-the-soft-tissue-the-initial-manifestation-of-an-underlying-pten-hamartoma-tumor-syndrome-in-a-4-year-old-female
#11
Charles B Chism, Lindsay Crawford, Amanda Tchakarov, Alyaa Al-Ibraheemi, Nicholas M Beckmann
A 4-year-old female was referred to pediatric orthopedic surgery for left leg pain and limping for 3 months following a motor vehicle collision. Recently, the patient's mother had noted left knee swelling and dragging of the left leg when walking. Past medical history was significant for hip dysplasia with slight leg length discrepancy. The patient was otherwise healthy. Physical examination was remarkable for left pre-patellar soft tissue fullness with normal range of motion. There was no warmth or tenderness...
July 29, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28733975/deep-convolutional-neural-network-and-3d-deformable-approach-for-tissue-segmentation-in-musculoskeletal-magnetic-resonance-imaging
#12
Fang Liu, Zhaoye Zhou, Hyungseok Jang, Alexey Samsonov, Gengyan Zhao, Richard Kijowski
PURPOSE: To describe and evaluate a new fully automated musculoskeletal tissue segmentation method using deep convolutional neural network (CNN) and three-dimensional (3D) simplex deformable modeling to improve the accuracy and efficiency of cartilage and bone segmentation within the knee joint. METHODS: A fully automated segmentation pipeline was built by combining a semantic segmentation CNN and 3D simplex deformable modeling. A CNN technique called SegNet was applied as the core of the segmentation method to perform high resolution pixel-wise multi-class tissue classification...
July 21, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28716681/mri-magic-angle-effect-in-femorotibial-cartilages-of-the-red-kangaroo
#13
Tonima S Ali, Namal Thibbotuwawa, YuanTong Gu, Konstantin I Momot
OBJECTIVE: Kangaroo knee cartilages are robust tissues that can support knee flexion and endure high levels of compressive stress. This study aimed to develop a detailed understanding of the collagen architecture in kangaroo knee cartilages and thus obtain insights into the biophysical basis of their function. DESIGN: Cylindrical/square plugs from femoral and tibial hyaline cartilage and tibial fibrocartilage were excised from the knees of three adult red kangaroos...
July 15, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28711767/fully-automated-subchondral-bone-segmentation-from-knee-mr-images-data-from-the-osteoarthritis-initiative
#14
Akash Gandhamal, Sanjay Talbar, Suhas Gajre, Ruslan Razak, Ahmad Fadzil M Hani, Dileep Kumar
Knee osteoarthritis (OA) progression can be monitored by measuring changes in the subchondral bone structure such as area and shape from MR images as an imaging biomarker. However, measurements of these minute changes are highly dependent on the accurate segmentation of bone tissue from MR images and it is challenging task due to the complex tissue structure and inadequate image contrast/brightness. In this paper, a fully automated method for segmenting subchondral bone from knee MR images is proposed. Here, the contrast of knee MR images is enhanced using a gray-level S-curve transformation followed by automatic seed point detection using a three-dimensional multi-edge overlapping technique...
September 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28710543/acute-non-contact-anterior-cruciate-ligament-tears-are-associated-with-relatively-increased-vastus-medialis-to-semimembranosus-cross-sectional-area-ratio-a-case-control-retrospective-mr-study
#15
Ged G Wieschhoff, Jacob C Mandell, Gregory J Czuczman, Violeta Nikac, Nehal Shah, Stacy E Smith
OBJECTIVE: Hamstring muscle deficiency is increasingly recognized as a risk factor for anterior cruciate ligament (ACL) tears. The purpose of this study is to evaluate the vastus medialis to semimembranosus cross-sectional area (VM:SM CSA) ratio on magnetic resonance imaging (MRI) in patients with ACL tears compared to controls. MATERIALS AND METHODS: One hundred knee MRIs of acute ACL tear patients and 100 age-, sex-, and side-matched controls were included. Mechanism of injury, contact versus non-contact, was determined for each ACL tear subject...
July 15, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28685238/functional-in-situ-assessment-of-human-articular-cartilage-using-mri-a-whole-knee-joint-loading-device
#16
Sven Nebelung, Manuel Post, Stefan Raith, Horst Fischer, Matthias Knobe, Benedikt Braun, Andreas Prescher, Markus Tingart, Johannes Thüring, Philipp Bruners, Holger Jahr, Christiane Kuhl, Daniel Truhn
The response to loading of human articular cartilage as assessed by magnetic resonance imaging (MRI) remains to be defined in relation to histology and biomechanics. Therefore, an MRI-compatible whole-knee joint loading device for the functional in situ assessment of cartilage was developed and validated in this study. A formalin-fixed human knee was scanned by computed tomography in its native configuration and digitally processed to create femoral and tibial bone models. The bone models were covered by artificial femoral and tibial articular cartilage layers in their native configuration using cartilage-mimicking polyvinyl siloxane...
July 6, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28677057/forensic-age-estimation-by-magnetic-resonance-imaging-of-the-knee-the-definite-relevance-in-bony-fusion-of-the-distal-femoral-and-the-proximal-tibial-epiphyses-using-closest-to-bone-t1-tse-sequence
#17
Christian Ottow, Ronald Schulz, Heidi Pfeiffer, Walter Heindel, Andreas Schmeling, Volker Vieth
OBJECTIVES: To clarify the relevance of the bony fusion of the distal femoral and the proximal tibial epiphyses by means of magnetic resonance imaging (MRI), a prospective cross-sectional cohort study was performed with a special focus on a reliable determination of the 14th, 16th and 18th years of life. METHODS: We scanned 658 German volunteers in the age bracket 12-24 years using a 3.0 T MR-scanner and utilising a T1 turbo spin-echo sequence representing true bone anatomy...
July 4, 2017: European Radiology
https://www.readbyqxmd.com/read/28668413/comparison-of-3d-bone-models-of-the-knee-joint-derived-from-ct-and-3t-mr-imaging
#18
Aleš Neubert, Katharine J Wilson, Craig Engstrom, Rachel K Surowiec, Anthony Paproki, Nicholas Johnson, Stuart Crozier, Jurgen Fripp, Charles P Ho
PURPOSE: To examine whether magnetic resonance (MR) imaging can offer a viable alternative to computed tomography (CT) based 3D bone modeling. METHODS: CT and MR (SPACE, TrueFISP, VIBE) images were acquired from the left knee joint of a fresh-frozen cadaver. The distal femur, proximal tibia, proximal fibula and patella were manually segmented from the MR and CT examinations. The MR bone models obtained from manual segmentations of all three sequences were compared to CT models using a similarity measure based on absolute mesh differences...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28660404/isolated-peroneal-tenosynovial-lipoma-arborescens-multimodality-imaging-features
#19
Wilbur Wang, Dorota D Linda, Evelyne Fliszar, Anna A Kulidjian, Brady K Huang
Synovial lipoma arborescens is a rare and benign fatty proliferative lesion of the synovium that is most commonly seen within the suprapatellar pouch of the knee, but increasingly reported to involve tendon sheaths, including those of the ankle. We present the third known case of tenosynovial lipoma arborescens isolated to the peroneal tendon sheath without ankle joint involvement. To our knowledge, this is the first to report this entity utilizing a unique combination of radiographic, sonographic, and MR imaging, along with intraoperative and histologic correlation...
June 28, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28651649/relationship-between-knee-osteoarthritis-and-meniscal-shape-in-observation-of-japanese-patients-by-using-magnetic-resonance-imaging
#20
Tsuneo Kawahara, Takahisa Sasho, Joe Katsuragi, Takashi Ohnishi, Hideaki Haneishi
BACKGROUND: The aims of this study were to reveal the characteristics of the meniscal shape at each knee osteoarthritis (OA) severity level and to predict trends or patterns of the meniscal shape change as associated with knee OA progression. METHODS: Fifty-one patients diagnosed with knee OA based on X-ray and magnetic resonance (MR) images were evaluated. They were divided into three groups based on the Kellgren-Lawrence (KL) grade: normal group (KL grade of 0 or 1), mild group (KL grade of 2 or 3), and severe group (KL grade of 4)...
June 26, 2017: Journal of Orthopaedic Surgery and Research
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